At McAlpine L & D, normal upper pool elevation is 420.0 feet MSL, equal to 12.0 feet on the upper gage. The vertical clearance at the Clark Memorial Highway bridge is 72.6 feet above normal pool. What is the clearance if the gage reads 27.2 feet?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 57.4 feet
Under USCG National Maritime Center examination standards, the accepted correct answer is: 57.4 feet.
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