Mill Picayune Watershed Site M-6-1 Reservoir Report
Last Updated: December 13, 2025
Located in Harrison County, Iowa, the Mill Picayune Watershed Site M-6-1 is a vital water resource managed by the local government.
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Summary
Designed by the USDA NRCS, this earth dam was completed in 1992 and serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. With a dam height of 37 feet and a storage capacity of 66 acre-feet, this structure plays a crucial role in ensuring water availability and managing flood risk in the area.
Managed by the Iowa DNR, this watershed site is regulated, inspected, and enforced to meet state requirements for safety and environmental compliance. Despite its low hazard potential, the site has a moderate risk assessment rating of 3 due to its location and potential impact on surrounding areas in case of emergencies. The dam's uncontrolled spillway and soil foundation make it a crucial component of the local water management infrastructure, contributing to the overall water security and environmental sustainability of the region.
With a surface area of 3.8 acres and a drainage area of 0.18 square miles, the Mill Picayune Watershed Site M-6-1 plays a significant role in managing water flow and storage in the area. As a key element in the local water management system, this site highlights the importance of sustainable water resource management and climate resilience efforts in safeguarding the community's water supply and mitigating flood risks.
Year Completed |
1992 |
Dam Length |
419 |
Dam Height |
37 |
River Or Stream |
TR-MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
3.8 |
Drainage Area |
0.18 |
Nid Storage |
66 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
37 |
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-6-1