Knightstown Group Site Dam 004-12 Reservoir Report
Nearby: David Jones Dam Theusen Lake Dam
Last Updated: December 12, 2025
Knightstown Group Site Dam 004-12, located in Grundy County, Missouri, serves the primary purpose of debris control along the Thompson River.
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Summary
Built in 1981, this earth dam stands 25 feet tall and spans 420 feet in length, with a storage capacity of 64 acre-feet. Despite its low hazard potential, the dam has a moderate risk assessment rating of 3 due to its location and potential impact on the surrounding area in the event of a failure.
Owned privately, Knightstown Group Site Dam 004-12 is not regulated or inspected by the state, with no enforcement or permitting requirements in place. The dam features an uncontrolled spillway and is constructed primarily of stone and soil materials. While the dam's condition assessment is currently listed as "Not Rated," the risk assessment highlights the need for ongoing monitoring and risk management measures to ensure the safety and integrity of the structure. With its location in a rural area and minimal associated structures, the dam plays a crucial role in mitigating debris and maintaining the flow of the Thompson River.
Year Completed |
1981 |
Dam Length |
420 |
Dam Height |
25 |
River Or Stream |
TR-THOMPSON RIVER |
Primary Dam Type |
Earth |
Surface Area |
1 |
Hydraulic Height |
25 |
Drainage Area |
54 |
Nid Storage |
64 |
Structural Height |
25 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Thompson River At Trenton
|
140cfs |
East Fork Big Creek Near Bethany
|
4cfs |
Medicine Creek Near Laredo
|
17cfs |
Grand River Near Gallatin
|
82cfs |
Thompson River At Davis City
|
22cfs |
Grand River At Chillicothe
|
361cfs |
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.
Knightstown Group Site Dam 004-12