The 50-acre (200,000 m2) reservoir was completed in 1858 by the United States Army Corps of Engineers as part of the Washington Aqueduct project.[2] It began providing water on January 3, 1859.[3] Initially the reservoir provided water to the city from the adjacent Little Falls Branch until the aqueduct construction was completed. Regular water service from the Potomac River source through the aqueduct commenced in 1864. The reservoir was modified in 1895 and 1935 to improve water quality and increase water supply.[4]
The Capital Crescent Trail runs adjacent to the reservoir and through the center of the pumping campus. The boundary between Maryland and the District of Columbia passes through the reservoir. An historic D.C. boundary marker (Northwest No. 5) is located in a woodland east of the reservoir. Another (Northwest No. 4) is located a short distance east of the Capital Crescent Trail, near the Dalecarlia water purification facility.
The reservoir is maintained by the Washington Aqueduct division of the Army Corps of Engineers.
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