Physical/ Habitat Description - The North Branch of the Patapsco River is the primary tributary that feeds the reservoir. Other tributaries include Beaver Run, Keyer's Run, Prugh Run, Morgan Run, Locust Run, and Cooks Branch. Reservoir length is 18 km with a shoreline length at full pool of 131 km. The average depth is 59 ft with a maximum depth of 144 ft.

Restrictions - Boat propulsion is limited to rowing, paddling, or battery-powered motors. A seasonal permit issued by the City of Baltimore Reservoir Natural Resources Office is required prior to launching a boat in Liberty Reservoir. Shoreline fishing is permitted.

To help control the spread of invasive species, including zebra mussels, boaters on Liberty, Loch Raven, and Prettyboy Reservoirs must sign an affidavit stating their boat will be used only on these reservoirs.​

History - This 1,225 hectare (3,100 acre) impoundment was completed on July 8, 1954. It was constructed by the City of Baltimore for use as a public water supply. The dam crest is at an elevation of 126 m above sea level, and water overflowed the crest for the first time on February 6, 1956.