Illustration D036NG below represents a fixed...

Question 1 of 2707066636ee928f7522a1c519940

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?

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Question 1 of 27070

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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?

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🔍 Key Concepts

• Corps of Engineers (C of E) lock and dam lights on the inland rivers • Difference between lock entrance/exit limits and the dam (overflow/weir) section • How lights mark restricted or dangerous areas versus navigable lock approaches

💭 Think About

• Look at the diagram and decide whether point D is on the lock approach, inside the lock, or along the dam/overflow section • Ask yourself what kind of signal the Coast Guard and Corps would use to mark an area that vessels must not attempt to pass over at night • Compare what lights (and how many) are normally used to show a safe lock approach channel versus a closed or dangerous structure

✅ Before You Answer

• Verify in your study materials how a fixed C of E dam is lighted along the dam crest or non‑navigable portions • Confirm what color/number of lights indicate a lock gate or lock approach instead of the dam itself • Be sure whether point D in this particular sketch is at the dam face or at a lock wall/guide wall before choosing the light configuration