GREAT LAKES ENVIRONMENTAL RESEARCH LABORATORY, NOAA Climate Data Modernization Project National Weather Service Historical Great Lakes Ice Reports for Winters 1899 - 1970 Site No. 228, Approximate Location: 45.81 N. Latitude, 84.72 W. Longitude Site Name Straits of Mackinac on Lake Michigan ---------------------------------------------------------------------------------------------------------- Year Mo Da T1 T2 C1 T1C1 T2C1 C2 T1C2 T2C2 C3 T1C3 T2C3 IMAGE Supplemental Information ---------------------------------------------------------------------------------------------------------- 1899 4 8 -1 -1 SO -1 -1 RT -1 -1 -1 -1 529.TIF 1899 4 11 36 48 -1 -1 -1 -1 -1 -1 529.TIF 1900 2 27 20 -1 SO -1 -1 -1 -1 -1 -1 003.TIF 1900 3 13 20 -1 NC -1 -1 -1 -1 -1 -1 005.TIF 1900 3 20 -1 -1 SO -1 -1 -1 -1 -1 -1 006.TIF 1900 3 27 -1 -1 SO -1 -1 NC -1 -1 -1 -1 007.TIF 1900 4 9 -1 -1 SO -1 -1 RT -1 -1 -1 -1 009.TIF 1901 4 2 12 -1 RT -1 -1 -1 -1 -1 -1 015.TIF CHEBOYGAN 1902 3 4 -1 -1 WI -1 -1 -1 -1 -1 -1 019.TIF 1902 3 27 -1 -1 BK -1 -1 -1 -1 -1 -1 023.TIF 1903 3 17 -1 -1 LF -1 -1 RT -1 -1 -1 -1 026.TIF 1904 4 26 -1 -1 RI -1 -1 -1 -1 -1 -1 037.TIF 1907 3 5 12 18 SO -1 -1 -1 -1 -1 -1 051.TIF BOIS BLANC ISL. TO L. MICHIGAN 1907 3 5 -1 -1 OW -1 -1 -1 -1 -1 -1 051.TIF EAST OF BOIS BLANC ISLAND 1907 3 26 -1 -1 BK -1 -1 -1 -1 -1 -1 054.TIF 1907 4 2 -1 -1 IP -1 -1 -1 -1 -1 -1 055.TIF 1907 4 9 -1 -1 LI -1 -1 -1 -1 -1 -1 056.TIF 1908 3 3 20 -1 SO -1 -1 SC -1 -1 -1 -1 057.TIF 1908 3 17 12 -1 SO -1 -1 -1 -1 -1 -1 059.TIF 1908 4 14 -1 -1 DC -1 -1 -1 -1 -1 -1 062.TIF 1908 4 21 -1 -1 IP -1 -1 -1 -1 -1 -1 063.TIF WEST END OF STRAITS 1908 4 21 -1 -1 OW -1 -1 -1 -1 -1 -1 063.TIF EAST END OF STRAITS 1909 3 2 -1 -1 WI -1 -1 -1 -1 -1 -1 064.TIF 1909 3 9 20 -1 NC -1 -1 -1 -1 -1 -1 065.TIF 1909 3 30 20 -1 -1 -1 -1 -1 -1 -1 068.TIF 1909 4 6 12 -1 RT -1 -1 -1 -1 -1 -1 069.TIF 1910 4 5 -1 -1 OW -1 -1 -1 -1 -1 -1 076.TIF 1911 3 28 -1 -1 OW -1 -1 -1 -1 -1 -1 080.TIF CHEBOYGAN TO POINT AUX PINS 1911 3 28 -1 -1 OW -1 -1 -1 -1 -1 -1 080.TIF MACKINAW CITY TO MACKINAC ISL. 1911 3 28 -1 -1 OW -1 -1 -1 -1 -1 -1 080.TIF MACKINAW CITY TO ST. IGNACE 1911 3 28 -1 -1 OW -1 -1 -1 -1 -1 -1 080.TIF TO 4Mi WEST OF MACKINAW CITY 1914 4 7 -1 -1 SO -1 -1 -1 -1 -1 -1 103.TIF BOTH ENDS OF THE STRAITS 1915 3 30 -1 -1 IP -1 -1 -1 -1 -1 -1 109.TIF WEST END OF STRAITS 1915 4 20 -1 -1 OW -1 -1 -1 -1 -1 -1 112.TIF 1917 4 24 -1 -1 OW -1 -1 -1 -1 -1 -1 127.TIF CHEBOYGAN TO PORT HURON 1917 4 24 -1 -1 OW -1 -1 -1 -1 -1 -1 127.TIF EAST END 1920 3 16 -1 -1 SO -1 -1 -1 -1 -1 -1 141.TIF BOISE BLANC ISL. TO MACKINAW 1920 3 30 -1 -1 HF -1 -1 -1 -1 -1 -1 143.TIF BOTH ENDS OF STRAITS 1920 4 11 -1 -1 SO -1 -1 -1 -1 -1 -1 145.TIF WEST END OF STRAITS 1921 3 8 -1 -1 BK -1 -1 DI -1 -1 -1 -1 146.TIF EAST PORTION OF STRAITS 1921 3 15 -1 -1 PI -1 -1 -1 -1 -1 -1 147.TIF 1921 3 15 -1 -1 BK -1 -1 DC -1 -1 -1 -1 147.TIF EASTERN PORTION 1921 3 22 -1 -1 IP -1 -1 -1 -1 -1 -1 148.TIF SOUTH PASSAGE 1921 3 22 -1 -1 OW -1 -1 -1 -1 -1 -1 148.TIF NORTH CHANNEL 1921 3 22 -1 -1 OW -1 -1 -1 -1 -1 -1 148.TIF EAST END 1922 3 7 12 20 -1 -1 -1 -1 -1 -1 149.TIF 1922 3 7 -1 -1 IJ -1 -1 -1 -1 -1 -1 149.TIF OVER SHOAL SPOTS 1922 3 14 12 20 SO -1 -1 -1 -1 -1 -1 150.TIF 1922 3 14 -1 -1 IJ -1 -1 -1 -1 -1 -1 150.TIF OVER THE SHOALS 1922 3 21 20 -1 -1 -1 -1 -1 -1 -1 151.TIF 1922 3 28 20 -1 SO -1 -1 -1 -1 -1 -1 152.TIF 1922 4 4 12 15 SO -1 -1 -1 -1 -1 -1 153.TIF 1922 4 11 -1 -1 IP -1 -1 -1 -1 -1 -1 154.TIF EXTREME NE PORTION 1923 3 6 20 -1 -1 -1 -1 -1 -1 -1 155.TIF 1923 3 6 -1 -1 SO -1 -1 -1 -1 -1 -1 155.TIF EAST END OF STRAITS 1923 3 13 20 -1 SC -1 -1 -1 -1 -1 -1 156.TIF 1923 3 20 22 -1 SO -1 -1 SC -1 -1 -1 -1 157.TIF 1923 3 27 -1 -1 NC -1 -1 -1 -1 -1 -1 158.TIF 1923 3 27 -1 -1 SO -1 -1 -1 -1 -1 -1 158.TIF EAST END: TO POES REEF 1923 4 3 -1 -1 SO -1 -1 -1 -1 -1 -1 159.TIF 1923 4 10 22 30 SO -1 -1 SC -1 -1 -1 -1 160.TIF 1923 4 17 -1 -1 NC -1 -1 -1 -1 -1 -1 161.TIF 1924 3 4 18 -1 WI -1 -1 SC -1 -1 -1 -1 163.TIF 1924 3 11 18 -1 SC -1 -1 -1 -1 -1 -1 164.TIF 1924 3 11 -1 -1 SO -1 -1 -1 -1 -1 -1 164.TIF EAST END 1924 3 18 16 -1 NC -1 -1 -1 -1 -1 -1 165.TIF 1924 3 25 16 -1 SL -1 -1 -1 -1 -1 -1 166.TIF 1924 3 25 -1 -1 IP -1 -1 -1 -1 -1 -1 166.TIF EAST END 1924 4 1 -1 -1 NC -1 -1 -1 -1 -1 -1 167.TIF 1924 4 1 -1 -1 IP -1 -1 -1 -1 -1 -1 167.TIF EAST END: TO POES REEF 1924 4 8 -1 -1 NC -1 -1 RT -1 -1 -1 -1 168.TIF 1924 4 8 -1 -1 BK -1 -1 -1 -1 -1 -1 168.TIF TO POES REEF 1924 4 15 -1 -1 BK -1 -1 -1 -1 -1 -1 169.TIF CENTRAL PORTION 1924 4 15 -1 -1 BK -1 -1 DI -1 -1 -1 -1 169.TIF EASTERN END 1924 4 21 -1 -1 BK -1 -1 -1 -1 -1 -1 170.TIF 1925 3 17 12 -1 SO -1 -1 -1 -1 -1 -1 171.TIF 1925 3 24 10 -1 BK -1 -1 -1 -1 -1 -1 172.TIF 1925 3 31 -1 -1 BK -1 -1 -1 -1 -1 -1 173.TIF CENTRAL PORTION 1925 3 31 -1 -1 OW -1 -1 -1 -1 -1 -1 173.TIF EAST END OF SOUTH CHANNEL 1925 4 7 -1 -1 BK -1 -1 DI -1 -1 -1 -1 174.TIF 1925 4 7 -1 -1 SW -1 -1 -1 -1 -1 -1 174.TIF SOUTH CHANNEL 1925 4 14 -1 -1 OW -1 -1 -1 -1 -1 -1 175.TIF 1926 3 9 12 16 -1 -1 -1 -1 -1 -1 177.TIF 1926 3 30 -1 -1 FD -1 -1 -1 -1 -1 -1 180.TIF 1926 4 6 -1 -1 NC -1 -1 -1 -1 -1 -1 181.TIF 1926 4 13 -1 -1 IP -1 -1 -1 -1 -1 -1 182.TIF 1926 4 20 -1 -1 FD -1 -1 SO -1 -1 -1 -1 183.TIF 1926 4 27 -1 -1 OW -1 -1 -1 -1 -1 -1 184.TIF CENTRAL PART & NORTH CHANNEL 1926 4 27 -1 -1 IP -1 -1 -1 -1 -1 -1 184.TIF WEST END 1926 4 27 -1 -1 OW -1 -1 -1 -1 -1 -1 184.TIF EASTERN STRAITS TO PORT HURON 1927 3 8 16 -1 -1 -1 -1 -1 -1 -1 185.TIF 1927 3 15 14 -1 RT -1 -1 -1 -1 -1 -1 186.TIF 1927 3 22 -1 -1 SW -1 -1 -1 -1 -1 -1 187.TIF 1927 3 22 -1 -1 FD -1 -1 SO -1 -1 -1 -1 187.TIF WESTWARD 1927 3 29 -1 -1 SO -1 -1 RT -1 -1 -1 -1 188.TIF SOUTH PASSAGE 1927 3 29 -1 -1 SO -1 -1 RT -1 -1 -1 -1 188.TIF MCGULPINS PT. TO WHITE SHOALS 1927 4 5 -1 -1 OW -1 -1 -1 -1 -1 -1 189.TIF EXCEPT ALONG SOUTH SHORE 1927 4 5 -1 -1 LF -1 -1 BK -1 -1 -1 -1 189.TIF SOUTH SHORE 1928 3 13 -1 -1 NC -1 -1 -1 -1 -1 -1 191.TIF 1928 3 20 -1 -1 NC -1 -1 -1 -1 -1 -1 192.TIF 1928 3 20 -1 -1 IP -1 -1 -1 -1 -1 -1 192.TIF EAST END 1928 3 27 -1 -1 RT -1 -1 -1 -1 -1 -1 193.TIF 1928 3 27 -1 -1 OW -1 -1 -1 -1 -1 -1 193.TIF EAST END 1928 4 10 -1 -1 FD -1 -1 BK -1 -1 DI -1 -1 195.TIF 1928 4 10 -1 -1 OW -1 -1 -1 -1 -1 -1 195.TIF NORTH PASSAGE 1928 4 10 -1 -1 FD -1 -1 DI -1 -1 -1 -1 195.TIF SOUTH PASSAGE 1929 3 5 20 -1 -1 -1 -1 -1 -1 -1 196.TIF 1929 3 12 -1 -1 SO -1 -1 -1 -1 -1 -1 197.TIF EAST END 1929 3 26 -1 -1 SO -1 -1 -1 -1 -1 -1 199.TIF BOTH ENDS 1929 4 2 -1 -1 BK -1 -1 -1 -1 -1 -1 200.TIF WEST END 1929 4 2 -1 -1 BK -1 -1 -1 -1 -1 -1 200.TIF EAST END 1929 4 9 -1 -1 OW -1 -1 -1 -1 -1 -1 201.TIF 1930 3 4 -1 -1 FD -1 -1 SO -1 -1 -1 -1 202.TIF 1930 3 11 18 -1 SC 8 -1 -1 -1 -1 -1 203.TIF CHEBOYGAN TO WEST OF MACKINAW 1930 3 18 14 -1 NC -1 -1 SC -1 -1 BV -1 -1 204.TIF CHEBOYGAN TO WEST OF MACKINAW 1930 3 25 18 -1 NC -1 -1 -1 -1 -1 -1 205.TIF 1930 3 25 -1 -1 FD -1 -1 BV -1 -1 -1 -1 205.TIF CHEBOYGAN TO WEST OF MACKINAW 1930 4 1 -1 -1 FD -1 -1 NC -1 -1 -1 -1 206.TIF CHEBOYGAN TO W OF MACKINAW 1930 4 8 -1 -1 FD -1 -1 BV -1 -1 -1 -1 207.TIF 1930 4 15 -1 -1 BK -1 -1 -1 -1 -1 -1 208.TIF EAST END 1930 4 15 -1 -1 LF -1 -1 DI -1 -1 -1 -1 208.TIF EXCEPT EAST END 1930 4 15 -1 -1 OW -1 -1 -1 -1 -1 -1 208.TIF CHEBOYGAN 1931 3 3 12 -1 WI -1 -1 -1 -1 -1 -1 209.TIF 1931 3 10 17 -1 WI -1 -1 IN -1 -1 -1 -1 210.TIF 1931 3 17 18 -1 SO -1 -1 WI -1 -1 -1 -1 211.TIF 1931 3 24 18 -1 SO -1 -1 WI -1 -1 -1 -1 212.TIF 1931 3 31 18 -1 RT -1 -1 -1 -1 -1 -1 213.TIF 1931 4 7 -1 -1 RT -1 -1 DC -1 -1 -1 -1 214.TIF 1932 3 8 -1 -1 PI -1 -1 -1 -1 -1 -1 215.TIF 1932 3 8 -1 -1 OW -1 -1 BV -1 -1 -1 -1 215.TIF TO THE EAST & WEST 1932 3 22 8 -1 PI -1 -1 SO -1 -1 BV -1 -1 217.TIF 1932 3 29 -1 -1 SO -1 -1 -1 -1 -1 -1 525.TIF BOTH ENDS 1932 3 29 -1 -1 DI -1 -1 -1 -1 -1 -1 525.TIF BOIS BLANC TO ST. HELENA 1932 4 5 -1 -1 FD -1 -1 DI -1 -1 BV -1 -1 218.TIF EAST & WEST 1932 4 12 -1 -1 OW -1 -1 -1 -1 -1 -1 219.TIF 1933 3 14 16 18 SO -1 -1 -1 -1 -1 -1 221.TIF 1933 3 21 16 -1 IP -1 -1 BV -1 -1 -1 -1 222.TIF WESTWARD 1933 3 28 -1 -1 SW -1 -1 -1 -1 -1 -1 223.TIF EAST END 1933 4 4 16 -1 -1 -1 -1 -1 -1 -1 224.TIF 1933 4 11 -1 -1 RT -1 -1 SW -1 -1 -1 -1 225.TIF 1933 4 18 -1 -1 BK -1 -1 -1 -1 -1 -1 226.TIF EAST END 1933 4 25 -1 -1 IP -1 -1 -1 -1 -1 -1 227.TIF 1934 3 6 25 -1 SL 6 -1 -1 -1 -1 -1 228.TIF 1934 3 20 15 30 SO -1 -1 BV -1 -1 -1 -1 230.TIF IN ALL DIRECTIONS 1934 3 27 15 30 IP -1 -1 BV -1 -1 -1 -1 231.TIF IN ALL DIRECTIONS 1934 4 3 15 30 IP -1 -1 BV -1 -1 -1 -1 232.TIF IN ALL DIRECTIONS 1934 4 10 12 30 SO -1 -1 BV -1 -1 -1 -1 233.TIF IN ALL DIRECTIONS 1934 5 1 120 -1 WI -1 -1 -1 -1 -1 -1 236.TIF EAST PORTION 1935 3 5 12 14 -1 -1 -1 -1 -1 -1 237.TIF MIDDLE OF STRAITS 1935 3 5 -1 -1 WI -1 -1 -1 -1 -1 -1 237.TIF EAST & WEST ENDS 1935 3 12 12 14 NC -1 -1 -1 -1 -1 -1 238.TIF MIDDLE OF STRAITS 1935 3 26 -1 -1 HF -1 -1 -1 -1 -1 -1 240.TIF WEST END 1935 4 2 16 -1 -1 -1 -1 -1 -1 -1 241.TIF WEST END 1935 4 9 -1 -1 IP -1 -1 -1 -1 -1 -1 242.TIF 1935 4 16 -1 -1 DI -1 -1 -1 -1 -1 -1 243.TIF 1936 3 10 -1 -1 IP -1 -1 BV -1 -1 WI -1 -1 244.TIF IN ALL DIRECTIONS 1936 3 10 20 -1 -1 -1 -1 -1 -1 -1 244.TIF MIDDLE OF STRAITS 1936 3 10 28 30 -1 -1 -1 -1 -1 -1 244.TIF BAYS & HARBORS 1936 3 17 20 -1 -1 -1 -1 -1 -1 -1 245.TIF MIDDLE OF STRAITS 1936 3 23 -1 -1 IP -1 -1 BV -1 -1 -1 -1 246.TIF BOTH ENDS OF STRAITS 1936 3 23 20 -1 -1 -1 -1 -1 -1 -1 246.TIF MIDDLE OF STRAITS 1936 3 23 28 -1 -1 -1 -1 -1 -1 -1 246.TIF BAYS & HARBORS 1936 3 30 12 18 RT -1 -1 -1 -1 -1 -1 247.TIF MIDDLE OF STRAITS 1936 3 30 -1 -1 OW -1 -1 BV -1 -1 -1 -1 247.TIF IN LAKE HURON 1936 3 30 -1 -1 FD -1 -1 DI -1 -1 RT -1 -1 247.TIF IN LAKE MICHIGAN 1936 4 6 12 18 NC -1 -1 -1 -1 -1 -1 248.TIF 1936 4 13 8 14 RT -1 -1 SW -1 -1 -1 -1 249.TIF 1936 4 20 -1 -1 LF -1 -1 -1 -1 -1 -1 250.TIF 1936 4 27 -1 -1 BK -1 -1 -1 -1 -1 -1 251.TIF ENTIRE LENGTH 1937 3 8 -1 -1 IP -1 -1 BV -1 -1 WI -1 -1 254.TIF LAKE MICHIGAN ENTRANCE 1937 3 8 6 18 -1 -1 -1 -1 -1 -1 254.TIF CLEAR ICE IN STRAITS 1937 3 15 6 20 -1 -1 -1 -1 -1 -1 255.TIF 1937 3 15 -1 -1 WI -1 -1 BV -1 -1 -1 -1 255.TIF