Deck : General Navigation - 40/2138
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| 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? |
| A) 60.6 feet |
| B) 25.4 feet |
| C) 57.4 feet |
| D) 72.6 feet |
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| How does one figure out this problem and then get the answer to it? Essentially asking, how is a problem like this solved? |
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| To calculate bridge clearance, start with the normal pool elevation of 12.0 feet on the gage, which gives a 72.6-foot clearance. If the gage reads 27.2 feet, the water level is 15.2 feet higher than normal (27.2 − 12.0) App download link. Subtracting this from the normal clearance: 72.6 − 15.2 = 57.4 feet of vertical clearance. |