GREAT LAKES ENVIRONMENTAL RESEARCH LABORATORY, NOAA Climate Data Modernization Project
 National Weather Service Historical Great Lakes Ice Reports for Winters 1899 - 1970

 Site No. 109, Approximate Location: 46.18 N. Latitude, 84.15 W. Longitude
 Site Name  Birch Point                    on St. Marys River   
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 Year Mo Da   T1   T2   C1  T1C1 T2C1  C2  T1C2 T2C2  C3 T1C3 T2C3  IMAGE   Supplemental Information
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 1947  3 31   19   -1        -1   -1        -1   -1       -1   -1  330.TIF   BIRCH POINT RANGE CHANNEL       
 1947  4  7   18   20   SO   -1   -1        -1   -1       -1   -1  331.TIF   BIRCH POINT CHANNEL             

 1948  3  1   20   -1        -1   -1        -1   -1       -1   -1  334.TIF   CHANNEL                         
 1948  4  5   -1   -1   OW   -1   -1        -1   -1       -1   -1  339.TIF   BIRCH POINT TO LOCKS            

 1953  3  9   14   -1        -1   -1        -1   -1       -1   -1  377.TIF   CHANNEL                         
 1953  3 16   13   -1   WT   -1   -1        -1   -1       -1   -1  378.TIF   CHANNEL                         

 1955  3  7   12   -1   CL   -1   -1   SC    3   -1       -1   -1  391.TIF                                   
 1955  3 14    6   -1   CL   -1   -1   SC    2   -1       -1   -1  393.TIF                                   
 1955  3 14   15   -1   CL   -1   -1   SC    3   -1       -1   -1  393.TIF   COAST GUARD DISPATCH STATION    
 1955  3 14   18   -1        -1   -1        -1   -1       -1   -1  393.TIF   CAN. CANAL: 1000FT E OF LOCK    
 1955  3 14   22   -1        -1   -1        -1   -1       -1   -1  393.TIF   CAN. CANAL: 2000FT W OF LOCK    
 1955  3 28    8   -1   SC   10   14        -1   -1       -1   -1  395.TIF                                   
 1955  4 11   -1   -1   LI   -1   -1   FD   -1   -1   RT  -1   -1  396.TIF   TO LOCKS                        

 1957  4  1   20   -1        -1   -1        -1   -1       -1   -1  414.TIF                                   

 1961  3 20   -1   -1   OW   -1   -1        -1   -1       -1   -1  443.TIF   LANE IN CHANNEL: TO LOCKS       

 1962  2 26    4   12   CL   -1   -1   SC   12   -1       -1   -1  447.TIF                                   
 1962  3 12    6   28   SC   -1   -1        -1   -1       -1   -1  449.TIF                                   

 1968  4  1    4   20        -1   -1        -1   -1       -1   -1  500.TIF   BIRCH LOCKS (50% ICE COVER)     
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 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.