WEST END 1937 3 15 -1 -1 IP -1 -1 -1 -1 -1 -1 255.TIF SOUTH PASSAGE 1937 3 22 8 18 -1 -1 -1 -1 -1 -1 256.TIF SMOOTH ICE 1937 3 22 -1 -1 IP -1 -1 BV -1 -1 WI -1 -1 256.TIF LAKE MICHIGAN END 1937 3 29 8 18 NC -1 -1 -1 -1 -1 -1 257.TIF 1937 3 29 -1 -1 OW -1 -1 -1 -1 -1 -1 257.TIF 5MI W OF 14 FOOT SHOALS 1937 4 5 8 16 RT -1 -1 -1 -1 -1 -1 258.TIF 1937 4 5 -1 -1 IP -1 -1 BV -1 -1 -1 -1 258.TIF WEST END 1937 4 5 -1 -1 OW -1 -1 BV -1 -1 -1 -1 258.TIF 6MI W OF 14 FOOT SHOALS 1937 4 12 -1 -1 OW -1 -1 -1 -1 -1 -1 259.TIF WEST END CHANNEL (CUT) 1937 4 12 24 -1 -1 -1 -1 -1 -1 -1 259.TIF W END: EXCEPT CHANNEL (CUT) 1937 4 12 -1 -1 FD -1 -1 SO -1 -1 -1 -1 259.TIF EAST END 1937 4 12 -1 -1 BK -1 -1 -1 -1 -1 -1 259.TIF N & S CHANNELS (CUT) 1937 4 19 12 -1 IP -1 -1 BV -1 -1 -1 -1 260.TIF WEST END 1937 4 19 -1 -1 SW -1 -1 -1 -1 -1 -1 260.TIF W & NW OF CROSS VILLAGE 1937 4 19 -1 -1 BK -1 -1 DI -1 -1 -1 -1 260.TIF ST. HELENA ISLAND: EASTWARD 1938 3 7 16 27 BV -1 -1 SC -1 -1 -1 -1 261.TIF HURON ENTRANCE & N PASSAGE 1938 3 7 -1 -1 SW -1 -1 -1 -1 -1 -1 261.TIF S PASSAGE: INTO LAKE MICHIGAN 1938 3 7 -1 -1 IP -1 -1 WI -1 -1 -1 -1 261.TIF EAST END 1938 3 14 16 27 IP -1 -1 BV -1 -1 -1 -1 262.TIF BOTH ENDS 1938 3 14 -1 -1 SW -1 -1 -1 -1 -1 -1 262.TIF SOUTH PASSAGE 1938 3 21 16 27 -1 -1 -1 -1 -1 -1 263.TIF 1938 3 28 12 20 RT -1 -1 -1 -1 -1 -1 264.TIF BOTH ENDS 1938 4 4 -1 -1 LI -1 -1 -1 -1 -1 -1 265.TIF ENTIRE LENGTH 1938 4 4 -1 -1 LF -1 -1 -1 -1 -1 -1 265.TIF BAYS & HARBORS 1938 4 11 -1 -1 BK -1 -1 -1 -1 -1 -1 266.TIF EAST END 1938 4 18 -1 -1 BK -1 -1 -1 -1 -1 -1 267.TIF 1939 3 6 -1 -1 IP -1 -1 BV -1 -1 -1 -1 268.TIF BOTH ENDS OF STRAITS 1939 3 6 20 -1 -1 -1 -1 -1 -1 -1 268.TIF SOUTH CHANNEL 1939 3 13 14 20 IP -1 -1 BV -1 -1 -1 -1 269.TIF BOTH ENDS 1939 3 20 16 22 -1 -1 -1 -1 -1 -1 270.TIF HARBORS 1939 3 20 -1 -1 IP -1 -1 BV -1 -1 -1 -1 270.TIF BOTH ENDS 1939 3 20 -1 -1 WI -1 -1 -1 -1 -1 -1 270.TIF WEST END 1939 3 27 16 24 -1 -1 -1 -1 -1 -1 271.TIF 1939 3 27 16 24 WI -1 -1 -1 -1 -1 -1 271.TIF WEST END 1939 4 3 14 22 IP -1 -1 BV -1 -1 -1 -1 272.TIF BOTH ENDS 1939 4 3 -1 -1 SO -1 -1 -1 -1 -1 -1 272.TIF FROM GRAHAM SHOALS WESTWARD 1939 4 10 -1 -1 IP -1 -1 BV -1 -1 -1 -1 273.TIF BOTH ENDS 1939 4 17 -1 -1 IP -1 -1 -1 -1 -1 -1 274.TIF SOUTH CHANNEL 1939 4 24 -1 -1 BK -1 -1 -1 -1 -1 -1 275.TIF NORTH & SOUTH CHANNELS 1940 3 4 -1 -1 IP -1 -1 BV -1 -1 -1 -1 277.TIF NORTH PASSAGE 1940 3 4 -1 -1 IP -1 -1 BV -1 -1 -1 -1 277.TIF EAST END: SOUTH PASSAGE 1940 3 4 -1 -1 SW -1 -1 -1 -1 -1 -1 277.TIF WEST END 1940 3 11 -1 -1 IP -1 -1 BV -1 -1 -1 -1 278.TIF SOUTH CHANNEL: INTO LAKE HURON 1940 3 11 -1 -1 IP -1 -1 BV -1 -1 -1 -1 278.TIF NORTH PASSAGE 1940 3 11 22 -1 -1 -1 -1 -1 -1 -1 278.TIF BOTH ENDS 1940 3 18 24 -1 IP -1 -1 -1 -1 -1 -1 279.TIF BOTH ENDS 1940 3 18 -1 -1 IP -1 -1 BV -1 -1 -1 -1 279.TIF SOUTH CHANNEL 1940 3 18 -1 -1 IP -1 -1 BV -1 -1 -1 -1 279.TIF NORTH ABOUT PASSAGE 1940 3 18 -1 -1 DI -1 -1 NI -1 -1 -1 -1 279.TIF SOUTH ABOUT PASSAGE 1940 3 24 24 -1 -1 -1 -1 -1 -1 -1 280.TIF SMOOTH AREAS 1940 3 24 -1 -1 IP -1 -1 BV -1 -1 -1 -1 280.TIF EAST END 1940 3 24 -1 -1 DI -1 -1 -1 -1 -1 -1 280.TIF WEST END 1940 4 1 -1 -1 OW -1 -1 -1 -1 -1 -1 281.TIF S CHANNEL: E OF 14 FOOT SHOALS 1940 4 1 22 -1 IP -1 -1 BV -1 -1 -1 -1 281.TIF NORTH PASSAGE 1940 4 8 -1 -1 LI -1 -1 -1 -1 -1 -1 282.TIF WEST END 1940 4 8 -1 -1 RT -1 -1 -1 -1 -1 -1 282.TIF SOUTH CHANNEL 1940 4 8 -1 -1 LI -1 -1 -1 -1 -1 -1 282.TIF NORTH CHANNEL 1940 4 15 -1 -1 OW -1 -1 -1 -1 -1 -1 283.TIF WEST END & NORTH CHANNEL 1940 4 15 -1 -1 IP -1 -1 -1 -1 -1 -1 283.TIF SOUTH CHANNEL 1940 4 22 -1 -1 BK -1 -1 DI -1 -1 -1 -1 284.TIF SOUTH CHANNEL 1940 4 22 -1 -1 DI -1 -1 -1 -1 -1 -1 284.TIF 1941 3 3 12 -1 -1 -1 -1 -1 -1 -1 285.TIF CHANNEL 1941 3 10 12 14 -1 -1 -1 -1 -1 -1 286.TIF BOAT CHANNEL 1941 3 10 20 -1 -1 -1 -1 -1 -1 -1 286.TIF HARBORS 1941 3 17 -1 -1 IP -1 -1 BV -1 -1 -1 -1 287.TIF NORTH ABOUT CHANNEL (WEST END) 1941 3 17 -1 -1 SW -1 -1 -1 -1 -1 -1 287.TIF EAST END 1941 3 17 4 -1 -1 -1 -1 -1 -1 -1 287.TIF ROUND ISLAND PASSAGE 1941 3 24 16 -1 NC -1 -1 -1 -1 -1 -1 288.TIF BOAT CHANNEL 1941 3 24 22 -1 -1 -1 -1 -1 -1 -1 288.TIF BAYS & HARBORS 1941 3 31 -1 -1 IP -1 -1 BV -1 -1 SW -1 -1 289.TIF NORTH ABOUT PASSAGE 1941 4 7 -1 -1 SW -1 -1 -1 -1 -1 -1 290.TIF SOUTH ABOUT PASSAGE 1941 4 14 -1 -1 LF -1 -1 SW -1 -1 -1 -1 291.TIF ENTIRE LENGTH 1941 4 14 -1 -1 IP -1 -1 -1 -1 -1 -1 291.TIF BAYS & HARBORS: N SIDE W END 1941 4 14 -1 -1 DC -1 -1 -1 -1 -1 -1 291.TIF NORTH CHANNEL 1942 3 9 20 -1 SO -1 -1 -1 -1 -1 -1 292.TIF SOUTH CHANNEL 1942 3 16 -1 -1 SO -1 -1 SC -1 -1 -1 -1 293.TIF GARDEN ISLE TO NORTH SHORE 1942 3 16 -1 -1 OW -1 -1 -1 -1 -1 -1 293.TIF ROUND ISLAND PASSAGE 1942 3 16 18 -1 -1 -1 -1 -1 -1 -1 293.TIF SMOOTH ICE IN EAST END 1942 3 16 12 -1 -1 -1 -1 -1 -1 -1 293.TIF SMOOTH ICE IN WEST END 1942 3 23 -1 -1 BK -1 -1 -1 -1 -1 -1 294.TIF MCGULPINS POINT 1942 3 23 18 -1 -1 -1 -1 -1 -1 -1 294.TIF SMOOTH ICE IN SOUTH CHANNEL 1942 3 23 12 -1 -1 -1 -1 -1 -1 -1 294.TIF SMOOTH ICE IN WEST END 1942 3 