Mill Picayune Watershed Site I-1 Reservoir Report
Last Updated: December 13, 2025
The Mill Picayune Watershed Site I-1, located in Woodbine, Iowa, was completed in 1984 by the USDA NRCS and serves multiple purposes including fire protection, stock, and small fish pond management, as well as flood risk reduction.
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Summary
This earth dam stands at 35 feet high with a length of 506 feet, providing a storage capacity of 110 acre-feet and covering a surface area of 6.5 acres. Situated on the TR-Boyer River, this site is regulated by the Iowa DNR and is inspected, permitted, and enforced by state authorities.
With a low hazard potential and a moderate risk assessment rating, the Mill Picayune Watershed Site I-1 is identified as a key asset for water resource management in the Harrison County area. While the condition assessment is currently not rated, the site meets state guidelines for emergency action planning and risk management measures. Its location in a rural setting further emphasizes the importance of maintaining this structure for both water resource sustainability and public safety in the region.
As part of the Rock Island District, this watershed site plays a crucial role in mitigating flood risks and providing essential water management services. Managed by local government authorities, the Mill Picayune Watershed Site I-1 stands as a testament to collaborative efforts in ensuring the resilience of water resources amidst changing climate conditions.
Year Completed |
1984 |
Dam Length |
506 |
Dam Height |
35 |
River Or Stream |
TR- BOYER R. |
Primary Dam Type |
Earth |
Surface Area |
6.5 |
Drainage Area |
0.47 |
Nid Storage |
110 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
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 I-1