What should you do when approaching a dam or lock?

When approaching a dam or lock, it is important to prioritize safety and adhere to proper protocols. Waiting at least 400 feet away for a signal is the correct approach because it ensures that you are at a safe distance while you assess the situation. This distance allows you to avoid potential hazards associated with the powerful currents and changing water levels near dams and locks. It also gives you the opportunity to receive appropriate signals or instructions from the lock operators, who are responsible for managing the safe passage of vessels through these structures.

Using an alternate route may not always be feasible or necessary, and contacting the lock operator only when docked could lead to confusion or delays in communication, which could compromise safety. Proceeding quickly could increase the risk of accidents and mishaps, as it does not allow for the necessary caution and awareness of the changing conditions near dams and locks. Therefore, maintaining a safe distance and waiting for a signal is vital for ensuring the safety of all vessels involved.