What flashing light tells you to enter a river lock


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What should you do if you see a flashing amber light near the entrance to a river lock?

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A FLASHING AMBER LIGHT MEANS YOU SHOULD APPROACH THE LOCK UNDER FULL CONTROL. This direction is meant for boaters who are locking through a dam. When approaching a lock, the boat should produce one long whistle sound followed by one short blast at about a mile from the lock in order to let the lock operator knows that you desire lockage, then follow the traffic signal.

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