Fox Lake Dam Reservoir Report

Last Updated: December 5, 2025

Fox Lake Dam, also known as El Dorado Dam, is a privately owned structure located in Cassoday, Kansas.


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Summary

Completed in 1928, this earth dam stands 33 feet tall and stretches 2410 feet in length along the Walnut River-TR. With a primary purpose of recreation, the dam provides a storage capacity of 3630 acre-feet and is regulated by the Kansas Department of Agriculture.

The dam's hazard potential is classified as high, but its condition assessment remains satisfactory as of the last inspection in August 2020. While the dam has no spillway type listed, it does have a spillway width of 206 feet. The surrounding area has a drainage area of 6.92 square miles, making Fox Lake Dam a critical water resource for the region.

For water resource and climate enthusiasts, Fox Lake Dam serves as a fascinating example of early 20th-century engineering and its ongoing impact on local water management. With its recreational focus and state regulation, the dam stands as a reminder of the delicate balance between human development and environmental stewardship in the face of changing climate conditions.

Year Completed

1928

Dam Length

2410

Dam Height

28

River Or Stream

WALNUT RIVER-TR

Primary Dam Type

Earth

Hydraulic Height

28

Drainage Area

6.92

Nid Storage

3630

Structural Height

33

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

33
       
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.