How should you approach a bridge when under power?

Approaching a bridge under power at a slow speed is the safest and most prudent choice. This method allows for better control of your vessel, which is crucial in navigating under a structure with potential hazards such as strong currents, low clearance, or unexpected obstacles. Slowing your speed gives you more time to observe any changes in the environment and helps you respond effectively to other boaters or navigation signals.

Additionally, approaching at a slow speed reduces the risk of collisions with the bridge itself or other vessels that may be in the vicinity. If there are currents or turbulence caused by the structure, a slower speed enables you to maneuver more easily and adjust your course as needed.

The other options, such as approaching at high speed, could lead to a loss of control or difficulties in responding to unexpected situations. Approaching perpendicular to the current may not be feasible depending on currents and your location, and having the engine off would leave you without steering control, increasing the risk of an accident.