Mill Picayune Watershed Site M-24-5 Reservoir Report
Last Updated: December 14, 2025
Located in the picturesque Shelby County, Iowa, the Mill Picayune Watershed Site M-24-5 is a local government-owned earth dam completed in 1963 with a primary purpose of fire protection, stock, or small fish pond.
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Summary
Spanning a surface area of 2.8 acres and holding a maximum storage capacity of 57 acre-feet, this dam on TR-Mill Creek serves multiple functions including flood risk reduction. Managed by the Iowa Department of Natural Resources, this structure is regulated, permitted, inspected, and enforced by state authorities to ensure its safety and compliance with regulations.
With a height of 51 feet and a length of 495 feet, the Mill Picayune Watershed Site M-24-5 has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. Despite the moderate risk level (rating of 3), the dam has not been modified in recent years and has no emergency action plan in place. While the structure does not have any associated locks or spillways, its uncontrolled spillway type ensures adequate water discharge during high flow events. As an essential component of the local water resource management system, this dam plays a critical role in safeguarding the surrounding area from potential flooding and providing valuable water storage for various purposes.
Year Completed |
1963 |
Dam Length |
495 |
Dam Height |
51 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
2.8 |
Drainage Area |
0.15 |
Nid Storage |
57 |
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-24-5