Cool Valley Lake Dam Reservoir Report
Nearby: Casper Lake Dam Kelly Lake Dam
Last Updated: December 14, 2025
Cool Valley Lake Dam, located in Jonesburg, Missouri, serves as a vital structure for flood risk reduction along the Price Branch river.
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Summary
Built in 1972, this private-owned earth dam stands at a height of 20 feet and has a storage capacity of 407 acre-feet, with a normal storage level of 203 acre-feet. The dam covers a surface area of 38 acres and has a drainage area of 519 square miles.
Despite its historical significance in flood control, Cool Valley Lake Dam is classified as having a high hazard potential. The dam has not been inspected since 1979, and its condition assessment remains unrated. While it lacks a designated Emergency Action Plan (EAP) and risk management measures, the dam continues to play a crucial role in safeguarding the surrounding community from potential flooding events.
With its close proximity to residential areas, Cool Valley Lake Dam stands as a testament to the delicate balance between water resource management and climate resilience. As enthusiasts of water resources and climate change, understanding the operational and safety aspects of structures like Cool Valley Lake Dam is essential in ensuring the long-term sustainability of our environment and communities.
Year Completed |
1972 |
Dam Height |
20 |
River Or Stream |
PRICE BRANCH |
Primary Dam Type |
Earth |
Surface Area |
38 |
Drainage Area |
519 |
Nid Storage |
407 |
Structural Height |
20 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Missouri River At Hermann
|
27500cfs |
Cuivre River Near Troy
|
83cfs |
Bourbeuse River At Union
|
75cfs |
Dardenne Creek At Ofallon
|
4cfs |
Dardenne Creek At Old Town St. Peters
|
8cfs |
Bonhomme Creek Near Ellisville
|
0cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Cool Valley Lake Dam