Nashua Milldam
Nashua Milldam is a gravity dam located in Chickasaw County, Iowa, built in 1917. It carries a Significant hazard potential classification and has a fair condition assessment.
About Nashua Milldam
The primary purpose of Nashua Milldam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City Of Nashua (local government). It impounds the Cedar River near Nashua.
The dam stands 20 feet tall and stretches 1,170 feet across, creates a reservoir covering 405 acres, has a maximum storage capacity of 5,242 acre-feet, and collects water from a drainage area of 1,113 square miles. Completed in 1917, 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. An emergency action plan is in place for this dam. The most recent inspection on record was 08/31/2023.
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Location
| State | Iowa |
| County | Chickasaw |
| Nearest City | Nashua |
| River/Stream | Cedar River |
| Coordinates | 42.95520, -92.53590 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 1,170 ft |
| Year Completed | 1917 (109 years old) |
Storage & Hydraulics
| NID Storage | 5,242 acre-ft |
| Max Storage | 5,242 acre-ft |
| Normal Storage | 3,245 acre-ft |
| Surface Area | 405 acres |
| Drainage Area | 1,113 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Nashua |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 08/31/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IA01314 |
| Federal ID | IA01314 |
| More Info | State Dam Safety Program |