23 -1 -1 SW -1 -1 -1 -1 -1 -1 294.TIF SOUTH ABOUT PASSAGE 1942 3 30 8 -1 SO -1 -1 -1 -1 -1 -1 295.TIF SOUTH CHANNEL 1942 4 13 -1 -1 LF -1 -1 SI -1 -1 DI -1 -1 297.TIF 1943 3 1 22 -1 IP -1 -1 BV -1 -1 -1 -1 298.TIF WEST END: BOTH PASSAGES 1943 3 1 -1 -1 OW -1 -1 BV -1 -1 -1 -1 298.TIF 14 FOOT SHOALS: INTO L. HURON 1943 3 8 24 -1 IN -1 -1 -1 -1 -1 -1 299.TIF SMOOTH ICE AREAS 1943 3 15 -1 -1 SO -1 -1 NC -1 -1 -1 -1 300.TIF ENTIRE STRAITS 1943 3 15 24 -1 NC -1 -1 -1 -1 -1 -1 300.TIF CLEAR ICE AREAS 1943 3 15 -1 -1 IP -1 -1 BV -1 -1 -1 -1 300.TIF WEST END: BOTH PASSAGES 1943 3 15 -1 -1 SO -1 -1 -1 -1 -1 -1 300.TIF EAST END OF SOUTH CHANNEL 1943 3 22 25 -1 SO -1 -1 -1 -1 -1 -1 301.TIF CLEAR ICE AREAS 1943 3 29 16 20 -1 -1 -1 -1 -1 -1 302.TIF CLEAR ICE IN STRAITS PROPER 1943 4 5 18 -1 IN -1 -1 -1 -1 -1 -1 303.TIF CLEAR ICE AREAS 1943 4 12 -1 -1 BK -1 -1 -1 -1 -1 -1 304.TIF SOUTH CHANNEL (CUT) 1943 4 12 -1 -1 BK -1 -1 -1 -1 -1 -1 304.TIF NORTH CHANNEL (CUT) 1943 4 19 -1 -1 DI -1 -1 -1 -1 -1 -1 305.TIF SOUTH CHANNEL 1943 4 26 -1 -1 IP -1 -1 SW -1 -1 -1 -1 306.TIF SOUTH CHANNEL 1943 4 26 -1 -1 OW -1 -1 BV -1 -1 -1 -1 306.TIF WESTWARD IN S. ABOUT PASSAGE 1943 4 26 -1 -1 IP -1 -1 BV -1 -1 -1 -1 306.TIF NORTH ABOUT PASSAGE 1943 4 26 -1 -1 DI -1 -1 BK -1 -1 -1 -1 306.TIF WEST OF MCGULPINS POINT 1944 3 6 -1 -1 IP -1 -1 BV -1 -1 -1 -1 308.TIF WEST END: BOTH PASSAGES 1944 3 13 -1 -1 IP -1 -1 BV -1 -1 -1 -1 309.TIF WEST END: BOTH PASSAGES 1944 3 20 -1 -1 IP -1 -1 BV -1 -1 -1 -1 310.TIF WEST END: BOTH PASSAGES 1944 3 27 -1 -1 IP -1 -1 BV -1 -1 -1 -1 311.TIF NORTH ABOUT PASSAGE 1944 3 27 -1 -1 BK -1 -1 -1 -1 -1 -1 311.TIF N & S CHANNELS (CUT) 1944 4 3 -1 -1 SW -1 -1 -1 -1 -1 -1 312.TIF SOUTH CHANNEL 1944 4 3 -1 -1 DI -1 -1 BK -1 -1 BV -1 -1 312.TIF WEST END: BOTH PASSAGES 1944 4 10 -1 -1 IP -1 -1 -1 -1 -1 -1 313.TIF SOUTH CHANNEL 1944 4 10 -1 -1 IP -1 -1 -1 -1 -1 -1 313.TIF BAYS & HARBORS 1944 4 10 -1 -1 OW -1 -1 BV -1 -1 -1 -1 313.TIF WEST END: SOUTH ABOUT PASSAGE 1944 4 10 -1 -1 IP -1 -1 BV -1 -1 -1 -1 313.TIF WEST END: NORTH ABOUT PASSAGE 1944 4 17 -1 -1 OW -1 -1 -1 -1 -1 -1 314.TIF EXCEPT FOR SHORE ICE 1945 3 19 -1 -1 SO -1 -1 -1 -1 -1 -1 315.TIF 12Mi IN SOUTH CHANNEL 1945 3 19 -1 -1 BK -1 -1 SW -1 -1 -1 -1 315.TIF RR FERRY CHANNEL TO MCGULPINS 1945 3 19 -1 -1 SO -1 -1 BV -1 -1 -1 -1 315.TIF MCGULPINS POINT: WESTWARD 1945 3 19 22 -1 -1 -1 -1 -1 -1 -1 315.TIF CLEAR ICE AREAS 1945 3 26 -1 -1 LI -1 -1 -1 -1 -1 -1 316.TIF NORTH & SOUTH CHANNELS 1945 4 2 -1 -1 LF -1 -1 BK -1 -1 RT -1 -1 317.TIF NORTH SHORE 1946 3 4 28 -1 -1 -1 -1 -1 -1 -1 318.TIF SMOOTH ICE AREAS 1946 3 4 -1 -1 LF -1 -1 DI -1 -1 SW -1 -1 318.TIF 14 FOOT SHOALS: INTO L. HURON 1946 3 4 -1 -1 SO -1 -1 BV -1 -1 WI -1 -1 318.TIF 14 FT. SHOALS: INTO L. MICHIGA 1946 3 11 -1 -1 SO -1 -1 BV -1 -1 -1 -1 319.TIF BOTH PASSAGES 1946 3 25 -1 -1 DI -1 -1 -1 -1 -1 -1 321.TIF CHANNEL 1946 3 25 -1 -1 BK -1 -1 BV -1 -1 -1 -1 321.TIF NORTH ABOUT PASSAGE 1946 3 25 -1 -1 DI -1 -1 -1 -1 -1 -1 321.TIF SOUTH ABOUT PASSAGE 1946 4 1 -1 -1 IP -1 -1 RT -1 -1 BK -1 -1 322.TIF S SHORE: NEAR MCGULPINS PT. 1946 4 1 -1 -1 OW -1 -1 -1 -1 -1 -1 322.TIF CHANNELS & PASSAGES 1946 4 8 -1 -1 OW -1 -1 -1 -1 -1 -1 323.TIF 1947 2 19 -1 -1 WI -1 -1 SW -1 -1 -1 -1 324.TIF 1947 2 19 -1 -1 OW -1 -1 -1 -1 -1 -1 324.TIF BEYOND SPECTACLE REEF 1947 2 19 -1 -1 WI -1 -1 -1 -1 -1 -1 324.TIF ENTIRE STRAITS 1947 3 3 -1 -1 WI -1 -1 -1 -1 -1 -1 326.TIF ENTIRE LENGTH 1947 3 3 -1 -1 IP -1 -1 BV -1 -1 -1 -1 326.TIF INTO LAKES MICHIGAN & HURON 1947 3 3 -1 -1 WI 360 -1 -1 -1 -1 -1 326.TIF OLD MACKINAC POINT 1947 3 10 -1 -1 OW -1 -1 BV -1 -1 -1 -1 327.TIF FOURTEEN FOOT SHOALS: EASTWARD 1947 3 10 -1 -1 HF -1 -1 WI -1 -1 BV -1 -1 327.TIF FOURTEEN FOOT SHOALS: WESTWARD 1947 3 24 22 -1 WI -1 -1 -1 -1 -1 -1 329.TIF 1947 3 31 20 -1 -1 -1 -1 -1 -1 -1 330.TIF SMOOTH ICE AREAS 1947 4 7 -1 -1 DI -1 -1 -1 -1 -1 -1 331.TIF SOUTH CHANNEL 1947 4 14 -1 -1 OW -1 -1 BV -1 -1 -1 -1 332.TIF ENTIRE SOUTH CHANNEL 1947 4 14 -1 -1 IP -1 -1 -1 -1 -1 -1 332.TIF NORTH SHORE 1947 4 21 -1 -1 LF -1 -1 -1 -1 -1 -1 333.TIF SOUTH SHORE 1948 3 1 30 -1 SC -1 -1 -1 -1 -1 -1 334.TIF CLEAR ICE AREAS 1948 3 8 30 -1 IN -1 -1 -1 -1 -1 -1 335.TIF 1948 3 15 30 -1 SC -1 -1 -1 -1 -1 -1 336.TIF 1948 3 22 22 -1 -1 -1 -1 -1 -1 -1 337.TIF STEAMER CHANNELS 1948 3 22 26 -1 SO -1 -1 -1 -1 -1 -1 337.TIF BAYS & HARBORS 1948 3 22 -1 -1 SO -1 -1 -1 -1 -1 -1 337.TIF ENTIRE LENGTH 1948 3 29 -1 -1 IP -1 -1 -1 -1 -1 -1 338.TIF 1948 4 12 -1 -1 LI -1 -1 -1 -1 -1 -1 340.TIF 1949 2 28 -1 -1 IP -1 -1 WI -1 -1 -1 -1 526.TIF SOUTH CHANNEL 1949 2 28 -1 -1 IP -1 -1 BV -1 -1 -1 -1 526.TIF NORTH ABOUT PASSAGE 1949 2 28 -1 -1 DI -1 -1 NI -1 -1 -1 -1 526.TIF SOUTH ABOUT PASSAGE 1949 3 7 -1 -1 WI -1 -1 -1 -1 -1 -1 341.TIF E OF OLD MACKINAC POINT LIGHT 1949 3 7 18 -1 WI -1 -1 -1 -1 -1 -1 341.TIF 1949 3 14 -1 -1 SO -1 -1 NC -1 -1 -1 -1 343.TIF ENTIRE LENGTH 1949 3 14 -1 -1 SO -1 -1 BV -1 -1 -1 -1 343.TIF NORTH & SOUTH ABOUT PASSAGES 1949 3 21 -1 -1 SO -1 -1 BV -1 -1 -1 -1 345.TIF NORTH