Nodaway Lake Dam
Nodaway Lake Dam is an earth dam located in Adair County, Iowa, built in 1936. It carries a Significant hazard potential classification and has a fair condition assessment.
About Nodaway Lake Dam
The primary purpose of Nodaway Lake Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Greenfield Municipal Utilities (local government). It impounds the Tr-middle Nodaway River near Mt. Etna.
The dam stands 35 feet tall and stretches 650 feet across, creates a reservoir covering 27 acres, has a maximum storage capacity of 550 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1936, 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 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 05/24/2021.
At 35 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Iowa |
| County | Adair |
| Nearest City | Mt. Etna |
| River/Stream | Tr-middle Nodaway River |
| Coordinates | 41.28980, -94.49800 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 35 ft |
| Dam Height | 35 ft |
| Dam Length | 650 ft |
| Year Completed | 1936 (90 years old) |
Storage & Hydraulics
| NID Storage | 550 acre-ft |
| Max Storage | 550 acre-ft |
| Normal Storage | 290 acre-ft |
| Surface Area | 27 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Greenfield Municipal Utilities |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/24/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01331 |
| Federal ID | IA01331 |
| More Info | State Dam Safety Program |