Lake Keomah Dam
Lake Keomah Dam is an earth dam located in Mahaska County, Iowa, built in 1935. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Lake Keomah Dam
The primary purpose of Lake Keomah Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Iowa Department Of Natural Resources (state). It impounds the Tr-south Skunk River near Coppock.
The dam stands 42 feet tall and stretches 1,100 feet across, creates a reservoir covering 82 acres, has a maximum storage capacity of 1,710 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1935, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 06/01/2020.
At 42 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Iowa |
| County | Mahaska |
| Nearest City | Coppock |
| River/Stream | Tr-south Skunk River |
| Coordinates | 41.29560, -92.53770 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 42 ft |
| Dam Height | 42 ft |
| Dam Length | 1,100 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 1,710 acre-ft |
| Max Storage | 1,710 acre-ft |
| Normal Storage | 802 acre-ft |
| Surface Area | 82 acres |
| Drainage Area | 3 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Iowa Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/01/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00642 |
| Federal ID | IA00642 |
| More Info | State Dam Safety Program |