ABOUT PASSAGE 1949 3 21 -1 -1 SO -1 -1 PI -1 -1 WI -1 -1 345.TIF WEST END OF SOUTH CHANNEL 1949 3 21 -1 -1 DI -1 -1 -1 -1 -1 -1 345.TIF MID & EAST SOUTH CHANNEL 1949 3 28 -1 -1 RT -1 -1 SW -1 -1 -1 -1 347.TIF NORTH & SOUTH CHANNELS 1950 2 16 -1 -1 SO -1 -1 BV -1 -1 WI -1 -1 348.TIF NORTH ABOUT CHANNEL 1950 2 27 -1 -1 IP -1 -1 BV -1 -1 -1 -1 349.TIF N & S ABOUT PASSAGES 1950 2 27 24 -1 WI -1 -1 -1 -1 -1 -1 349.TIF NEAR FERRY DOCKS 1950 3 6 -1 -1 WI -1 -1 BV -1 -1 -1 -1 350.TIF NORTH & SOUTH ABOUT PASSAGES 1950 3 6 28 -1 WI 600 -1 SC -1 -1 -1 -1 350.TIF 1950 3 13 -1 -1 IP -1 -1 BV -1 -1 -1 -1 351.TIF EAST END 1950 3 13 -1 -1 SO -1 -1 BV -1 -1 -1 -1 351.TIF FOURTEEN FOOT SHOALS: WESTWARD 1950 3 20 -1 -1 SO -1 -1 BV -1 -1 -1 -1 352.TIF N & S ABOUT PASSAGES 1950 3 27 -1 -1 IP -1 -1 BV -1 -1 -1 -1 353.TIF ALL PASSAGES AND CHANNELS 1950 3 27 -1 -1 SW -1 -1 -1 -1 -1 -1 353.TIF FOURTEEN FOOT SHOALS 1950 4 3 -1 -1 SO -1 -1 BV -1 -1 -1 -1 354.TIF NORTH ABOUT PASSAGE 1950 4 3 19 -1 CL -1 -1 RT -1 -1 SC -1 -1 354.TIF SMOOTH ICE AREAS 1950 4 10 -1 -1 SO -1 -1 BV -1 -1 -1 -1 355.TIF NORTH ABOUT PASSAGE 1950 4 10 -1 -1 LI -1 -1 -1 -1 -1 -1 355.TIF SOUTH ABOUT PASSAGE 1950 4 10 18 -1 -1 -1 -1 -1 -1 -1 355.TIF CLEAR ICE AREAS 1950 4 17 -1 -1 DI -1 -1 RT -1 -1 -1 -1 356.TIF SOUTH CHANNEL 1950 4 17 -1 -1 SO -1 -1 BV -1 -1 -1 -1 356.TIF NORTH ABOUT PASSAGE 1950 4 24 -1 -1 OW -1 -1 -1 -1 -1 -1 357.TIF SOUTH CHANNEL 1950 4 24 -1 -1 IP -1 -1 BV -1 -1 -1 -1 357.TIF FROM 2Mi W OF OLD MACKINAC POI 1950 4 24 -1 -1 IP -1 -1 BV -1 -1 -1 -1 357.TIF NORTH ABOUT PASSAGE 1950 4 24 -1 -1 SW -1 -1 -1 -1 -1 -1 357.TIF SOUTH ABOUT PASSAGE 1950 5 1 -1 -1 PN -1 -1 RT -1 -1 -1 -1 358.TIF 1951 2 26 -1 -1 OW -1 -1 -1 -1 -1 -1 359.TIF FOURTEEN FT. SHOALS LIGHTHOUSE 1951 2 26 -1 -1 IP -1 -1 BV -1 -1 -1 -1 359.TIF FOURTEEN FOOT SHOALS: WESTWARD 1951 2 26 -1 -1 IP -1 -1 BV -1 -1 -1 -1 359.TIF SOUTH ABOUT PASSAGE 1951 3 5 -1 -1 SO -1 -1 BV -1 -1 -1 -1 360.TIF NORTH ABOUT PASSAGE 1951 3 5 -1 -1 SO -1 -1 BV -1 -1 -1 -1 360.TIF SOUTH ABOUT PASSAGE 1951 3 5 16 -1 CL -1 -1 RT -1 -1 -1 -1 360.TIF OLD MACKINAC POINT: WESTWARD 1951 3 5 -1 -1 IP -1 -1 -1 -1 -1 -1 360.TIF OLD MACKINAC POINT: EASTWARD 1951 3 12 -1 -1 SO -1 -1 -1 -1 -1 -1 361.TIF SOUTH CHANNEL: FOR 12Mi 1951 3 12 -1 -1 SO -1 -1 BV -1 -1 -1 -1 361.TIF NORTH ABOUT PASSAGE 1951 3 12 -1 -1 DI -1 -1 SW -1 -1 -1 -1 361.TIF SOUTH ABOUT PASSAGE 1951 3 12 18 -1 CL -1 -1 -1 -1 -1 -1 361.TIF MOST STATIONS 1951 3 19 -1 -1 SO -1 -1 -1 -1 -1 -1 362.TIF SOUTH CHANNEL: FOR 10Mi 1951 3 19 -1 -1 SO -1 -1 BV -1 -1 -1 -1 362.TIF NORTH ABOUT PASSAGE 1951 3 19 -1 -1 SO -1 -1 BV -1 -1 -1 -1 362.TIF OLD MACKINAC PT: INTO L. MIC. 1951 3 26 -1 -1 DI -1 -1 WI -1 -1 -1 -1 363.TIF SOUTH CHANNEL 1951 3 26 -1 -1 DI -1 -1 BV -1 -1 -1 -1 363.TIF NORTH ABOUT PASSAGE 1951 3 26 -1 -1 DI -1 -1 BV -1 -1 -1 -1 363.TIF SOUTH ABOUT PASSAGE 1951 3 26 -1 -1 DI -1 -1 BV -1 -1 -1 -1 363.TIF OLD MACKINAC POINT: WESTWARD 1951 3 26 -1 -1 SW -1 -1 -1 -1 -1 -1 363.TIF MCGULPINS POINT 1951 4 2 -1 -1 DI -1 -1 -1 -1 -1 -1 364.TIF NORTH CHANNEL 1951 4 2 -1 -1 DI -1 -1 -1 -1 -1 -1 364.TIF SOUTH CHANNEL 1951 4 2 -1 -1 OW -1 -1 -1 -1 -1 -1 364.TIF OLD MACKINAC POINT LIGHT 1951 4 9 -1 -1 LI -1 -1 -1 -1 -1 -1 365.TIF 1951 4 16 -1 -1 LI -1 -1 -1 -1 -1 -1 366.TIF 1952 2 25 12 16 CL -1 -1 -1 -1 -1 -1 367.TIF SOUTH CHANNEL 1952 2 25 -1 -1 HF -1 -1 WI -1 -1 -1 -1 367.TIF W OF OLD MACKINAC POINT LIGHT 1952 3 3 10 18 CL -1 -1 SC -1 -1 -1 -1 368.TIF SOUTH CHANNEL 1952 3 3 -1 -1 WI -1 -1 SC -1 -1 -1 -1 368.TIF OLD MACKINAC POINT: WESTWARD 1952 3 10 10 18 SC -1 -1 IN -1 -1 -1 -1 369.TIF 1952 3 10 -1 -1 SO -1 -1 WI -1 -1 SC -1 -1 369.TIF OLD MACKINAC POINT: WESTWARD 1952 3 17 -1 -1 BK -1 -1 SC -1 -1 SL -1 -1 370.TIF (CUT) 1952 3 24 -1 -1 OW -1 -1 -1 -1 -1 -1 371.TIF SOUTH CHANNEL 1952 3 31 20 -1 RT -1 -1 PN -1 -1 -1 -1 372.TIF SOUTH ABOUT PASSAGE 1952 3 31 -1 -1 HF -1 -1 WI -1 -1 -1 -1 372.TIF NORTH ABOUT PASSAGE 1952 3 31 -1 -1 HF -1 -1 WI -1 -1 -1 -1 372.TIF NORTH SHORE 1952 4 7 -1 -1 IP -1 -1 -1 -1 -1 -1 373.TIF OLD MACKINAC POINT 1952 4 7 -1 -1 OW -1 -1 -1 -1 -1 -1 373.TIF SIMMONS REEF: TO 1Mi SOUTH 1952 4 14 -1 -1 OW -1 -1 BV -1 -1 -1 -1 374.TIF NORTH ABOUT PASSAGE 1952 4 14 -1 -1 IP -1 -1 -1 -1 -1 -1 374.TIF SHORE: EAST TO MCGULPINS POINT 1952 4 14 -1 -1 IP -1 -1 -1 -1 -1 -1 374.TIF CECIL BAY 1952 4 14 -1 -1 IP -1 -1 -1 -1 -1 -1 374.TIF BIG STONE BAY 1953 2 24 2 16 -1 -1 -1 -1 -1 -1 375.TIF SMOOTH ICE AREAS 1953 2 24 -1 -1 LF -1 -1 -1 -1 -1 -1 375.TIF EAST END OF SOUTH CHANNEL 1953 3 2 -1 -1 BK -1 -1 -1 -1 -1 -1 528.TIF SOUTH CHANNEL (CUT) 1953 3 9 -1 -1 HF -1 -1 WI -1 -1 BV -1 -1 376.TIF OLD MACKINAW POINT: WESTWARD 1953 3 9 -1 -1 BK -1 -1 -1 -1 -1 -1 376.TIF SOUTH CHANNEL (CUT) 1953 3 16 -1 -1 DI -1 -1 PI -1 -1 -1 -1 378.TIF SOUTH CHANNEL 1953 3 16 -1 -1 SO -1 -1 WI -1 -1 -1 -1 378.TIF MCGULPINS POINT: WESTWARD 1953 3 16 -1 -1 SO -1 -1 PI -1 -1 -1 -1 378.TIF OLD MACKINAC POINT 1953 3 16 -1 -1 IP -1 -1 -1 -1 -1 -1 378.TIF WEST ENTRANCE 1953 3 23 -1 -1 OW -1 -1 -1 -1 -1 -1 379.TIF SOUTH CHANNEL 1953 3 23 -1 -1 LF -1 -1 -1 -1 -1 -1 379.TIF OLD MACKINAW POINT: WESTWARD 1953 3 30 -1 -1 PI -1 -1 -1 -1 -1 -1 380.TIF CECIL BAY 1953 3 30 -1 -1 PI -1 -1 -1 -1 -1 -1 380.TIF BIG STONE BAY 1954 3 1 1 18 SW -1 -1 -1 -1 -1 -1 381.TIF 1954 3 1 -1 -1 SO -1 -1 DI -1 -1 -1 -1 381.TIF SOUTH CHANNEL 1954 3 1 -1 -1 OW -1 -1 -1 -1 -1 -1 381.TIF FOURTEEN FOOT SHOALS 1954 3 8 1 18 IP -1 -1 BV -1 -1 WI -1 -1 382.TIF NORTH ABOUT PASSAGE 1954 3 8 1 18 IP -1 -1 BV -1 -1 WI -1 -1 382.TIF SOUTH ABOUT PASSAGE 1954 3 8 -1 -1 OW -1 -1 -1 -1 -1 -1 382.TIF L. HURON TO 7Mi W OF 14FT SHOA 1954 3 15 1 16 WI -1 -1 -1 -1 -1 -1 383.TIF OLD MACKINAC POINT: WESTWARD 1954 3 15 -1 -1 OW -1 -1 -1 -1 -1 -1 383.TIF L. HUR. TO 7Mi W OF 14 FT SHOA 1954 3 22 -1 -1 IP -1 -1 -1 -1 -1 -1 384.TIF OLD MACKINAW POINT: WESTWARD 1954 3 22 -1 -1 DI -1 -1 -1 -1 -1 -1 384.TIF SOUTH CHANNEL 1954 3 29 -1 -1 OW -1 -1 -1 -1 -1 -1 385.TIF EXCEPT E END OF SOUTH CHANNEL 1954 3 29 -1 -1 BK -1 -1 SW -1 -1 -1 -1 385.TIF EAST END OF SOUTH CHANNEL 1954 4 5 -1 -1 IP -1 -1 -1 -1 -1 -1 386.TIF ALONG NORTH & SOUTH SHORES 1954 4 5 -1 -1 LF -1 -1 DI -1 -1 -1 -1 386.TIF MAIN CHANNEL 1954 4 12 -1 -1 LF -1 -1 DI -1 -1 -1 -1 387.TIF OLD MACKINAC PT: E ALONG SHORE 1954 4 12 -1 -1 LI -1 -1 DI -1 -1 -1 -1 387.TIF ALL CHANNELS 1955 2 28 1 6 SW -1 -1 -1 -1 -1 -1 389.TIF 14 FOOT SHOALS: INTO L. HURON 1955 2 28 1 16 SO -1 -1 BV -1 -1 -1 -1 389.TIF 14 FOOT SHOALS: WESTWARD 1955 3 7 16 -1 CL -1 -1 -1 -1 -1 -1 391.TIF 1955 3 14 -1 -1 LI -1 -1 -1 -1 -1 -1 393.TIF 14 FOOT SHOALS: INTO L. HURON 1955 3 14 -1 -1 SO -1 -1 -1 -1 -1 -1 393.TIF N ABOUT PASSAGE: ENTIRE LENGTH 1955 3 21 16 -1 SO -1 -1 -1 -1 -1 -1 394.TIF FOR 14Mi IN SOUTH CHANNEL 1955 3 21 16 -1 SO -1 -1 BV -1 -1 -1 -1 394.TIF NORTH ABOUT PASSAGE 1955 3 28 -1 -1 BK -1 -1 -1 -1 -1 -1 395.TIF NORTH CHANNEL (CUT) 1955 3 28 -1 -1 DI -1 -1 -1 -1 -1 -1 395.TIF SOUTH CHANNEL 1955 4 11 -1 -1 OW -1 -1 -1 -1 -1 -1 396.TIF NEARLY ALL CHANNELS & PASSAGES 1956 2 27 -1 -1 IP -1 -1 -1 -1 -1 -1 397.TIF SOUTH CHANNEL 1956 2 27 -1 -1 SO -1 -1 SW -1 -1 -1 -1 397.TIF NORTH ABOUT PASSAGE 1956 3 5 -1 -1 IP -1 -1 -1 -1 -1 -1 399.TIF SOUTH CHANNEL 1956 3 5 -1 -1 SO -1 -1 BV -1 -1 -1 -1 399.TIF OLD MACKINAC PT: INTO L. MIC. 1956 3 12 -1 -1 SO -1 -1 -1 -1 -1 -1 401.TIF SOUTH CHANNEL: FOR 13Mi 1956 3 12 -1 -1 SO -1 -1 BV -1 -1 -1 -1 401.TIF WESTWARD FROM OLD MACKINAC PT. 1956 3 12 -1 -1 NI -1 -1 DI -1 -1 SC 2 3 401.TIF 6 NORTH ABOUT PASSAGE 1956 3 19 -1 -1 SO -1 -1 -1 -1 -1 -1 402.TIF SOUTH CHANNEL 1956 3 19 -1 -1 SO -1 -1 BV -1 -1 -1 -1 402.TIF NORTH ABOUT PASSAGE 1956 3 19 -1 -1 NI -1 -1 BV -1 -1 -1 -1 402.TIF 4Mi W OF 14 FT SHOALS: TO L. 1956 3 26 -1 -1 BK -1 -1 -1 -1 -1 -1 403.TIF SOUTH ABOUT PASSAGE (CUT) 1956 3 26 -1 -1 SO -1 -1 -1 -1 -1 -1 403.TIF OLD MACKINAC POINT: WESTWARD 1956 4 2 -1 -1 OW -1 -1 BV -1 -1 -1 -1 404.TIF OLD MACKINAC POINT 1956 4 2 -1 -1 DI -1 -1 BV -1 -1 -1 -1 404.TIF ALONG NORTH SHORE 1956 4 2 -1 -1 HF -1 -1 DI -1 -1 -1 -1 404.TIF IN CHANNELS 1956 4 9 -1 -1 OW -1 -1 -1 -1 -1 -1 405.TIF ALL CHANNELS 1956 4 16 -1 -1 OW -1 -1 -1 -1 -1 -1 406.TIF EXCEPT S & SW OF MCGULPINS PT. 1956 4 16 -1 -1 LF -1 -1 -1 -1 -1 -1 406.TIF S & SW OF MCGULPINS POINT 1957 2 25 18 -1 -1 -1 -1 -1 -1 -1 407.TIF SMOOTH ICE IN BAYS 1957 3 4 -1 -1 SO -1 -1 BV -1 -1 -1 -1 409.TIF NORTH & SOUTH ABOUT PASSAGES 1957 3 11 -1 -1 SO -1 -1 BV -1 -1 -1 -1 411.TIF 14 FOOT SHOALS: WESTWARD 1957 3 11 -1 -1 FD -1 -1 SO -1 -1 CL -1 -1 411.TIF EAST TO NORTH BOIS BLANC 1957 3 25 18 -1 SO -1 -1 CL -1 -1 RT -1 -1 413.TIF MCGULPINS POINT: WESTWARD 1957 3 25 -1 -1 FD -1 -1 DI -1 -1 BK -1 -1 413.TIF SOUTH CHANNEL 1957 3 25 -1 -1 SO -1 -1 -1 -1 -1 -1 413.TIF BOTH PASSAGES 1957 4 1 -1 -1 SO -1 -1 -1 -1 -1 -1 414.TIF FOR 4Mi IN SOUTH CHANNEL 1958 3 3 -1 -1 IP -1 -1 SW -1 -1 -1 -1 417.TIF 1958 3 10 1 24 SC 4 -1 -1 -1 -1 -1 418.TIF MAJORITY OF STRAITS 1958 3 10 -1 -1 FD -1 -1 FS -1 -1 -1 -1 418.TIF TO LANSING SHOALS LIGHT 1958 3 17 -1 -1 IP -1 -1 RT -1 -1 -1 -1 419.TIF ALONG SHORE 1958 3 17 -1 -1 IP -1 -1 -1 -1 -1 -1 419.TIF EXCEPT ROUND ISLAND PASSAGE 1958 3 17 -1 -1 IP -1 -1 BV -1 -1 -1 -1 419.TIF INTO LAKE HURON 1958 3 24 -1 -1 RT -1 -1 -1 -1 -1 -1 420.TIF ALONG SHORE 1958 3 31 -1 -1 OW -1 -1 BV -1 -1 -1 -1 421.TIF 14 FOOT SHOALS: INTO L. HURON 1958 3 31 -1 -1 SO -1 -1 BV -1 -1 -1 -1 421.TIF NORTH ABOUT PASSAGE 1958 3 31 10 18 -1 -1 -1 -1 -1 -1 421.TIF IN ICE COVERED AREAS 1958 3 31 -1 -1 BK -1 -1 -1 -1 -1 -1 421.TIF SOUTH CHANNEL (CUT) 1958 4 7 -1 -1 IP -1 -1 BK -1 -1 -1 -1 422.TIF FOR 6Mi IN SOUTH CHANNEL 1958 4 7 -1 -1 OW -1 -1 BV -1 -1 -1 -1 422.TIF NORTH ABOUT PASSAGE 1959 3 2 28 -1 CL -1 -1 SC -1 -1 -1 -1 424.TIF 1959 3 9 -1 -1 SO -1 -1 -1 -1 -1 -1 425.TIF TO WEST OF POES REEF 1959 3 16 -1 -1 SO -1 -1 SC -1 -1 -1 -1 426.TIF ENTIRE LENGTH 1959 4 13 16 -1 RT -1 -1 -1 -1 -1 -1 431.TIF ALONG SHORE 1959 4 13 -1 -1 BK -1 -1 -1 -1 -1 -1 431.TIF THROUGH ALL CHANNELS (CUT) 1959 4 20 -1 -1 LI -1 -1 DI -1 -1 -1 -1 432.TIF BOTH