The area includes water-supply-related structures from three phases of development of the Greater Boston water supply system.

There is a gate chamber, designed by Wheelwright & Haven, located on the dam north of the spillway.

[2] A storehouse, located just northeast of the dam, was built in 1900 to house wooden stop planks used to regulate flow.

Built in 1903, it was designed by Shepley, Rutan and Coolidge to harmonize with the existing gate house.

The second bridge, a single-arch span made of similar materials, carries an access road over the open channel to the Weston Aqueduct head house, and was built in 1902–03.