Nine Eagles Park Lake Dam Reservoir Report

Last Updated: April 23, 2026

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Nine Eagles Park Lake Dam, located in Decatur County, Iowa, is a state-regulated earth dam completed in 1930 for the primary purpose of recreation.


Summary

Standing at a height of 53 feet and stretching 1000 feet in length, this dam holds a maximum storage capacity of 1560 acre-feet and covers a surface area of 59 acres. Situated on the TR-Thompson River, the dam is under the jurisdiction of the Iowa Department of Natural Resources, ensuring regular inspections and enforcement of safety measures.

With a significant hazard potential and a fair condition assessment as of May 2017, Nine Eagles Park Lake Dam serves as a vital recreational resource in the region. The dam's uncontrolled spillway, with a width of 55 feet, helps manage water flow during high water events. Despite moderate risk assessment, the dam continues to provide opportunities for outdoor activities and water-based recreation in the area. As a beloved feature of the landscape, the dam's role in water resource management and climate resilience underscores its importance for both local communities and environmental enthusiasts alike.

15-Day Long Term Forecast


Year Completed

1930

Dam Length

1000

Dam Height

53

River Or Stream

TR-THOMPSON RIVER

Primary Dam Type

Earth

Surface Area

59

Drainage Area

1.77

Nid Storage

1560

Hazard Potential

Significant

Foundations

Soil

Nid Height

53
       
Seasonal Comparison

5-Day Hourly Forecast Detail

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.
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