Spring Fork Lake Dam Reservoir Report

Last Updated: December 5, 2025

Spring Fork Lake Dam, located in Pettis, Missouri, is a vital water supply structure managed by the local government and regulated by the Dam and Reservoir Safety Program.


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Summary

Built in 1925 by BURNS AND MCDONNELL, this stone dam stands at a height of 43 feet and spans 1600 feet, with a storage capacity of 3104 acre-feet and a surface area of 128 acres. The dam's primary purpose is water supply, serving the surrounding area with a normal storage capacity of 1613 acre-feet.

Despite its satisfactory condition assessment in 2007, Spring Fork Lake Dam poses a high hazard potential and undergoes inspections every two years to ensure its safety. The spillway type is uncontrolled, with a width of 185 feet, and the outlet gates are valve-operated. The risk assessment for the dam is moderate, indicating a potential for three on a scale of one to five. While the dam has not been modified in recent years, its emergency action plan was last revised in 2010, highlighting the importance of proper risk management and preparedness in the face of potential hazards.

Year Completed

1925

Dam Length

1600

Dam Height

43

River Or Stream

CHEESE CK

Primary Dam Type

Other

Surface Area

128

Drainage Area

6906

Nid Storage

3104

Structural Height

43

Outlet Gates

Valve

Hazard Potential

High

Foundations

Rock

Nid Height

43
       
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.