Mann Lake Dam Reservoir Report
Nearby: Browning Lake Dam Browning Lake
Last Updated: December 13, 2025
Mann Lake Dam, located in Bethel, Missouri, serves as a crucial structure for debris control, irrigation, and recreation purposes.
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Summary
This private dam, completed in 1977, stands at a height of 22 feet and has a storage capacity of 106 acre-feet. With a primary purpose of debris control, the dam plays a vital role in managing water resources in the area while also providing opportunities for irrigation and recreational activities.
Situated on the TR to Garnett Branch river/stream, Mann Lake Dam is owned and operated by a private entity, with no state regulation or oversight. Despite its low hazard potential and a lack of formal condition assessment, the dam continues to fulfill its intended functions effectively. The dam's earth construction with a buttress core type reflects its stable structural design, contributing to its reliability and longevity in serving the local community's water resource management needs.
For water resource and climate enthusiasts, Mann Lake Dam presents an intriguing case study of a privately-owned structure that plays a significant role in managing water resources in Shelby County, Missouri. As a key component of the local landscape, the dam not only serves practical purposes like debris control and irrigation but also offers recreational opportunities for visitors. Its historical significance, sturdy construction, and ongoing functionality make Mann Lake Dam a noteworthy feature for those interested in the intersection of water management, infrastructure, and environmental stewardship.
Year Completed |
1977 |
Dam Height |
22 |
River Or Stream |
TR TO GARNETT BRANCH |
Primary Dam Type |
Earth |
Surface Area |
9 |
Drainage Area |
62 |
Nid Storage |
106 |
Structural Height |
22 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
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.
Mann Lake Dam