Harrison Twp Site Ca-89-G-H-10 Reservoir Report
Nearby: Hanes Lake Dam Leisure Lake Dam
Last Updated: December 12, 2025
Harrison Twp Site Ca-89-G-H-10, located in Grundy, Missouri, is a Grade Stabilization dam built in 1978 to control the flow of the Thompson River.
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Summary
This Earth dam stands at 30 feet high and stretches 660 feet long, with a storage capacity of 42 acre-feet. While it serves a primary purpose of Grade Stabilization, the dam also plays a crucial role in flood control and water resource management in the area.
Despite being rated as having a low hazard potential, the dam at Harrison Twp Site Ca-89-G-H-10 is considered to have a high risk due to its condition assessment not being rated and the absence of an Emergency Action Plan. With a drainage area of 165 square miles and a maximum discharge of 63 cubic feet per second, the dam's role in protecting the surrounding community from potential risks is significant. Climate and water resource enthusiasts would find this site intriguing for its blend of historical significance and modern-day importance in safeguarding the local environment.
Overall, Harrison Twp Site Ca-89-G-H-10 stands as a testament to the critical role that infrastructure plays in managing water resources and mitigating climate-related risks. Its presence in the Rock Island District of Missouri, under the oversight of local government authorities, underscores the collaborative efforts needed to ensure the safety and sustainability of water infrastructure in the face of changing environmental conditions. As climate change continues to impact water resources, sites like Harrison Twp serve as essential components of a larger strategy to adapt to and mitigate the challenges ahead.
Year Completed |
1978 |
Dam Length |
660 |
Dam Height |
30 |
River Or Stream |
TR-THOMPSON RIVER |
Primary Dam Type |
Earth |
Surface Area |
10 |
Hydraulic Height |
30 |
Drainage Area |
165 |
Nid Storage |
42 |
Structural Height |
32 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Thompson River At Trenton
|
143cfs |
Medicine Creek Near Laredo
|
20cfs |
Grand River Near Gallatin
|
76cfs |
East Fork Big Creek Near Bethany
|
4cfs |
Grand River At Chillicothe
|
361cfs |
Locust Creek Near Linneus
|
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.
Harrison Twp Site Ca-89-G-H-10