Other bottom types may exist in the anchorages. New London Harbor has more than 30 wharves and piers of various sizes and configurations, which are used as repair berths and for mooring recreational craft, fishing vessels, tugs, barges, ferries and government vessels. Depths alongside the various facilities range from 10 to 30 ft. Berthing at the U.S. Coast Guard Station consists of two large piers, Pier 4 and Pier 7, and other mooring facilities for small craft. The northernmost pier, Pier 7, is a 656 ft concrete pier capable of accommodating one Ohio Class submarine on its north side.
Shallower depths exist on the south side of the pier.
Pier 4 is a 555 ft long, wooden pier. Pier 4 is exposed to seas moving northward into the harbor. Pier 7 is afforded limited protection from wave motion by Pier 4. State Pier is located on the west side of the Thames River just south of the railroad bridge. The pier was previously leased and controlled by the U.S. Navy because the USS Fulton, a submarine tender, was semi-permanently moored to four concrete dolphins located just northeast of the pier.