Patterson Creek No.27 Reservoir Report
Last Updated: December 5, 2025
Patterson Creek No.27, also known as Larenin Park Lake #27, is a flood risk reduction structure located in Mineral, West Virginia.
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Summary
Built in 1970 by the USDA NRCS, this earth dam stands at a height of 39 feet and has a hydraulic height of 32 feet. With a storage capacity of 297 acre-feet, it serves the primary purpose of flood risk reduction along the Patterson Creek.
Managed by the local government and regulated by the West Virginia Department of Environmental Protection, Patterson Creek No.27 has a fair condition assessment and a high hazard potential. Despite its moderate risk assessment rating, the dam has not undergone any major modifications since its completion. The dam's spillway type is uncontrolled, and it has an uncontrolled outlet gate.
Water resource and climate enthusiasts will find Patterson Creek No.27 to be an interesting case study in flood risk reduction infrastructure in West Virginia. Its location in the Pittsburgh District, along with its stone core and rock and soil foundations, make it a notable structure in the region. With its history of construction and maintenance, this dam serves as a critical component in managing water resources and mitigating flood risks in the area.
Year Completed |
1970 |
Dam Length |
450 |
Dam Height |
39 |
River Or Stream |
PATTERSON CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Hydraulic Height |
32 |
Drainage Area |
1.14 |
Nid Storage |
297 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
39 |
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.27