Mill Picayune Watershed Site N-1 Reservoir Report
Last Updated: December 14, 2025
Located in Woodbine, Iowa, the Mill Picayune Watershed Site N-1 is a dam with a primary purpose of fire protection, stock, or small fish pond management.
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Summary
Completed in 1972, this earth dam stands at a height of 37 feet and spans a length of 611 feet, providing a storage capacity of 156 acre-feet. The dam is regulated by the Iowa Department of Natural Resources and has a low hazard potential.
Situated on TR-Picayune Creek in Shelby County, this watershed site covers a drainage area of 0.42 square miles and has a surface area of 6.5 acres. While the dam has not been rated for its condition, it is subject to regular state inspection, permitting, and enforcement. The risk assessment for this site is moderate, indicating the need for ongoing monitoring and management to ensure its continued safety and functionality.
Managed by the local government and designed by the USDA NRCS, the Mill Picayune Watershed Site N-1 serves as a critical infrastructure for flood risk reduction in the area. With its strategic location and purposeful design, this site plays a key role in water resource management and climate resilience efforts in the region, highlighting the importance of sustainable infrastructure development in safeguarding communities against natural hazards.
Year Completed |
1972 |
Dam Length |
611 |
Dam Height |
37 |
River Or Stream |
TR-PICAYUNE CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.5 |
Drainage Area |
0.42 |
Nid Storage |
156 |
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 N-1