Tanner Lake Dam Reservoir Report
Last Updated: December 16, 2025
Located in Ray, Missouri, Tanner Lake Dam is a private-owned structure built in 1975 with a primary purpose of grade stabilization.
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Summary
The dam, constructed of earth and stone, stands at a height of 29 feet and has a maximum storage capacity of 108 acre-feet. With a significant hazard potential and a moderate risk assessment rating, the dam poses a potential risk to the surrounding area in case of failure.
Situated on TR-Cravens Creek, Tanner Lake Dam serves multiple purposes including fire protection, stock watering, and small fish pond creation. Despite being privately owned, the dam is not regulated or inspected by any state agency. With an uncontrolled spillway and no outlet gates, the dam has not been assessed for its current condition, and an emergency action plan has not been prepared or updated.
Water resource and climate enthusiasts will find Tanner Lake Dam an intriguing structure due to its unique design and multiple purposes. The dam's location in a rural area highlights the importance of proper maintenance and monitoring to ensure the safety of downstream communities and the surrounding environment in the event of a potential failure.
Year Completed |
1975 |
Dam Length |
700 |
Dam Height |
29 |
River Or Stream |
TR-CRAVENS CREEK |
Primary Dam Type |
Earth |
Surface Area |
18 |
Hydraulic Height |
28 |
Drainage Area |
278 |
Nid Storage |
108 |
Structural Height |
30 |
Outlet Gates |
None |
Hazard Potential |
Significant |
Foundations |
Soil |
Nid Height |
30 |
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.
Tanner Lake Dam