Mill Picayune Watershed Site M-24-4 Reservoir Report
Last Updated: December 15, 2025
Located in Shelby, Iowa, the Mill Picayune Watershed Site M-24-4 is a local government-owned dam with a primary purpose of fire protection, stock, or small fish pond.
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Summary
Built in 1963 by USDA NRCS, this earth dam stands at a height of 51 feet and has a storage capacity of 59 acre-feet. With a low hazard potential and a moderate risk assessment score of 3, this dam plays a crucial role in flood risk reduction in the area.
Situated on TR-Mill Creek, this dam covers a drainage area of 0.24 square miles and has a surface area of 1.9 acres. Although it has not been inspected recently, the dam is regulated by the Iowa DNR and meets state permitting, inspection, and enforcement requirements. Despite its uncontrolled spillway type, the Mill Picayune Watershed Site M-24-4 serves as a vital resource for water management in the region and plays a key role in maintaining the ecological balance of the area.
With its strategic location and capacity for water storage, the Mill Picayune Watershed Site M-24-4 serves as a valuable asset for the community of Manteno, offering protection against flooding and supporting local wildlife habitats. As climate enthusiasts and water resource advocates, it is essential to recognize the significance of this dam in preserving the natural environment and enhancing the resilience of the region in the face of changing climate patterns.
Year Completed |
1963 |
Dam Length |
650 |
Dam Height |
51 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
1.9 |
Drainage Area |
0.24 |
Nid Storage |
59 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
51 |
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-24-4