Patterson Creek No.25 Reservoir Report
Last Updated: December 5, 2025
Patterson Creek No.25, also known as Johnson Run, is a key water resource structure located in Mineral, West Virginia.
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Summary
Owned by the local government, this dam serves the primary purpose of flood risk reduction and is regulated by the West Virginia Department of Environmental Protection. Constructed in 1975 by the USDA NRCS, this earth dam stands at 59 feet tall and spans 450 feet in length, with a storage capacity of 399 acre-feet and a drainage area of 1.03 square miles.
With a high hazard potential and a satisfactory condition assessment as of 2014, Patterson Creek No.25 plays a crucial role in managing flood risks in the region. The dam features uncontrolled spillways and outlet gates, with a stone core and foundations made of rock and soil. Despite its moderate risk assessment, the dam has not undergone recent modifications and is inspected biennially to ensure its continued effectiveness in protecting the surrounding communities and environment. As a significant flood control structure, Patterson Creek No.25 serves as a vital component of the water resource infrastructure in the area, contributing to the overall resilience of the watershed.
Year Completed |
1975 |
Dam Length |
450 |
Dam Height |
59 |
River Or Stream |
JOHNSON RUN |
Primary Dam Type |
Earth |
Surface Area |
3 |
Hydraulic Height |
57 |
Drainage Area |
1.03 |
Nid Storage |
399 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
59 |
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.
Patterson Creek No.25