Hop Brook Lake is spread over three communities in New Haven County, Connecticut, United States.

The flood storage area of the project, which is normally empty and is only utilized to store floodwaters, is 1.5 miles (2.4 km) long and spreads out over 270 acres (1.1 km2).

Hop Brook Lake can store up to 2.23 billion US gallons (8,400,000 m3) of water for flood control purposes.

This is equivalent to eight inches (203 mm) of water covering its drainage area of 16.4 square miles (42 km2).

Recreational development of the reservoir includes picnic sites, walking trails, a beach, ball field, drinking water, and sanitary and parking facilities.