Mill Picayune Watershed Site N-13-1 Reservoir Report
Last Updated: December 15, 2025
The Mill Picayune Watershed Site N-13-1 in Harrison County, Iowa, is a key water resource managed by the local government in collaboration with the USDA NRCS.
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Summary
This site, completed in 1965, serves multiple purposes including fire protection, stock watering, and small fish pond maintenance. With a dam height of 31 feet and a storage capacity of 149 acre-feet, the site covers a surface area of 6.5 acres and drains an area of 0.85 square miles. The dam, primarily constructed with earth materials on a soil foundation, is regulated by the Iowa DNR and undergoes state permitting, inspection, and enforcement.
Located in Woodbine, Iowa, along the TR-Picayune Creek, the Mill Picayune Watershed Site N-13-1 plays a vital role in flood risk reduction for the surrounding area. Despite its low hazard potential, the site is categorized as having moderate risk (3) and is not currently rated for its condition assessment. While the dam features an uncontrolled spillway, it does not have outlet gates or locks. The site's emergency action plan status, inspection frequency, and risk management measures remain unspecified, highlighting areas where further attention and development may be necessary to ensure the site's continued effectiveness in water resource management and climate resilience efforts.
Year Completed |
1965 |
Dam Length |
885 |
Dam Height |
31 |
River Or Stream |
TR-PICAYUNE CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.5 |
Drainage Area |
0.85 |
Nid Storage |
149 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
31 |
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-13-1