Little Seneca Lake is a reservoir located near the Boyds community in Montgomery County, Maryland. The lake was created by the construction of a dam on Little Seneca Creek. It was built to provide an emergency water supply for the metropolitan Washington, D.C. area, and it also provides a recreational amenity for the public. The lake is located in Black Hill Regional Park. Fishing and boating facilities are available at the park.
The lake was completed in 1984 and the water supply dam is operated by theWashington Suburban Sanitary Commission(WSSC). WSSC shares the drinking water resource with two adjacent public water suppliers, the Washington Aqueduct and theFairfax County Water Authority.
The surface area of the lake is 505 acres (2.04 km2). The average depth is 24.7 feet (7.5 m) with a maximum depth of 68 feet (21 m).The capacity of the lake is 4.5 billion gallons (17 million m3). The lake is stocked for recreational fishing. Fish species found in the lake include largemouth bass, tiger muskie, channel catfish, sunfish, andcrappie.