Reservoir Park is a historic park on Boylston Street in Brookline, Massachusetts. Its principal feature is Brookline Reservoir, formerly an element of the public water supply for neighboring Boston. The reservoir was built in 1848 as the main terminus of the now-defunct Cochituate Aqueduct, which delivered water from Lake Cochituate in the western suburbs. The reservoir covers 21.1acre, and is roughly kidney-shaped. A gravel path extends around the perimeter of the reservoir. The park is bounded on the north by Boylston Street (Massachusetts Route 9), on the west by Lee Street, on the south by Dudley Street, and on the east by Warren and Walnut Streets.There are two structures in the park. At the western end of the reservoir stands the Influent Gatehouse, the endpoint of the Cochituate Aqueduct. This is a modest utilitarian structure built out of dressed granite, about 11ft by 12ft and 11 feet in height. Its interior houses equipment for managing the flow of water from the aqueduct into the reservoir. The Principal Gatehouse, in contrast, is a more elaborate structure. It is located at the northeastern end of the reservoir, and is a two-story building partially buried in the embankment. It is built, like the Influent Gatehouse, of dressed granite, but was designed to be a public space. Its main facade has Renaissance Revival elements within a Greek-style temple front. The corners of the building have quoins in a paler shade of stone, and there is a course of that same stone in between the two floors. It has a gabled roof with a fully pedimented gable end, decorated with dentil stonework. The facade is three bays wide, with a centered entry on the lower level. The entry is recessed behind an arch that is flanked by round columns supporting an entablature. The entry is flanked by small elongated round-arch windows. The upper level consists of three larger equal-sized round-arch windows. The upper level of the building also has a facade facing the water; this also has three round-arch windows.
