Mill Picayune Watershed Site M-1 Reservoir Report
Last Updated: December 13, 2025
Mill Picayune Watershed Site M-1, located in Woodbine, Iowa, is a locally owned Earth dam constructed in 1980 by the USDA NRCS for the primary purposes of fire protection, stock, and small fish pond storage.
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Summary
The dam stands at a height of 36 feet and spans 500 feet in length, providing a storage capacity of 156 acre-feet and serving as a flood risk reduction measure for the Mill Creek watershed. With a drainage area of 0.38 square miles, the dam plays a crucial role in managing water resources in the Crawford County region.
Managed by the Iowa Department of Natural Resources, the Mill Picayune Watershed Site M-1 is subject to state regulation, permitting, inspection, and enforcement to ensure its structural integrity and safety. Despite being classified as having a significant hazard potential, the dam's condition remains unrated, highlighting the need for ongoing assessment and risk management measures. With a moderate risk assessment score of 3, stakeholders are urged to stay vigilant and prepared for any potential emergencies that may arise from the dam's operations.
As a key feature in the local water infrastructure, Mill Picayune Watershed Site M-1 serves as a vital resource for water supply, irrigation, and environmental conservation efforts in the area. With its strategic location along the Mill Creek and its role in flood risk reduction, the dam showcases the importance of sustainable water management practices in mitigating climate change impacts and ensuring the resilience of communities against water-related hazards.
Year Completed |
1980 |
Dam Length |
500 |
Dam Height |
36 |
River Or Stream |
MILL CREEK |
Primary Dam Type |
Earth |
Surface Area |
8 |
Drainage Area |
0.38 |
Nid Storage |
156 |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
36 |
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-1