What is the least depth for the outer 550 feet at Pier 46 north berth?

The least depth for the outer 550 feet at Pier 46 north berth is 32.6 feet. This figure typically derives from hydrographic surveys or design specifications that indicate the minimum navigable depth needed to accommodate vessels that will be using the berth. Accurate depth measurements are crucial for safe docking and maneuvering of ships, particularly in a busy port environment like Seattle.

The choice of 32.6 feet reflects careful consideration of various factors, such as the draft of vessels expected to dock at the pier, water level fluctuations, and potential sedimentation that may affect navigability. Additionally, this depth ensures that vessels can safely approach and leave the berth without the risk of grounding or encountering hazards.

It's also important to understand that depth specifications are influenced by not only the operational requirements but also regulatory standards that promote safety in marine operations. Therefore, the chosen depth of 32.6 feet serves as a practical balance between operational efficiency and safety, making it the correct answer.