Lake Lenexa Reservoir Report

Last Updated: December 6, 2025

Lake Lenexa, located in Johnson County, Kansas, is a man-made reservoir with a primary purpose of recreation.


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Summary

Built in 2006 by BLACK & VEATCH, this 33-acre lake offers a tranquil escape for water resource and climate enthusiasts. With a maximum storage capacity of 1020 acre-feet and a normal storage level of 570 acre-feet, Lake Lenexa provides a valuable water resource for the surrounding area.

The dam at Lake Lenexa stands at a height of 46 feet and spans 740 feet in length, serving as a vital structure for water control and management. Despite its high hazard potential, the dam has been deemed to be in satisfactory condition, with regular inspections conducted to ensure its safety. The lake also features an uncontrolled spillway and a drainage area of 2.19 square miles, allowing for the efficient release of excess water during times of high discharge.

With its picturesque surroundings and ample recreational opportunities, Lake Lenexa is a popular destination for locals and visitors alike. Whether it's fishing, boating, or simply enjoying the natural beauty of the area, this reservoir offers a peaceful retreat for those seeking a connection to water resources and the environment. As a regulated water body under the jurisdiction of the Kansas Department of Agriculture, Lake Lenexa plays a crucial role in both water management and conservation efforts in the region.

Year Completed

2006

Dam Length

740

Dam Height

46

River Or Stream

COON CREEK-TR

Primary Dam Type

Earth

Surface Area

33

Drainage Area

2.19

Nid Storage

1020

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

46
       
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.