Idle Wild Lake Reservoir Report

Last Updated: December 12, 2025

Idle Wild Lake, also known as Waterville Dam, is a picturesque reservoir located in Waterville, Kansas.


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Summary

Managed by the local government, this dam on the Little Blue River-TR serves primarily for recreational purposes, offering a tranquil escape for water resource and climate enthusiasts. Constructed in 1935 by Wilson Engineering Co, Idle Wild Lake stands at a height of 45 feet with a hydraulic height of 38 feet, providing a maximum storage capacity of 145 acre-feet.

With a low hazard potential and a condition assessment of "Not Rated," Idle Wild Lake is a well-maintained structure with state-regulated oversight from the Kansas Department of Agriculture. The dam features a spillway width of 100 feet and is surrounded by beautiful natural surroundings, making it a popular spot for outdoor activities such as fishing, boating, and birdwatching. The dam's location within the Kansas City District adds to its appeal as a must-visit destination for those interested in water resources and climate conservation efforts in the region.

As a beloved recreational spot in Marshall County, Kansas, Idle Wild Lake offers a serene setting for visitors to enjoy the beauty of nature while also appreciating the engineering marvel that is the dam itself. Whether you're a water enthusiast looking to explore new reservoirs or a climate advocate interested in sustainable water management practices, Idle Wild Lake is a destination that showcases the harmonious relationship between human development and environmental preservation. With its rich history, scenic views, and state-regulated maintenance, Idle Wild Lake is a gem waiting to be discovered by those passionate about water resources and climate conservation.

Year Completed

1935

Dam Length

620

Dam Height

45

River Or Stream

LITTLE BLUE RIVER-TR

Hydraulic Height

38

Nid Storage

145

Structural Height

45

Outlet Gates

None

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

45
       
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.