Lake 40 & 8 Dam Reservoir Report

Last Updated: December 5, 2025

Lake 40 & 8 Dam, located in Sedgwick County, Kansas, is a private earth dam primarily used for recreation purposes.


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Summary

Standing at a height of 20 feet and stretching for 625 feet in length, this dam boasts a NID storage capacity of 110 acre-feet, with a normal storage level of 80 acre-feet. The structure is situated on Spring Creek-TR, offering a serene and picturesque setting for water resource and climate enthusiasts to explore.

Despite its low hazard potential and not having been state-regulated or inspected since 1997, Lake 40 & 8 Dam remains a popular spot for outdoor activities in the region. With its buttress core type and unknown foundation, the dam provides a safe recreational space for visitors to enjoy fishing, boating, and other water-based activities. While the dam's risk assessment and emergency preparedness measures are currently not rated or specified, the tranquil surroundings and ample storage capacity make it an ideal destination for those seeking a peaceful escape.

In the absence of federal funding, design, construction, regulation, or operations, Lake 40 & 8 Dam stands as a testament to private ownership and stewardship in maintaining water resources for recreational use. Whether you're a local resident or a traveler passing through Oxford, Kansas, this dam offers a unique opportunity to appreciate the beauty of nature while supporting sustainable water management practices.

Dam Length

625

Dam Height

16

River Or Stream

SPRING CREEK-TR

Primary Dam Type

Earth

Hydraulic Height

16

Drainage Area

7.03

Nid Storage

110

Structural Height

20

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

20
       
Seasonal Comparison

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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.