Tridelphia Lake, northcentral Maryland
Tridelphia Lake is impounded by Brighton Dam on the Patuxent River in Montgomery County, Maryland and is used for drinking water, hydroelectric power and recreation purposes. It was built in 1943. At normal levels it has a surface area of 1.3 square miles. It is owned by Washington Suburban Sanitary Comission.
Brighton Dam, also known as Tridelphia Lake Dam is concrete, buttress supported. The core is concrete. The foundation is rock. Though originally completed in 1943, the structure was modified in 1999. Its height is 80 feet with a length of 995 feet. Maximum discharge is 83000 cubic feet per second. Its capacity is 27000 acre feet. Normal storage is 19000 acre feet. It drains an area of 77.3 square miles.
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