| Liberty Reservoir | |
|---|---|
 Aerial view of Liberty Reservoir | |
  Liberty Reservoir  Liberty Reservoir | |
| Location | Baltimore / Carroll counties, near Eldersburg, Maryland |
| Coordinates | 39°25′04″N 76°52′44″W / 39.417895°N 76.878891°W |
| Type | reservoir |
| Primary inflows | North Branch Patapsco River |
| Primary outflows | North Branch Patapsco River |
| Basin countries | United States |
| Surface area | 4.73 sq mi (1,225 hectares) |
| Average depth | 59 ft (18 m) |
| Max. depth | 144 ft (44 m) |
| Water volume | 43×109 US gal (160,000,000 m3) |
| Surface elevation | 410 ft (120 m) (dam crest) |
| Website | www |
Liberty Reservoir is a reservoir west of Baltimore, Maryland; about a mile north of Patapsco Valley State Park's McKeldin area. It is owned by the City of Baltimore Department of Public Works, but is located outside the city, and it divides Baltimore and Carroll Counties.