Mississippi River Lock and Dam 20
Missouri, Adams County, Mississippi River
Location
| State | Missouri |
| County | Adams |
| River | Mississippi River |
| Coordinates | 40.14410, -91.51066 |
Physical Characteristics
| NID Height | 37 ft |
| Dam Height | - |
| Dam Length | 2,604 ft |
| NID Storage | 58,000 acre-ft |
| Max Storage | 58,000 acre-ft |
| Surface Area | 7,542 acres |
Safety Classification
| Hazard Potential | Significant |
| Condition Assessment | Not Available |
| EAP Status | Yes |
| Last Inspection | June 9, 2026 |
| Inspection Frequency | 5 |
Dam Information
| Year Completed | 1936 |
| Primary Purpose | Navigation |
| Dam Type | Concrete |
| Owner Type | Federal |
| Owner | USACE - Rock Island District |
| Other Name | Pool 20 |
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.