Prairie Rose Lake Dam
Prairie Rose Lake Dam is an earth dam located in Shelby County, Iowa, built in 1960. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Prairie Rose Lake Dam
The primary purpose of Prairie Rose Lake 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-east Br West Nishnabota near Avoca.
The dam stands 55 feet tall and stretches 950 feet across, creates a reservoir covering 200 acres, has a maximum storage capacity of 6,824 acre-feet, and collects water from a drainage area of 6 square miles. Completed in 1960, the structure is well into its service life at over 50 years 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 10/04/2021.
At 55 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Iowa |
| County | Shelby |
| Nearest City | Avoca |
| River/Stream | Tr-east Br West Nishnabota |
| Coordinates | 41.60030, -95.22850 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 55 ft |
| Dam Height | 55 ft |
| Dam Length | 950 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 6,824 acre-ft |
| Max Storage | 6,824 acre-ft |
| Normal Storage | 3,602 acre-ft |
| Surface Area | 200 acres |
| Drainage Area | 6 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 | 10/04/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01008 |
| Federal ID | IA01008 |
| More Info | State Dam Safety Program |