Mill Picayune Watershed Site M-24-16 Reservoir Report
Last Updated: December 14, 2025
The Mill Picayune Watershed Site M-24-16 in Shelby, Iowa is a vital water resource managed by the local government and regulated by the Iowa DNR.
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Summary
This earth dam, completed in 1972, serves multiple purposes including fire protection, stock, and small fish pond, as well as flood risk reduction. With a height of 45 feet and a storage capacity of 190 acre-feet, this dam plays a crucial role in managing water resources in the area.
Located in Woodbine along the TR-Mill Creek, this dam covers a surface area of 6.8 acres and has a drainage area of 0.36 square miles. Despite being classified as having a low hazard potential and a moderate risk assessment, the condition assessment is currently listed as "Not Rated." It is important for water resource and climate enthusiasts to monitor and assess the condition of this structure to ensure its continued effectiveness in managing water flow and reducing flood risks in the region.
With a spillway type of "Uncontrolled" and no outlet gates, there are key maintenance and inspection activities that need to be conducted regularly to ensure the dam's structural integrity and functionality. As climate change continues to impact water resources, it is essential to have proper risk management measures in place for structures like the Mill Picayune Watershed Site M-24-16 to adapt to changing environmental conditions and maintain their effectiveness in protecting communities and ecosystems downstream.
Year Completed |
1972 |
Dam Length |
520 |
Dam Height |
45 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.8 |
Drainage Area |
0.36 |
Nid Storage |
190 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
45 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
Little Sioux River Near Turin
|
1040cfs |
Maple River At Mapleton
|
323cfs |
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-24-16