Rainbow Lake Dam Reservoir Report
Nearby: Lake Kal-Tatri Butterfly Lake Dam
Last Updated: January 11, 2026
Rainbow Lake Dam, located in Coffman, Missouri, is a private earth dam that was completed in 1964 for the primary purpose of recreation.
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Summary
With a height of 31 feet and a storage capacity of 580 acre-feet, the dam sits on the River Aux Vases and covers a surface area of 35 acres. Despite its recreational use, the dam has a high hazard potential, making it crucial to ensure proper maintenance and monitoring.
Although the dam has not been inspected since 1978 and is currently rated as "Not Rated" in terms of condition assessment, its high hazard potential underscores the importance of regular inspection and maintenance. The dam's location in Ste. Genevieve County, Missouri, highlights its significance in managing water resources and mitigating potential risks to surrounding areas. With its proximity to the Kansas City District, the dam falls under the jurisdiction of the US Army Corps of Engineers and is subject to federal regulations and guidelines.
As a key infrastructure for recreation and water management in the region, Rainbow Lake Dam serves as a reminder of the importance of maintaining and monitoring dams to ensure the safety of communities and the environment. With its high hazard potential and limited inspection history, there is a pressing need for updated assessments and risk management measures to safeguard against potential hazards and ensure the dam's structural integrity for years to come.
Year Completed |
1964 |
Dam Height |
31 |
River Or Stream |
RIVER AUX VASES |
Primary Dam Type |
Earth |
Surface Area |
35 |
Drainage Area |
1741 |
Nid Storage |
580 |
Structural Height |
31 |
Hazard Potential |
High |
Foundations |
Unlisted/Unknown |
Nid Height |
31 |
Seasonal Comparison
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Nearby Streamflow Levels
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.
Rainbow Lake Dam