Mill Picayune Watershed Site M-2-2 Reservoir Report
Last Updated: December 13, 2025
Located in Woodbine, Iowa, the Mill Picayune Watershed Site M-2-2 is a crucial water resource system designed by the USDA NRCS in 1967 for fire protection, stock, and small fish pond purposes.
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Summary
This earth dam structure stands at 45 feet tall and spans 368 feet in length, with a storage capacity of 217 acre-feet and a drainage area of 0.41 square miles. Situated along the TR-Boyer River, this site plays a vital role in flood risk reduction for Harrison County, Iowa.
Managed by the local government and regulated by the Iowa DNR, the Mill Picayune Watershed Site M-2-2 has a low hazard potential and a moderate risk assessment rating. Despite being uncontrolled, the spillway type, this dam site has not been inspected or rated for its condition. With a surface area of 8.3 acres and a normal storage capacity of 174 acre-feet, this site provides essential water management services for the surrounding area, while also serving as a recreational spot for fishing and wildlife conservation efforts.
With its strategic location and significant impact on water resources in the region, the Mill Picayune Watershed Site M-2-2 stands as a testament to sustainable water management practices. As climate change continues to pose challenges to water availability and quality, this site serves as a critical infrastructure for maintaining environmental resilience and supporting the community's water needs. As efforts are made to ensure the site's continued operation and safety, it remains a valuable asset for both water resource and climate enthusiasts alike.
Year Completed |
1967 |
Dam Length |
368 |
Dam Height |
45 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
8.3 |
Drainage Area |
0.41 |
Nid Storage |
217 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
45 |
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 M-2-2