Letterman Lake Dam Reservoir Report
Last Updated: December 17, 2025
Letterman Lake Dam, located in Moscow Mills, Missouri, is a privately owned earth dam constructed in 1976 for irrigation purposes along the TR-White Oak Creek.
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Summary
The dam stands at a height of 19 feet and has a maximum storage capacity of 163 acre-feet, with a normal storage capacity of 95 acre-feet spread over a surface area of 7 acres. Despite its low hazard potential, the dam has a moderate risk assessment rating of 3 due to its uncontrolled spillway and lack of outlet gates.
With a structural height of 20 feet and a length of 1150 feet, Letterman Lake Dam plays a crucial role in managing water resources in Montgomery County. While primarily designed for irrigation, the dam also serves recreational purposes for the local community. The dam's stone core and soil foundations contribute to its stability, although its condition has not been officially rated. The risk management measures and emergency action plan for the dam are currently not documented, highlighting the need for further assessment and preparedness in case of emergencies.
In the heart of Kansas City District, Letterman Lake Dam stands as a testament to sustainable water resource management. Its location and design showcase the importance of balancing agricultural needs with environmental considerations. As water resource and climate enthusiasts, it is vital to monitor and support the ongoing maintenance and safety measures of this critical infrastructure to ensure the resilience of the surrounding ecosystem and community.
Year Completed |
1976 |
Dam Length |
1150 |
Dam Height |
19 |
River Or Stream |
TR-WHITE OAK CREEK |
Primary Dam Type |
Earth |
Surface Area |
7 |
Hydraulic Height |
18 |
Drainage Area |
244 |
Nid Storage |
163 |
Structural Height |
20 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Fork Salt River Above Santa Fe
|
12cfs |
Long Branch Near Santa Fe
|
8cfs |
Lick Creek At Perry
|
2cfs |
Missouri River At Hermann
|
28400cfs |
Cuivre River Near Troy
|
42cfs |
Spencer Cr. Bl Plum Cr. Nr Frankford
|
24cfs |
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.
Letterman Lake Dam