CHANNELS 1959 4 20 -1 -1 FD -1 -1 BK -1 -1 -1 -1 432.TIF FROM BRIDGE: WESTWARD 1960 3 7 1 18 CL -1 -1 IN -1 -1 -1 -1 434.TIF ENTIRE LENGTH 1960 3 14 18 19 SC -1 -1 IN -1 -1 -1 -1 435.TIF ENTIRE LENGTH 1960 3 21 1 19 DI -1 -1 BV -1 -1 SW -1 -1 436.TIF EASTWARD INTO LAKE HURON 1960 3 28 -1 -1 HF -1 -1 -1 -1 -1 -1 437.TIF 1960 4 4 -1 -1 LF -1 -1 RT -1 -1 -1 -1 438.TIF 1960 4 11 -1 -1 SO -1 -1 -1 -1 -1 -1 439.TIF 14 FOOT SHOALS: W TO RR FERRY 1960 4 11 -1 -1 HF -1 -1 -1 -1 -1 -1 439.TIF BRIDGE: W TO NEAR WHITE SHOAL 1961 2 27 -1 -1 WI -1 -1 -1 -1 -1 -1 440.TIF SOUTH CHANNEL 1961 2 27 12 24 CL -1 -1 -1 -1 -1 -1 440.TIF IN BAYS 1961 2 27 12 -1 CL -1 -1 -1 -1 SW -1 -1 440.TIF BRIDGE: WESTWARD 1961 3 6 1 20 CL -1 -1 RT -1 -1 -1 -1 441.TIF 1961 3 6 -1 -1 SO -1 -1 -1 -1 -1 -1 441.TIF SOUTH CHANNEL: TO RR FERRY 1961 3 6 -1 -1 OW -1 -1 BV -1 -1 -1 -1 441.TIF 14 FOOT SHOALS: INTO L. HURON 1961 3 13 -1 -1 OW -1 -1 -1 -1 -1 -1 442.TIF 14 FOOT SHOALS: TO LAKE HURON 1961 3 13 -1 -1 SO -1 -1 -1 -1 -1 -1 442.TIF SOUTH CHANNEL: FOR 14Mi 1961 3 13 18 -1 SO -1 -1 SW -1 -1 -1 -1 442.TIF WEST END 1961 3 20 -1 -1 DI -1 -1 NI -1 -1 -1 -1 443.TIF 14 FOOT SHOALS: INTO L. HURON 1961 3 20 -1 -1 SO -1 -1 -1 -1 -1 -1 443.TIF S CHANNEL: TO 3Mi E OF MACK. B 1961 3 20 1 20 SO -1 -1 -1 -1 -1 -1 443.TIF MACKINAC BR: W TO WHITE SHOAL 1961 3 27 -1 -1 SO -1 -1 -1 -1 -1 -1 444.TIF SOUTH CHANNEL: FOR 12Mi 1961 3 27 1 16 -1 -1 -1 -1 -1 -1 444.TIF IN BAYS 1961 4 3 -1 -1 BK -1 -1 DI -1 -1 -1 -1 445.TIF SOUTH CHANNEL 1961 4 10 -1 -1 SO -1 -1 -1 -1 -1 -1 446.TIF CECIL BAY 1961 4 10 -1 -1 OW -1 -1 -1 -1 -1 -1 446.TIF ALL PASSAGES & CHANNELS 1961 4 10 -1 -1 LF -1 -1 DI -1 -1 -1 -1 446.TIF ALONG SHORE 1962 3 5 1 28 SO -1 -1 CL -1 -1 WI -1 -1 448.TIF ENTIRE LENGTH 1962 3 12 1 28 -1 -1 -1 -1 -1 -1 449.TIF ENTIRE LENGTH: INTO BOTH LAKES 1962 3 19 1 28 SO -1 -1 CL -1 -1 RT -1 -1 450.TIF ENTIRE LENGTH 1962 3 19 10 30 WI -1 -1 -1 -1 -1 -1 450.TIF BRIDGE: TO ROUND ISLAND 1962 3 26 1 24 SO -1 -1 CL -1 -1 BV -1 -1 451.TIF ENTIRE LENGTH: INTO BOTH LAKES 1962 4 2 -1 -1 OW -1 -1 -1 -1 -1 -1 452.TIF 14 FOOT SHOALS: INTO L. HURON 1962 4 2 -1 -1 IP -1 -1 -1 -1 -1 -1 452.TIF ENTIRE LENGTH 1962 4 8 -1 -1 -1 -1 -1 -1 -1 -1 455.TIF PORT OPENING 1962 4 9 -1 -1 SO -1 -1 -1 -1 -1 -1 453.TIF S CHANNEL 1962 4 16 -1 -1 SO -1 -1 -1 -1 -1 -1 454.TIF FOR 8MI IN SOUTH CHANNEL 1962 4 23 -1 -1 OW -1 -1 -1 -1 -1 -1 455.TIF S CHANNEL 1962 4 23 -1 -1 DI -1 -1 -1 -1 -1 -1 455.TIF BRIDGE: TO NEAR WHITE SHOAL 1963 3 4 12 30 FD -1 -1 CL -1 -1 -1 -1 457.TIF BRIDGE TO WHITE SHOAL 1963 3 11 30 -1 SO -1 -1 WI -1 -1 -1 -1 458.TIF ENTIRE LENGTH: INTO BOTH LAKES 1963 3 11 30 -1 CL -1 -1 -1 -1 WI -1 -1 458.TIF BRIDGE: WESTWARD 1963 3 18 -1 -1 SO -1 -1 WI -1 -1 -1 -1 459.TIF ENTIRE LENGTH 1963 3 18 -1 -1 FS -1 -1 IJ -1 -1 WI 6 -1 459.TIF BRIDGE TO LANSING SHOAL 1963 3 25 30 -1 SO -1 -1 WI -1 -1 -1 -1 460.TIF ENTIRE LENGTH: INTO BOTH LAKES 1963 4 1 20 -1 SO -1 -1 RT -1 -1 -1 -1 461.TIF ENTIRE LENGTH 1963 4 8 -1 -1 SW -1 -1 -1 -1 -1 -1 462.TIF BRIDGE TO MCGULPINS POINT 1963 4 8 -1 -1 SO -1 -1 -1 -1 -1 -1 462.TIF MCGULPINS PT: INTO L. MICHIGAN 1963 4 8 2 28 FS -1 -1 RT -1 -1 PR -1 -1 462.TIF STRAITS BRIDGE TO LANSING SH. 1963 4 15 -1 -1 SO -1 -1 -1 -1 -1 -1 463.TIF FOR 3Mi IN SOUTH CHANNEL 1963 4 15 -1 -1 HF -1 -1 RT -1 -1 -1 -1 463.TIF 3Mi W OF BRIDGE W TO ST. HELEN 1963 4 15 -1 -1 -1 -1 -1 -1 -1 -1 464.TIF PORT OPENING 1964 3 2 -1 -1 DI -1 -1 -1 -1 -1 -1 466.TIF S CHANNEL: FOR 9Mi E OF BRIDGE 1964 3 2 -1 -1 SO -1 -1 DI -1 -1 BV -1 -1 466.TIF BRIDGE: W TO WHITE SHOAL 1964 3 2 2 16 HF -1 -1 DI -1 -1 CL -1 -1 466.TIF 1964 3 9 -1 -1 DI -1 -1 -1 -1 -1 -1 467.TIF N CHANNEL 1964 3 9 1 16 CL -1 -1 -1 -1 -1 -1 467.TIF 1964 3 9 -1 -1 DI -1 -1 -1 -1 -1 -1 467.TIF BRIDGE: W TO ST. HELENA ISLAND 1964 3 9 -1 -1 LI -1 -1 -1 -1 -1 -1 467.TIF S CHANNEL 1964 3 16 -1 -1 LF -1 -1 -1 -1 -1 -1 468.TIF N & S CHANNELS 1964 3 16 -1 -1 DI -1 -1 SW -1 -1 -1 -1 468.TIF BRIDGE: TO 5Mi W OF ST. HELENA 1964 3 18 -1 -1 -1 -1 -1 -1 -1 -1 472.TIF PORT OPENING 1964 3 23 -1 -1 DI -1 -1 -1 -1 -1 -1 469.TIF S CHANNEL (60% ICE COVER) 1964 3 23 -1 -1 HF -1 -1 -1 -1 -1 -1 469.TIF FROM 3 TO 4Mi W OF BRIDGE 1964 3 30 -1 -1 IP -1 -1 SW -1 -1 -1 -1 470.TIF FROM BRIDGE: W TO WHITE SHOAL 1964 3 30 -1 -1 DI -1 -1 SW -1 -1 -1 -1 470.TIF E OF BRIDGE (50% ICE COVER) 1964 3 30 -1 -1 DI -1 -1 SW -1 -1 -1 -1 470.TIF N & S CHANNELS 1964 4 6 -1 -1 DI -1 -1 SW -1 -1 -1 -1 471.TIF BRIDGE TO NEAR CHEBOYGAN 1964 4 6 -1 -1 DI -1 -1 -1 -1 -1 -1 471.TIF S SHORE 1964 4 6 -1 -1 OW -1 -1 BV -1 -1 -1 -1 471.TIF E OF CHEBOYGAN: INTO L HURON 1964 4 13 -1 -1 DI -1 -1 -1 -1 -1 -1 472.TIF S CHANNEL (1/3 ICE COVER) 1965 2 23 -1 -1 SO -1 -1 -1 -1 -1 -1 473.TIF 1965 3 1 1 18 CL -1 -1 -1 -1 -1 -1 474.TIF MOST OF STRAITS 1965 3 15 15 18 SO -1 -1 -1 -1 -1 -1 476.TIF 1965 3 22 -1 -1 SO -1 -1 -1 -1 -1 -1 477.TIF S CHANNEL 1965 3 22 -1 -1 OW -1 -1 -1 -1 -1 -1 477.TIF BRIDGE: TO NEAR MACKINAC ISL. 1965 3 22 -1 -1 OW -1 -1 -1 -1 -1 -1 477.TIF BRIDGE: TO 5Mi W 1965 3 22 1 