Lac Tiffany Dam Reservoir Report
Nearby: Lac Capri Dam Lac Marseilles Dam
Last Updated: December 17, 2025
Lac Tiffany Dam, located in St.
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Summary
Francois County, Missouri, is a privately owned structure primarily used for recreation on the TR Big River. With a height of 33.9 feet and a length of 550 feet, this earth dam was completed in 1978 and has a storage capacity of 70 acre-feet. The dam is classified as having a low hazard potential and a moderate risk assessment rating.
Despite being uncontrolled, the spillway width of Lac Tiffany Dam is listed as 0, indicating potential limitations in its ability to handle excess water flow. The dam has not been inspected since October 2007, with an inspection frequency of every 5 years. While the condition assessment is not rated and there is no Emergency Action Plan (EAP) in place, the risk management measures are currently unspecified.
Water resource and climate enthusiasts may find Lac Tiffany Dam to be an intriguing structure due to its unique design and recreational purpose. The dam's location in Missouri, alongside its moderate risk assessment rating, raises questions about its resilience in the face of changing climate patterns and the potential for increased water flow in the future. Additionally, the lack of recent inspections and emergency preparedness measures highlight the importance of ongoing monitoring and maintenance to ensure the safety and effectiveness of the dam.
Year Completed |
1978 |
Dam Length |
550 |
Dam Height |
33.9 |
River Or Stream |
TR BIG RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
62 |
Nid Storage |
70 |
Structural Height |
36 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
36 |
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.
Lac Tiffany Dam