Desoto Dam Reservoir Report

Last Updated: December 12, 2025

Desoto Dam, located in Pottawattamie, Iowa, serves as a crucial structure along the Missouri River, managed by the U.S.


°F

°F

mph

Wind

%

Humidity

Summary

Army Corps of Engineers. Completed in 1960, this earth dam stands at 25 feet high and spans 2950 feet in length, providing a vital source of water storage for the area. Its primary purpose is to create a Fish and Wildlife Pond, supporting both aquatic habitats and recreational activities for enthusiasts in the region.

The dam's design, with a stone core and a soil foundation, ensures its resilience in managing water flow and storage effectively. With a normal storage capacity of 7261 acre-feet and a drainage area of 31 square miles, Desoto Dam plays a significant role in regulating water levels and supporting the diverse ecosystems along the Missouri River. Despite its low hazard potential, regular inspections and maintenance ensure the dam's structural integrity remains satisfactory, with the last assessment conducted in August 2020.

Desoto Dam not only safeguards the local environment but also provides a scenic and recreational spot for visitors to enjoy. With a rich history of modifications to enhance its structural and hydraulic capabilities, this dam stands as a testament to the harmonious coexistence of water resource management and environmental conservation. As a focal point for the Fish and Wildlife Service, Desoto Dam serves as a vital link in maintaining the delicate balance between human needs and ecological preservation along the Missouri River.

Years Modified

1969 - Structural, 1985 - Hydraulic

Year Completed

1960

Dam Length

2950

Dam Height

25

River Or Stream

Missouri River

Primary Dam Type

Earth

Surface Area

1900

Hydraulic Height

15

Drainage Area

31

Nid Storage

45400

Structural Height

25

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Foundations

Soil

Nid Height

25
       
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.