Question 383Navigation General70% to pass
Illustration D037NG below represents a movable dam. If there is high water and the wickets are down so that there is an unobstructed navigable pass through the dam, what light(s) will be shown at D if the lock walls and piers are not awash?
AI Explanation
The correct answer is C) One red light.
When a movable dam has its wickets down and there is an unobstructed navigable pass through the dam, and the lock walls and piers are not awash, the lights to be shown at the dam are one red light, per the U.S. Aids to Navigation System. The red light indicates that the dam is closed to navigation and the passage is open. The other answer choices are incorrect because they do not match the regulation for the specific scenario described.
Related Questions
#381 You are approaching a swing bridge at night. You will know that the bridge is open for river traffic when _______________.#382 Illustration D036NG below represents a fixed C of E lock and dam. What navigational light(s) is(are) exhibited at the position indicated by the letter D? #384 What lights would you see on the Illinois water way when any wickets of the dam or bear traps are open, or partially open, which may cause a set in the current conditions in the upper lock approach? #385 The white lights in a vertical line on a multiple-span bridge indicate _______________.#386 You are approaching a vertical lift bridge. You know the span is fully open when _______________.