Great Falls Dam, Lock No. 20
Maryland — Montgomery County — C&O Canal
Location
| State | Maryland |
| County | Montgomery |
| River | C&O Canal |
| Coordinates | 39.00169, -77.24927 |
Physical Characteristics
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | — |
| NID Storage | 51 acre-ft |
| Max Storage | 51 acre-ft |
| Surface Area | — |
Safety Classification
| Hazard Potential | Low |
| Condition Assessment | — |
| EAP Status | No |
| Last Inspection | September 30, 1996 |
| Inspection Frequency | — |
Dam Information
| Year Completed | 1850 |
| Primary Purpose | Navigation |
| Dam Type | Masonry |
| Owner Type | Federal |
| Owner | US Army Corps of Engineers,Washington Aqueduct Div |
| Other Name | C&O Canal, Great Falls Tavern, Mollys Wall |
Location Map
About This Dam Record
Dam safety data is maintained by the Army Corps of Engineers National Inventory of Dams (NID). High-hazard dams are those where failure could cause loss of life or major property damage downstream.