Question 1510Navigation General

70% to pass

The controlling depth of the river is _______________.

A the edge of a dredged channel
B the least available water in a channel which limits the draft of boats and tows
C the highest level to which the river may rise without flooding
D the minimum depth of the river prescribed in the channel maintenance program
AI Explanation

The correct answer is B) the least available water in a channel which limits the draft of boats and tows. The controlling depth of a river refers to the minimum depth available in the navigable channel that determines the maximum draft or depth of vessels that can safely operate in that waterway. This is the key factor that limits the size and load capacity of boats and tows that can transit the river. The other options are incorrect because they do not directly address this critical navigational constraint.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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