Mill Picayune Watershed Site P-39-1 Reservoir Report
Last Updated: December 14, 2025
Located in Harrison County, Iowa, the Mill Picayune Watershed Site P-39-1 is a crucial water resource managed by the local government for multiple purposes including fire protection, stock watering, and flood risk reduction.
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Summary
Constructed in 1989 by the USDA NRCS, this earth dam stands at a height of 51 feet and has a storage capacity of 322 acre-feet, serving a drainage area of 0.64 square miles along the TR- Picayune Creek.
With a surface area of 13.8 acres, this watershed site plays a significant role in managing water flow and storage in the region while also contributing to environmental conservation efforts. The dam's uncontrolled spillway and low hazard potential make it a reliable structure for water management, with a moderate risk assessment rating. While the condition assessment is currently not rated, the Iowa Department of Natural Resources oversees state regulation, inspection, and enforcement to ensure the site's continued functionality and safety.
Water resource and climate enthusiasts will appreciate the strategic location of the Mill Picayune Watershed Site P-39-1, its multiple uses, and the collaborative efforts involved in its design and management. As a vital component in the local water infrastructure, this dam serves as a model for sustainable water resource management and environmental stewardship in the Woodbine area. Its impact on flood control, agricultural activities, and ecosystem health underscores the importance of responsible water resource development in mitigating climate-related challenges and ensuring community resilience.
Year Completed |
1989 |
Dam Length |
690 |
Dam Height |
51 |
River Or Stream |
TR- PICAYUNE CREEK |
Primary Dam Type |
Earth |
Surface Area |
13.8 |
Drainage Area |
0.64 |
Nid Storage |
322 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
51 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
West Nishnabotna River At Hancock
|
154cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
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 P-39-1