Iowa Falls Milldam
Iowa Falls Milldam is a gravity dam located in Hardin County, Iowa, built in 1925. It carries a Significant hazard potential classification and has a fair condition assessment.
About Iowa Falls Milldam
The primary purpose of Iowa Falls Milldam is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Renewable World Energies (public utility). It impounds the Iowa River near Iowa Falls.
The dam stands 26 feet tall and stretches 225 feet across, creates a reservoir covering 365 acres, has a maximum storage capacity of 4,751 acre-feet, and collects water from a drainage area of 679 square miles. Completed in 1925, the structure is over a century old.
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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 09/27/2021.
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Location
| State | Iowa |
| County | Hardin |
| Nearest City | Iowa Falls |
| River/Stream | Iowa River |
| Coordinates | 42.51860, -93.25910 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Dam Length | 225 ft |
| Year Completed | 1925 (101 years old) |
Storage & Hydraulics
| NID Storage | 4,751 acre-ft |
| Max Storage | 4,751 acre-ft |
| Normal Storage | 4,751 acre-ft |
| Surface Area | 365 acres |
| Drainage Area | 679 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Renewable World Energies |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/27/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01304 |
| Federal ID | IA01304 |
| More Info | State Dam Safety Program |