Lake Konstanz Dam Reservoir Report

Last Updated: December 18, 2025

Lake Konstanz Dam, also known as Mcginnes Lake Dam, is a private-owned structure located in Warren, Missouri.


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Summary

Completed in 1999, this Earth-type dam stands at a height of 90 feet and has a length of 525 feet. It holds a maximum storage capacity of 103 acre-feet, with a normal storage level of 86 acre-feet and a surface area of 19 acres.

The dam, situated on a tributary of Charrette Creek, is regulated by the Dam and Reservoir Safety Program in Missouri. Despite its high hazard potential, the condition assessment in 2021 deemed it unsatisfactory, raising concerns about its ability to withstand potential emergencies. The dam's spillway is uncontrolled with a width of 4 feet, and it has no outlet gates or associated locks.

With a moderate risk assessment and a history of inspections, this dam serves as a critical structure for water resource management in the area. However, the unsatisfactory condition and high hazard potential highlight the need for ongoing maintenance and monitoring to ensure the safety and reliability of Lake Konstanz Dam for both water resource management and climate resilience.

Year Completed

1999

Dam Length

525

Dam Height

90

River Or Stream

TRIB. CHARRETTE CREEK

Primary Dam Type

Earth

Surface Area

19

Drainage Area

89

Nid Storage

103

Structural Height

90

Outlet Gates

None

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

90
       
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.