Castle Gatehouse, Georgetown Reservoir - View this location on map Picturesque landmark constructed as part of turn-of-the-century improvements to the municipal water system; stands at the entry to the 4-mile water tunnel from Georgetown Reservoir to McMillan Reservoir; symbol of Army Corps contributions to city's public health; designed to resemble the 1839 insignia of the Army Corps of Engineers; built 1899-1901, restuccoed 1958 Reservoir Road and MacArthur Boulevard, NW, Washington , DC Historical

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