Mill Picayune Watershed Site A-2 Reservoir Report
Last Updated: December 13, 2025
Mill Picayune Watershed Site A-2, located in Harrison County, Iowa, is a vital resource managed by the local government for fire protection, livestock, and small fish pond purposes.
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Summary
Constructed in 1966 by the USDA NRCS, this Earth-type dam stands at a height of 31 feet and spans a length of 639 feet, with a storage capacity of 60 acre-feet. Situated along the TR-BOYER RIVER, this site plays a crucial role in flood risk reduction for the surrounding area.
Despite its low hazard potential, the condition of Mill Picayune Watershed Site A-2 is currently not rated, reflecting the need for further assessment and maintenance. With a moderate risk assessment rating, this site presents opportunities for improved risk management measures to enhance its overall effectiveness and safety. As a key component of water resource management in the region, ongoing inspections, emergency preparedness, and risk mitigation strategies are essential to ensure the resilience and sustainability of this important infrastructure.
In collaboration with the Iowa DNR and other state agencies, efforts to monitor, maintain, and enhance the functionality of Mill Picayune Watershed Site A-2 are crucial for safeguarding the local community and environment. With a focus on sustainable water resource management and climate resilience, this site serves as a reminder of the interconnectedness between human activities, infrastructure development, and natural systems in shaping the future of our water resources. By prioritizing proactive measures and continuous improvements, we can ensure the long-term viability and effectiveness of this essential watershed site for generations to come.
Year Completed |
1966 |
Dam Length |
639 |
Dam Height |
31 |
River Or Stream |
TR-BOYER RIVER |
Primary Dam Type |
Earth |
Surface Area |
5.7 |
Drainage Area |
0.4 |
Nid Storage |
60 |
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 A-2