Biddeford Pool is a large tidal pool, located off Saco Bay south of the mouth of the Saco River on the south coast of Maine. It is approximately 6 miles southeast of downtown Biddeford, to which it is connected via State Route 208. The town of Kennebunkport is 3 miles southwest, connected via State Route 9.
Biddeford Pool is the site of Maine's first recorded permanent settlement, then called Winter Harbor (not to be confused with present-day Winter Harbor, Maine). In the winter of 1616-1617, Richard Vines, a physician, resided here as part of the colonization efforts of Sir Ferdinando Gorges, lord proprietor of Maine. An early village developed on the north side. In 1688, Fort Mary was built near the pool's entrance.
The former Fletcher's Neck Lifesaving Station, closed in 1971 and on the National Register of Historic Places, still stands at Ocean Avenue and Fourth Street.
During World War II the Biddeford Pool Military Reservation was established from 1941 to 1945, on what is now the Abenakee Golf Club. It had four circular concrete platforms called "Panama mounts" for 155 mm guns, three of which remain today. From December 1941 to December 1943 it was garrisoned by Battery F of the 240th Coast Artillery of the Maine National Guard; this unit was then relieved by Battery E of the 22nd Coast Artillery, which departed in October 1943; it is unclear what unit was at the site after that time.
The small harbor hosts both vacationers and lobstermen. Its water level fluctuates from a large navigable body during high tide to mostly mudflats during low tide. The only exception is the deep mouth, where a gut is located which is naturally dredged by tidal current. It is locally known as "The Gut." Consequently, this is the area where most boats are moored. Wood Island Light is located about a mile offshore to the northeast.