Which VHF channel is assigned to both the Spokane Street Bridge and Duwamish Railroad Bridge?

The correct choice identifies VHF channel 13 as the assigned channel for both the Spokane Street Bridge and the Duwamish Railroad Bridge. This channel is part of the VHF marine radio band, used for communication between marine vessels and bridges or other shore facilities.

Channel 13 specifically serves as a bridge-to-bridge communication channel, allowing for coordination and safety communications, especially in areas where navigation may be complex or where multiple vessels could be operating in close proximity. The use of a dedicated channel helps manage traffic and ensures that information regarding bridge openings or navigational hazards can be effectively communicated to vessels.

Understanding the purpose of various VHF channels is crucial for anyone involved in marine navigation or bridge operations, highlighting the importance of correctly identifying communication protocols in those environments.