Mill Picayune Watershed Site M-24-3 Reservoir Report

Last Updated: December 15, 2025

Located in Shelby County, Iowa, the Mill Picayune Watershed Site M-24-3 is a vital water resource managed by the local government.


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Summary

This site, designed by the USDA NRCS, serves multiple purposes including fire protection, stock, small fish pond, and flood risk reduction. The earth dam, completed in 1963, stands at a height of 41 feet and has a storage capacity of 96 acre-feet.

With a surface area of 4.3 acres and a drainage area of 0.24 square miles, this site plays a crucial role in managing water resources in the region. While the hazard potential is rated as low and the risk assessment as moderate, the condition of the dam is currently not rated. The site is regulated by the Iowa DNR and undergoes regular inspections, permitting, and enforcement to ensure its structural integrity and safety.

As part of the Rock Island District, the Mill Picayune Watershed Site M-24-3 is an essential component of the local water management infrastructure. Climate and water resource enthusiasts will appreciate the site's multi-purpose functionality and its role in mitigating flood risks while providing essential water resources for fire protection and wildlife habitat. With a history dating back to the 1960s, this site exemplifies the importance of sustainable water resource management in the face of changing climate conditions.

Year Completed

1963

Dam Length

495

Dam Height

41

River Or Stream

TR-MILL CREEK

Primary Dam Type

Earth

Surface Area

4.3

Drainage Area

0.24

Nid Storage

96

Hazard Potential

Low

Foundations

Soil

Nid Height

41
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.