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

 Site No. 489, Approximate Location: 45.25 N. Latitude, 74.13 W. Longitude
 Site Name  Valleyfield Bridge             on St. Lawrence River
 ----------------------------------------------------------------------------------------------------------
 Year Mo Da   T1   T2   C1  T1C1 T2C1  C2  T1C2 T2C2  C3 T1C3 T2C3  IMAGE   Supplemental Information
 ----------------------------------------------------------------------------------------------------------
 1962  3 26    5   -1   RT   -1   -1   BV   -1   -1       -1   -1  451.TIF                                   
 1962  4  2   -1   -1   OW   -1   -1        -1   -1       -1   -1  452.TIF   TO 2Mi NORTH                    
 1962  4  2   -1   -1   IP   -1   -1   BV   -1   -1       -1   -1  452.TIF   BEYOND 2Mi NORTH                

 1964  3  2    6   -1        -1   -1        -1   -1       -1   -1  466.TIF                                   
 1964  3  2   -1   -1   OW   -1   -1        -1   -1       -1   -1  466.TIF   UPSTREAM                        
 1964  3 23   -1   -1   IP   -1   -1   BK   -1   -1       -1   -1  469.TIF   TO 1800FT ABOVE BRIDGE          
 1964  3 23   -1   -1   OW   -1   -1        -1   -1       -1   -1  469.TIF   BEYOND 1800FT ABOVE BRIDGE      
 ----------------------------------------------------------------------------------------------------------
 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.