33 CFR §162.85

1. (a)Speed. Excessive speeding is prohibited. A vessel shall reduce its speed sufficiently to prevent any damage when approaching another vessel in motion or tied up, a wharf or other structure, works under construction, plant engaged in river and harbor improvement, levees, floodwalls withstanding floodwaters, buildings submerged or partially submerged by high waters, or any other structure or improvement likely to be damaged by collision, suction, or wave action.