Mill Picayune Watershed Site N-3 Reservoir Report
Last Updated: December 14, 2025
Located in Woodbine, Iowa, the Mill Picayune Watershed Site N-3 is a crucial earth dam structure completed in 1973 by the USDA NRCS.
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Summary
Designed for fire protection, stock, and small fish pond purposes, this site serves as a vital resource for flood risk reduction in the area. With a dam height of 42 feet and a storage capacity of 388 acre-feet, the site covers a surface area of 9.7 acres and drains a 6.04 square-mile watershed.
Managed by the Iowa Department of Natural Resources, this site is state-regulated with permitting, inspection, and enforcement protocols in place. The dam's spillway type is uncontrolled, with a length of 1125 feet and a maximum discharge rate of 0 cubic feet per second. Despite its low hazard potential, the site's risk assessment is moderate, indicating the need for ongoing monitoring and management measures to ensure its safety and functionality.
Nestled along the TR-Picayune Creek, this watershed site plays a crucial role in water resource management and climate resilience efforts in Harrison County, Iowa. With its strategic location and design, the Mill Picayune Watershed Site N-3 serves as a testament to the importance of sustainable infrastructure for mitigating flood risks and protecting local ecosystems in the face of changing climatic conditions.
Year Completed |
1973 |
Dam Length |
1125 |
Dam Height |
42 |
River Or Stream |
TR-PICAYUNE CREEK |
Primary Dam Type |
Earth |
Surface Area |
9.7 |
Drainage Area |
6.04 |
Nid Storage |
388 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
42 |
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 N-3