Dennis Patterson Reservoir Report
Nearby: Lake Viking Dam Nancy Inderwiesen Dam
Last Updated: January 11, 2026
Dennis Patterson is a privately owned Earth dam located in Daviess, Missouri, along the TR-Grand River.
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Summary
Built in 2000 by the USDA NRCS, this structure serves as a Fish and Wildlife Pond with additional purposes including Fire Protection, Stock, Grade Stabilization, and Recreation. The dam stands at a height of 34 feet with a hydraulic height and structural height of 36 feet, providing a storage capacity of 18 acre-feet and a surface area of 4 acres.
Despite being categorized as having a low hazard potential, Dennis Patterson has a moderate risk assessment rating of 3. The dam features an uncontrolled spillway with a width of 10 feet and has no outlet gates. With a drainage area of 102.4 square miles, the structure can handle a maximum discharge of 2.2 cubic feet per second. Although the condition assessment is listed as "Not Rated," the last inspection was conducted in May 2000, with an inspection frequency of every 5 years.
Enthusiasts of water resources and climate will find Dennis Patterson to be a fascinating example of a privately owned dam designed for multiple purposes beyond just flood protection. With its location in a scenic area along the TR-Grand River, this structure not only serves practical functions but also provides opportunities for wildlife habitat and recreational activities. As the risk assessment indicates a moderate level of potential issues, ongoing monitoring and maintenance of Dennis Patterson will be essential to ensure its continued safety and effectiveness for both the environment and the community.
Year Completed |
2000 |
Dam Length |
261 |
Dam Height |
34 |
River Or Stream |
TR-GRAND RIVER |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
34 |
Drainage Area |
102.4 |
Nid Storage |
18 |
Structural Height |
36 |
Outlet Gates |
None |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
36 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Grand River Near Gallatin
|
353cfs |
East Fork Big Creek Near Bethany
|
40cfs |
Thompson River At Trenton
|
528cfs |
Shoal Creek Near Braymer Mo
|
117cfs |
Grand River At Chillicothe
|
361cfs |
Medicine Creek Near Laredo
|
112cfs |
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.
Dennis Patterson