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120. 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 gauge reads 27.2 feet?
The gauge reading exceeded the normal pool by 15.2 feet, reducing the bridge clearance by the same amount. Therefore, the clearance is 72.6 feet — 15.2 feet = 57.4 feet.
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