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- Q331 - Great Lakes Topics
47. Your vessel is approaching the International Bridge on the St. Mary's River. If the gage on the bridge, read from top to bottom, indicates 124 ft. and the IGLD (1955) is 600 ft., determine the actual vertical clearances between the existing water level and the lowest point of the bridge over the channel.
The bridge gage directly indicates the vertical clearance between the water surface and the lowest point of the bridge; therefore, the reading of 124 feet represents the actual clearance.
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