Mill Picayune Watershed Site S-10-2 Reservoir Report
Last Updated: December 14, 2025
Located in Harrison County, Iowa, the Mill Picayune Watershed Site S-10-2 is a key water resource managed by the local government for multiple purposes including fire protection, stock, small fish pond maintenance, and flood risk reduction.
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Summary
The dam, completed in 1965, stands at a height of 49 feet and has a storage capacity of 206 acre-feet. With a surface area of 9.2 acres and a drainage area of 0.98 square miles, the site plays a crucial role in managing water flow and storage in the area.
Managed by the USDA NRCS and regulated by the Iowa DNR, this earth dam on the TR-Picayune Creek serves as a low hazard potential structure with a moderate risk assessment rating. Despite not being currently rated for condition assessment, the site's strategic location in Woodbine, Iowa, aids in mitigating flood risks and ensuring water resource sustainability in the region. With state permitting, inspection, and enforcement in place, the Mill Picayune Watershed Site S-10-2 stands as a testament to effective water resource management and climate resilience practices in the area.
With a primary purpose of ensuring water availability for fire protection and livestock, this watershed site also highlights the importance of sustainable water management practices in mitigating climate risks. As a part of the broader water infrastructure in Harrison County, the site's strategic location and design play a crucial role in enhancing community resilience to extreme weather events and ensuring the long-term sustainability of water resources in the area.
Year Completed |
1965 |
Dam Length |
865 |
Dam Height |
49 |
River Or Stream |
TR-PICAYUNE CREEK |
Primary Dam Type |
Earth |
Surface Area |
9.2 |
Drainage Area |
0.98 |
Nid Storage |
206 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
49 |
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 |
West Nishnabotna River At Hancock
|
154cfs |
Maple River At Mapleton
|
323cfs |
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 S-10-2