Mill Picayune Watershed Site P-39-2 Reservoir Report
Last Updated: December 14, 2025
Located in Shelby, Iowa, the Mill Picayune Watershed Site P-39-2 is a crucial water resource managed by the local government.
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Summary
This earth dam, completed in 1986 by the USDA NRCS, serves multiple purposes including fire protection, stock, and small fish pond maintenance, as well as flood risk reduction. With a height of 40 feet and a storage capacity of 99 acre-feet, this structure covers a surface area of 2.5 acres and drains an area of 0.33 square miles.
The dam, situated on the TR- PICAYUNE CR. stream, is regulated by the Iowa DNR and undergoes regular state inspections and enforcement measures. Despite being classified as having low hazard potential, the risk assessment for this site is moderate, indicating the need for continued monitoring and risk management. Although not currently rated for condition assessment, the Mill Picayune Watershed Site P-39-2 remains a crucial component of water resource management in the area.
With its strategic location and multiple functionalities, this site plays a vital role in maintaining water quality, managing flood risks, and supporting local ecosystems. As climate change impacts continue to affect water resources, the effective management and upkeep of structures like the Mill Picayune Watershed Site P-39-2 are essential for ensuring the resilience and sustainability of the surrounding communities and environment.
Year Completed |
1986 |
Dam Length |
569 |
Dam Height |
40 |
River Or Stream |
TR- PICAYUNE CR. |
Primary Dam Type |
Earth |
Surface Area |
2.5 |
Drainage Area |
0.33 |
Nid Storage |
99 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
40 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Boyer River At Logan
|
417cfs |
Soldier River At Pisgah
|
112cfs |
West Nishnabotna River At Hancock
|
154cfs |
Little Sioux River Near Turin
|
1040cfs |
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-39-2