Mill Picayune Watershed Site M-24-7 Reservoir Report
Last Updated: December 14, 2025
Located in Shelby County, Iowa, the Mill Picayune Watershed Site M-24-7 is a dam constructed in 1972 by the USDA NRCS to serve multiple purposes including fire protection, stock watering, and small fish pond maintenance.
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Summary
With a dam height of 35 feet and a length of 725 feet, this earth dam has a storage capacity of 382 acre-feet and covers a surface area of 13.8 acres. The dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections to ensure its functionality and safety.
The dam, situated on TR-Mill Creek, is primarily used for flood risk reduction in addition to its other functions. Despite its low hazard potential, the site has a moderate risk assessment rating, indicating the need for ongoing risk management measures. The Mill Picayune Watershed Site M-24-7 has not been modified since its completion and its condition is currently not rated. With its strategic location and vital role in water resource management, this site is a key component of the local government's efforts to protect and sustainably utilize water resources in the area.
Managed by the Natural Resources Conservation Service, this dam plays a crucial role in water conservation and management in the region. Its presence ensures the availability of water for various uses while also reducing the risk of flooding in the surrounding areas. With its regulated status and regular inspections, the Mill Picayune Watershed Site M-24-7 stands as a testament to responsible water resource management and the importance of infrastructure in mitigating climate-related risks.
Year Completed |
1972 |
Dam Length |
725 |
Dam Height |
35 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
13.8 |
Drainage Area |
2.05 |
Nid Storage |
382 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
Maple River At Mapleton
|
323cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
West Nishnabotna River At Hancock
|
154cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Mill Picayune Watershed Site M-24-7