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- Q373 - Navigation Problems: Chart Plot
6. The highest point on your towboat is 53 feet above the water, and the Helena Gage (mile 663 AHP) reads 3.9 feet. What is the vertical clearance when you pass under the B-span of the Helena Highway Bridge in Helena?
The vertical clearance is determined by subtracting the current river stage (3.9 feet) from the charted bridge clearance (66.4 feet), resulting in a clearance of 62.5 feet.
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