Johnson Dam
Iowa — Montgomery County — Unnamed Trib to Tarkio River
Location
| State | Iowa |
| County | Montgomery |
| River | Unnamed Trib to Tarkio River |
| Coordinates | 40.93290, -95.13820 |
Physical Characteristics
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 420 ft |
| NID Storage | 59 acre-ft |
| Max Storage | 59 acre-ft |
| Surface Area | 3 acres |
Safety Classification
| Hazard Potential | Low |
| Condition Assessment | — |
| EAP Status | Not Required |
| Last Inspection | — |
| Inspection Frequency | — |
Dam Information
| Year Completed | 2024 |
| Primary Purpose | Grade Stabilization |
| Dam Type | Earth |
| Owner Type | Private |
| Owner | Carl Tim & Richard Johnson |
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.