Mill Picayune Watershed Site P-1 Reservoir Report
Last Updated: December 14, 2025
Mill Picayune Watershed Site P-1 is a crucial water resource in Shelby, Iowa, serving multiple purposes such as fire protection, livestock watering, and small fish pond habitat.
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Summary
Owned by the local government and designed by USDA NRCS, this earth dam was completed in 1984 and stands at a height of 41 feet, with a storage capacity of 290 acre-feet. The dam, situated on the TR-Picayune Creek, helps in flood risk reduction and has a low hazard potential.
The dam's primary purpose is to provide essential water resources for the Woodbine community while also contributing to environmental conservation efforts. With a drainage area of 0.57 square miles and a surface area of 12 acres, this structure plays a vital role in maintaining water quality and supporting local wildlife. Despite being uncontrolled, the spillway type of this dam ensures proper water management during heavy rainfall events, reducing the risk of potential flooding in the surrounding areas.
Overall, Mill Picayune Watershed Site P-1 represents a significant investment in water infrastructure, supporting both human and ecological needs in the region. By collaborating with state and federal agencies for regulation, inspection, and enforcement, this dam exemplifies responsible water resource management practices. As climate change continues to impact water availability and quality, structures like P-1 will play a crucial role in ensuring sustainable water usage for future generations.
Year Completed |
1984 |
Dam Length |
628 |
Dam Height |
41 |
River Or Stream |
TR- PICAYUNE CR. |
Primary Dam Type |
Earth |
Surface Area |
12 |
Drainage Area |
0.57 |
Nid Storage |
290 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
41 |
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 |
West Nishnabotna River At Hancock
|
154cfs |
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-1