At McAlpine L & D, normal upper pool elevation is 420.0 feet (130.8 meters) MSL, equal to 12.0 feet (3.7 meters) on the upper gage. The vertical clearance at the Clark Memorial Highway bridge is 72.6 feet (22.1 meters) above normal pool. What is the clearance if the gage reads 10.6 feet (3.2 meters)?
Official USCG Answer & Rule Citation
Correct Answer: Option A — 74.0 feet (22.6 meters)
Under USCG National Maritime Center examination standards, the accepted correct answer is: 74.0 feet (22.6 meters).
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