Mill Picayune Watershed Site M-22-3 is an earth dam located in Shelby County, Iowa, built in 1978. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 37 ft37 ft tall and 550 ft long, taller than 83% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Mill Picayune Watershed Site M-22-3
The primary purpose of Mill Picayune Watershed Site M-22-3 is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Shelby County Swcd (local government). It impounds the Tr-mill Creek near Manteno.
The dam stands 37 feet tall and stretches 550 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 207 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1978, the structure is 48 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 10/11/2022.
At 37 feet, this dam is taller than 83% of dams nationwide.
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Location
| State | Iowa |
| County | Shelby |
| Nearest City | Manteno |
| River/Stream | Tr-mill Creek |
| Coordinates | 41.82430, -95.47150 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 550 ft |
| Year Completed | 1978 (48 years old) |
Storage & Hydraulics
| NID Storage | 207 acre-ft |
| Max Storage | 207 acre-ft |
| Normal Storage | 94 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Shelby County Swcd |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/11/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01988 |
| Federal ID | IA01988 |
| More Info | State Dam Safety Program |