Mill Picayune Watershed Site P-47-3 Reservoir Report
Last Updated: December 15, 2025
Mill Picayune Watershed Site P-47-3, located in Shelby County, Iowa, is a crucial water resource managed by the local government for fire protection, stock, and small fish pond purposes.
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Summary
Completed in 1978 by the USDA NRCS, this earth dam stands at a height of 38 feet and spans 650 feet, with a storage capacity of 118 acre-feet and a drainage area of 0.32 square miles. Despite its low hazard potential, the dam's condition assessment is currently not rated, highlighting the need for regular inspections and maintenance to ensure its continued effectiveness.
Managed by the Iowa DNR, the Mill Picayune Watershed site plays a vital role in flood risk reduction along the TR-Picayune river. With a moderate risk assessment level of 3, it is important for stakeholders to implement risk management measures and update emergency action plans to meet guidelines for potential inundation events. The dam's uncontrolled spillway and soil foundation present unique challenges that require careful monitoring and proactive decision-making to safeguard the surrounding community from water-related hazards.
As a part of the Rock Island District in Iowa, Mill Picayune Watershed Site P-47-3 is a valuable asset for water resource and climate enthusiasts to study and analyze. Its location in Woodbine, Iowa, and the involvement of various state and federal agencies in its design and regulation make it a fascinating case study for understanding the intersection of water management, environmental protection, and infrastructure development. By staying informed about the site's history, construction, and current condition, enthusiasts can contribute to ongoing efforts to ensure the resilience and sustainability of this important water resource in Iowa.
Year Completed |
1978 |
Dam Length |
650 |
Dam Height |
38 |
River Or Stream |
TR-PICAYUNE |
Primary Dam Type |
Earth |
Surface Area |
7 |
Drainage Area |
0.32 |
Nid Storage |
118 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
38 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
Little Sioux River Near Turin
|
1040cfs |
West Nishnabotna River At Hancock
|
154cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Maple River At Mapleton
|
323cfs |
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 P-47-3