Mount Ayr Reservoir Dam
Mount Ayr Reservoir Dam is an earth dam located in Ringgold County, Iowa, built in 1930. It carries a Significant hazard potential classification and has a fair condition assessment.
About Mount Ayr Reservoir Dam
The primary purpose of Mount Ayr Reservoir 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 City Of Mounty Ayr (local government). It impounds the Tr-walnut Creek near Isadora, Mo.
The dam stands 40 feet tall and stretches 1,200 feet across, creates a reservoir covering 78 acres, has a maximum storage capacity of 1,410 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1930, 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 07/27/2021.
At 40 feet, this dam is taller than 87% of dams nationwide.
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Location
| State | Iowa |
| County | Ringgold |
| Nearest City | Isadora, Mo |
| River/Stream | Tr-walnut Creek |
| Coordinates | 40.74090, -94.24050 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 40 ft |
| Dam Height | 40 ft |
| Dam Length | 1,200 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 1,410 acre-ft |
| Max Storage | 1,410 acre-ft |
| Normal Storage | 780 acre-ft |
| Surface Area | 78 acres |
| Drainage Area | 4 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Mounty Ayr |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 07/27/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01370 |
| Federal ID | IA01370 |
| More Info | State Dam Safety Program |