Mill Picayune Watershed Site M-16-2 Reservoir Report

Last Updated: December 13, 2025

The Mill Picayune Watershed Site M-16-2 in Iowa is a crucial earth dam constructed in 1972 for fire protection, stock, and small fish pond purposes.


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Summary

Managed by the local government and designed by the USDA NRCS, this dam plays a vital role in flood risk reduction for the area. With a storage capacity of 134 acre-feet and covering a drainage area of 0.45 square miles, this structure stands at a height of 36 feet and spans a length of 540 feet, providing essential water resource management for the region.

Situated on TR-Mill Creek in Crawford County, Iowa, this low hazard potential dam is regulated and permitted by the Iowa DNR. Despite being uncontrolled, the spillway type is designed to manage any excess water effectively. The risk assessment for this dam is moderate, indicating the need for ongoing monitoring and management measures. Overall, the Mill Picayune Watershed Site M-16-2 serves as a critical element in the water resource infrastructure of the area, highlighting the importance of sustainable water management practices in the face of changing climate conditions.

Year Completed

1972

Dam Length

540

Dam Height

36

River Or Stream

TR-MILL CREEK

Primary Dam Type

Earth

Surface Area

7.4

Drainage Area

0.45

Nid Storage

134

Hazard Potential

Low

Foundations

Soil

Nid Height

36
       
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.