Mill Picayune Watershed Site M-21-5
Mill Picayune Watershed Site M-21-5 is an earth dam located in Shelby County, Iowa, built in 1980. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Mill Picayune Watershed Site M-21-5
The primary purpose of Mill Picayune Watershed Site M-21-5 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 Woodbine.
The dam stands 48 feet tall and stretches 678 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 354 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1980, the structure is 46 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 09/04/2024.
At 48 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | Iowa |
| County | Shelby |
| Nearest City | Woodbine |
| River/Stream | Tr-mill Creek |
| Coordinates | 41.84470, -95.51370 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 48 ft |
| Dam Height | 48 ft |
| Dam Length | 678 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 354 acre-ft |
| Max Storage | 354 acre-ft |
| Normal Storage | 131 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 1 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 | 09/04/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA02134 |
| Federal ID | IA02134 |
| More Info | State Dam Safety Program |