Henke Lake Dam Reservoir Report

Last Updated: December 9, 2025

Henke Lake Dam, located in Mokane, Missouri, is a privately owned earth dam primarily used for irrigation purposes.


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Summary

Completed in 1970, this dam stands at a height of 33 feet and spans a length of 320 feet, with a storage capacity of 412 acre-feet. The dam is situated on the Prairie Fork river and serves as a vital water resource for the surrounding area.

With a high hazard potential, Henke Lake Dam has not been rated for its condition assessment since its last inspection in 1990. Despite its age, the dam continues to provide essential water storage for irrigation, fire protection, and recreational purposes. The dam's ability to withstand potential risks and manage water discharge remains a crucial aspect for water resource and climate enthusiasts to monitor.

As part of the St. Louis District, Henke Lake Dam falls under the jurisdiction of the state of Missouri and is not regulated by a state agency. The dam's association with the Prairie Fork river underscores its importance in managing water resources and highlights the need for proper maintenance and inspection to ensure its continued functionality and safety for the community it serves.

Year Completed

1970

Dam Length

320

Dam Height

33

River Or Stream

PRAIRIE FORK

Primary Dam Type

Earth

Surface Area

25

Drainage Area

4200

Nid Storage

412

Structural Height

33

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.