Horner Lake Dam Reservoir Report

Last Updated: December 12, 2025

Horner Lake Dam in Missouri stands as a vital structure serving multiple purposes, including fire protection, stock, small fish pond, grade stabilization, and recreation.


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Summary

Completed in 1980, this earth-type dam boasts a height of 26 feet and a length of 575 feet, with a capacity to store up to 83 acre-feet of water. Nestled along the TR-Gans Creek, the dam not only provides essential water resources but also supports fish and wildlife conservation efforts in the region.

Despite its low hazard potential, the dam's risk assessment indicates a moderate level of risk, highlighting the need for ongoing monitoring and maintenance. With a designated spillway and uncontrolled spillway type, Horner Lake Dam is equipped to manage up to 42 cubic feet per second of maximum discharge. While the dam's condition remains unrated, its strategic location in Boone County, Missouri, underscores its significance in safeguarding the surrounding environment and supporting the local ecosystem.

As a private-owned structure overseen by the St. Louis District, Horner Lake Dam serves as a testament to the intersection of water resource management and climate resilience. With its primary purpose being a fish and wildlife pond, the dam embodies the balance between human needs and environmental conservation, making it a vital asset in the state's infrastructure landscape.

Year Completed

1980

Dam Length

575

Dam Height

26

River Or Stream

TR-GANS CREEK

Primary Dam Type

Earth

Surface Area

10

Hydraulic Height

26

Drainage Area

192

Nid Storage

83

Structural Height

26

Outlet Gates

None

Hazard Potential

Low

Foundations

Soil

Nid Height

26
       
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.