If the water is deep enough that light does not penetrate to the bottom, and photosynthesis is limited to the top layer, the body of water is considered a lake. A pond is a body of water shallow enough to support rooted plants. Infoplease

Chatfield Hollow State Park is a public recreation area lying adjacent to Cockaponset State Forest in the town of Killingworth, Connecticut. The state park offers hiking trails, a swimming beach, trout fishing, mountain biking, rock climbing, and picnicking areas. Park attractions include Indian caves, historic sites, a restored water wheel, and a reproduction covered bridge.

The park was developed in the 1930s as a Civilian Conservation Corps recreation area within Cockaponset State Forest.[4] The CCC created seven-acre Schreeder Pond in 1934 by building a horseshoe-shaped earth and stone dam across Chatfield Hollow Brook. In 1937, Oak Lodge was raised on the west side of Schreeder Pond; the lodge was listed on the National Register of Historic Places in 1986.[5] Wikipedia