Department of Public Works. Williamsbridge Reservoir Keeper's House. Douglas Smyth, Architect. Southwest elevation. Unexecuted design for the Keeper's House at Williamsbridge Reservoir in the Bronx, ca. 1880s. The Keeper's House that did get built (1889-1890) was associated with the Bronx and Byram Rivers water system and is still standing. It was designated a New York City Landmark in 2000 and was listed on the State and National Registers of Historic Places in 1999.