Report of Research, Field Investigation and Survey of Robert D ...

Further on Page 8, O.L.S. Bunker continues “Mr. Stewart also provided us with a table of
conversions between CGVD28, IGLD 1955 and IGLD 1985 for Lake Huron (Appendix G), based
on his research into the water level data provided by CHS. The table shows conversion factors
for 6 different gauging stations located around Lake Huron.
The table of conversions is copied below:
Conversion BetweenCGVD28, IGLD55 and IGLD85
For Lake Huron
Notes
• IGLD85 is a higher figure than CGVD28
• CGVD28 is a higher figure than IGLD55
Gauging Station
IGLD85-CGVD28 CGVD28-IGLD55 IGLD85-IGLD55
Metres (feet) Metres (feet) Metres (feet)
Goderich 0.031 (0.10) 0.164 (0.54) 0.195 (0.64)
Tobermory 0.140 (0.46) 0.138 ().45) 0.278 (0.91)
Collingwood 0.052 (0.17) 0.192 (0.63) 0.244 (0.80)
Parry Sound 0.119 (0.39) 0.215 (0.71) 0.334 (1.10)
Little Current 0.151 (0.50) 0.189 (0.62) 0.340 (1.12)
Thessalon 0.075 (0.25) 0.183 (0.600 0.258 (0.85)
6.5.4 Historical Great Lakes Water Level Data for Water Gauage at Harbor Beach, MI produced
by United States National Ocean and Atmosphere Administration (NOAA) (Tab 42)
This is a table listing monthly water level averages at Harbor Beach from 1860 to 2007, referred
to IGLD1985 datum. Harbor Beach is located on the western shore of Lake Huron at
approximate Latitude N43 degrees 50 minutes, roughly opposite Goderich, Ontario. It is
approximately 230km west of the site of this survey.
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