Mississippi River Lock and Dam 21
Missouri — Adams County
Location
| State | Missouri |
| County | Adams |
| Coordinates | 39.90448, -91.42988 |
Physical Characteristics
| NID Height | 48 ft |
| Dam Height | — |
| Dam Length | 3,116 ft |
| NID Storage | 62,000 acre-ft |
| Max Storage | 62,000 acre-ft |
| Surface Area | 8,843 acres |
Safety Classification
| Hazard Potential | Significant |
| Condition Assessment | Not Available |
| EAP Status | — |
| Last Inspection | — |
| Inspection Frequency | 5 |
Dam Information
| Year Completed | 1938 |
| Primary Purpose | Navigation |
| Dam Type | — |
| Owner Type | — |
| Owner | USACE - Rock Island District |
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.