30 CL -1 -1 SC -1 -1 SW -1 -1 477.TIF 1965 3 29 -1 -1 NI -1 -1 -1 -1 -1 -1 478.TIF 1965 3 29 -1 -1 -1 -1 -1 -1 -1 -1 482.TIF PORT OPENING 1965 4 5 -1 -1 SO -1 -1 -1 -1 -1 -1 479.TIF S CHANNEL 1965 4 5 -1 -1 DI -1 -1 BV -1 -1 -1 -1 479.TIF E OF POES REEF: INTO L HURON 1965 4 5 -1 -1 SO -1 -1 BV -1 -1 -1 -1 479.TIF BRIDGE: W INTO L MICHIGAN 1965 4 12 -1 -1 SO -1 -1 BV -1 -1 SW -1 -1 480.TIF BRIDGE: WESTWARD 1965 4 12 -1 -1 SO -1 -1 -1 -1 -1 -1 480.TIF S CHANNEL: FOR 12Mi 1965 4 19 -1 -1 SO -1 -1 -1 -1 -1 -1 481.TIF S CHANNEL: FOR 10Mi 1965 4 19 -1 -1 SO -1 -1 DI -1 -1 SW -1 -1 481.TIF W INTO LAKE MICHIGAN 1965 4 26 -1 -1 OW -1 -1 -1 -1 -1 -1 482.TIF 1966 2 28 16 -1 CL -1 -1 -1 -1 -1 -1 483.TIF BAYS & HARBORS 1966 3 7 -1 -1 SO -1 -1 -1 -1 -1 -1 484.TIF 14 FOOT SHOALS: TO 12Mi WEST 1966 3 7 -1 -1 DI -1 -1 SO -1 -1 BV -1 -1 484.TIF BRIDGE: INTO L. MICHIGAN 1966 3 7 -1 -1 DI -1 -1 -1 -1 -1 -1 484.TIF INTO LAKE HURON 1966 3 14 -1 -1 DI -1 -1 WI -1 -1 BV -1 -1 485.TIF W OF BRIDGE 1966 3 14 -1 -1 SO -1 -1 -1 -1 -1 -1 485.TIF FOR 8Mi MIDWAY THRU S CHANNEL 1966 3 21 -1 -1 LI -1 -1 DI -1 -1 -1 -1 486.TIF 1966 3 28 -1 -1 OW -1 -1 -1 -1 -1 -1 487.TIF EXCEPT ALONG SHORES 1966 3 28 -1 -1 LF -1 -1 -1 -1 -1 -1 487.TIF ALONG SHORES 1966 4 1 -1 -1 -1 -1 -1 -1 -1 -1 484.TIF ANTICIPATED PORT OPENING 1966 4 4 -1 -1 OW -1 -1 -1 -1 -1 -1 488.TIF EXCEPT ALONG SHORE 1966 4 4 -1 -1 LI -1 -1 -1 -1 -1 -1 488.TIF ALONG SHORE 1967 2 27 12 20 SO -1 -1 SC -1 -1 WI -1 -1 489.TIF ENTIRE LENGTH: INTO BOTH LAKES 1967 3 6 -1 -1 SO -1 -1 WI -1 -1 -1 -1 490.TIF W OF POES REEF 1967 3 6 -1 -1 DI -1 -1 SW -1 -1 -1 -1 490.TIF E OF POES REEF 1967 3 13 -1 -1 SO -1 -1 -1 -1 -1 -1 491.TIF L. MICHIGAN TO POES REEF 1967 3 20 -1 -1 SO -1 -1 -1 -1 -1 -1 492.TIF W OF POES REEF 1967 3 20 -1 -1 DI -1 -1 -1 -1 -1 -1 492.TIF E OF POES REEF 1967 4 3 -1 -1 SO -1 -1 RT -1 -1 -1 -1 494.TIF CHEBOYGAN: INTO LAKE MICHIGAN 1967 4 10 5 10 DI -1 -1 RT -1 -1 -1 -1 495.TIF (40% ICE COVER) 1967 4 13 -1 -1 -1 -1 -1 -1 -1 -1 490.TIF ANTICIPATED PORT OPENING 1967 4 17 -1 -1 OW -1 -1 -1 -1 -1 -1 496.TIF ALL CHANNELS 1967 4 17 3 6 DI -1 -1 -1 -1 -1 -1 496.TIF BRIDGE: TO MACKINAC ISLAND 1967 4 17 3 6 DI -1 -1 -1 -1 -1 -1 496.TIF N SHORE: W OF BRIDGE 1968 2 26 20 -1 SO -1 -1 WI 1 40 -1 -1 521.TIF BOIS BLANC LT. TO BOULDER REEF 1968 3 4 -1 -1 SO -1 -1 FS -1 -1 -1 -1 520.TIF BOIS BLANC LT. TO GULL ISLAND 1968 3 4 -1 -1 OW -1 -1 -1 -1 -1 -1 520.TIF N SHORE: W OF POINT PATTERSON 1968 3 11 19 36 SO -1 -1 WI -1 72 -1 -1 497.TIF 1968 3 18 14 36 FS -1 -1 CL -1 -1 -1 -1 498.TIF POES REEF: W TO LANSING SHOAL 1968 3 25 -1 -1 SO -1 -1 FS -1 -1 WI -1 7 499.TIF 0 POES REEF TO WHITE SHOAL 1968 3 30 -1 -1 -1 -1 -1 -1 -1 -1 502.TIF PORT OPENING 1968 4 1 -1 -1 SO -1 -1 -1 -1 -1 -1 500.TIF BRIDGE: TO WHITE SHOAL 1968 4 1 -1 -1 BK -1 -1 -1 -1 -1 -1 500.TIF CHANNEL (CUT) 1968 4 8 -1 -1 OW -1 -1 -1 -1 -1 -1 501.TIF CHANNELS 1968 4 8 -1 -1 RT -1 -1 DI -1 -1 -1 -1 501.TIF ALONG SHORE 1968 4 15 -1 -1 OW -1 -1 -1 -1 -1 -1 502.TIF CHANNELS 1968 4 15 -1 -1 LF -1 -1 RT -1 -1 DI -1 -1 502.TIF EXCEPT CHANNEL AREAS 1969 2 24 10 -1 SO -1 -1 FS -1 -1 SC -1 -1 503.TIF 1969 3 3 10 -1 FS -1 -1 -1 -1 -1 -1 504.TIF 1969 3 3 -1 -1 DI -1 -1 -1 -1 -1 -1 504.TIF TO 10 TO 25Mi INTO EACH LAKE 1969 3 10 10 -1 FS -1 -1 -1 -1 -1 -1 505.TIF 1969 3 17 -1 -1 FS -1 -1 -1 -1 -1 -1 506.TIF 1969 3 21 -1 -1 -1 -1 -1 -1 -1 -1 510.TIF ICE BREAKER OPENING 1969 3 24 -1 -1 OW -1 -1 -1 -1 -1 -1 507.TIF E OF CHEBOYGAN 1969 3 24 -1 -1 FS -1 -1 WI -1 -1 -1 -1 507.TIF CHEBOYGAN TO ST. HELENS ISLE 1969 3 31 -1 -1 OW -1 -1 -1 -1 -1 -1 508.TIF CHANNEL 1969 3 31 -1 -1 DI 6 8 PN -1 -1 SW -1 -1 508.TIF 1969 4 7 -1 -1 OW -1 -1 -1 -1 -1 -1 509.TIF CHANNEL 1969 4 7 -1 -1 SO -1 -1 RT -1 -1 -1 -1 509.TIF MACKINAC CITY: W TO WHITE SH. 1969 4 14 -1 -1 IP -1 -1 -1 -1 -1 -1 510.TIF BRIDGE TO WHITE SH. (60% ICE) 1970 2 24 16 18 -1 -1 -1 -1 -1 -1 519.TIF 1970 3 10 15 20 FS -1 -1 IR -1 -1 -1 -1 511.TIF 1970 3 17 16 23 FS -1 -1 IR -1 -1 -1 -1 512.TIF 1970 3 18 -1 -1 -1 -1 -1 -1 -1 -1 518.TIF ANTICIPATED ICEBREAKER OPENING 1970 3 24 15 16 SO -1 -1 IR -1 -1 -1 -1 513.TIF 1970 3 24 -1 -1 DI -1 -1 -1 -1 -1 -1 513.TIF BOTH APPROACHES 1970 3 31 14 -1 FS -1 -1 FD -1 -1 SI -1 -1 514.TIF 1970 4 6 -1 -1 -1 -1 -1 -1 -1 -1 518.TIF ANTICIPATED NATURAL OPENING 1970 4 7 -1 -1 DI -1 -1 -1 -1 -1 -1 515.TIF CHANNEL 1970 4 7 -1 -1 SO -1 -1 -1 -1 -1 -1 515.TIF 1970 4 14 -1 -1 SO -1 -1 -1 -1 -1 -1 516.TIF FOR 7Mi IN SOUTH CHANNEL 1970 4 14 -1 -1 FD -1 -1 -1 -1 -1 -1 516.TIF W OF BRIDGE: TO WHITE SHOAL 1970 4 21 -1 -1 LI -1 -1 -1 -1 -1 -1 517.TIF ---------------------------------------------------------------------------------------------------------- Ice thickness is in inches, -1 = no thickness reported, see report for ice conditon codes. T1 = ice thickness or part of a range if T2 is present, C1 = primary condtion of ice. T1C1 = thickness of C1 or part of range if T2C1 is presnet. C2, T1C2, T2C2, C3, T1C3, T2C3 are secondary and ternary ice conditon and condition thickness.