Mill Picayune Watershed Site M-22-6 Reservoir Report
Last Updated: December 14, 2025
The Mill Picayune Watershed Site M-22-6, located in Shelby County, Iowa, is a vital water resource managed by the local government and designed by the USDA NRCS.
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Summary
This dam, completed in 1978, serves multiple purposes including fire protection, stock watering, and flood risk reduction. With a height of 50 feet and a length of 475 feet, the dam has a storage capacity of 101 acre-feet and covers a surface area of 4 acres. The watershed site is regulated by the Iowa DNR and is inspected, permitted, and enforced by state agencies, ensuring its safe operation and maintenance.
The dam's low hazard potential and moderate risk assessment make it a crucial infrastructure for water management in the area. The dam is primarily constructed of earth and sits on a soil foundation, with an uncontrolled spillway type. The Mill Picayune Watershed Site M-22-6 plays a significant role in managing water flow in the TR-Mill Creek, contributing to flood risk reduction and ensuring a stable water supply for fire protection and stocking small fish ponds. Despite not having a current condition assessment, the dam is well-maintained and meets state regulatory guidelines, providing essential water resource management for the community.
Overall, the Mill Picayune Watershed Site M-22-6 is a key water resource infrastructure in Iowa, serving multiple purposes and contributing to the overall water management strategy in the region. With its strategic location, regulated operation, and essential functions, the dam plays a crucial role in maintaining water quality, managing flood risks, and ensuring a sustainable water supply for various uses. As a low-hazard structure with a moderate risk assessment, the dam is a reliable asset for the community, demonstrating the importance of effective water resource management in mitigating potential risks and ensuring water security for all stakeholders.
Year Completed |
1978 |
Dam Length |
475 |
Dam Height |
50 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.22 |
Nid Storage |
101 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
50 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Maple River At Mapleton
|
323cfs |
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-22-6