Lake Roland is a 100‑acre (approximately 0.40 km²) artificial lake and former municipal reservoir located in Baltimore County, Maryland, United States. The water body lies just north of the Baltimore city limits at coordinates 39°23′10″N 76°38′39″W and has a surface elevation of about 246 feet (75 m). It receives inflow primarily from Jones Falls, Towson Run, and Roland Run, and its outflow continues via Jones Fall into the Northwest Branch of the Patapsco River.
The lake was created in the late 1850s when the City of Baltimore acquired the privately owned Baltimore Water Company’s holdings—including the Bellona Gunpowder Mill and Eagle Factory sites—and constructed a dam on Jones Falls, supplemented by smaller dams on Towson Run and Roland Run. Engineering work began in 1858 under James Slade of Hartford, Connecticut, with construction supervision by Charles P. Manning. By 1861 Lake Roland became Baltimore’s first municipal water supply, featuring an “indestructible” rubble‑work dam and a Greek‑Revival pump house on its eastern shore.
In the ensuing decades the lake served as part of the city’s water system but was eventually rendered obsolete by newer reservoirs and water‑treatment facilities. The reservoir is now classified as “defunct,” no longer used for municipal supply, and functions primarily as a recreational resource within Lake Roland Park—a public park established in the 1920s and administered by Baltimore County’s Department of Recreation.
Lake Roland supports diverse wildlife, including Canada geese, largemouth bass, and common carp. The surrounding historic district preserves remnants of its industrial past, such as the former Bellona Gunpowder Mill site. Historically the lake was also known as Lake Swann in honor of Mayor Thomas Swann, who oversaw early dam construction. Its name derives from Roland Run, a tributary named before 1694 after landowner Rowland (or Roland) Thornberry.
Today the lake and park provide year‑round recreational opportunities, including fishing, hiking, and educational programs, while retaining its significance as an historic landmark reflecting Baltimore’s 19th‑century water‑management infrastructure.
