Groff Lake Dam Reservoir Report
Last Updated: December 6, 2025
Groff Lake Dam, located in Henry County, Missouri, was completed in 1940 and serves multiple purposes including fire protection, stock, and small fish pond maintenance.
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Summary
This private dam, with a height of 25 feet and a storage capacity of 67 acre-feet, is primarily used for recreational activities. Situated along the TR-Sand Creek, the dam has a low hazard potential and has not been officially rated for its condition.
Although Groff Lake Dam is not regulated by the state of Missouri, it is managed by its private owner and does not fall under federal jurisdiction. The dam's earth structure with buttress core design ensures its stability and functionality. With a surface area of 5 acres and a drainage area of 40 acres, the dam provides a tranquil escape for water resource and climate enthusiasts in the CALHOUN area. While its spillway type and maximum discharge capacity are unspecified, the dam's modest size and purpose make it a valuable asset for the local community.
Year Completed |
1940 |
Dam Height |
25 |
River Or Stream |
TR-SAND CREEK |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
40 |
Nid Storage |
67 |
Structural Height |
25 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
25 |
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.
Groff Lake Dam