Its principal feature is Brookline Reservoir, formerly an element of the public water supply for neighboring Boston.

[1] The architectural significance of the gatehouse and its status as the best-preserved element of the Cochituate Aqueduct were recognized in its designation as a National Historic Landmark in 2015.

At the western end of the reservoir stands the Influent Gatehouse, the endpoint of the Cochituate Aqueduct.

The walls were plastered, and there were stairs, constructed of wrought iron, which were used to reach a platform giving a view of the water.

These staircases are believed to the oldest surviving example of wrought iron stairs intended for public use in the United States.