sentences:  The reservoir is located between Beacon Street and Commonwealth Avenue in Boston's Chestnut Hill district, just east of the Boston College Main Campus Historic District.The Chestnut Hill Reservoir was built between 1865 and 1870 to supplement the capacity of the Brookline Reservoir, which was then the terminus of the Cochituate Aqueduct.The Sudbury Aqueduct was completed in 1878, providing water to the reservoir from the Sudbury River in Boston's western suburbs.