Patterson Creek # 2 Dam Reservoir Report
Last Updated: December 5, 2025
Patterson Creek # 2 Dam, located in Lahmansville, West Virginia, was designed by the USDA NRCS and completed in 1972 with the primary purpose of flood risk reduction.
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Summary
This earth-type dam stands at a height of 57.5 feet, with a hydraulic height of 51.5 feet and a length of 550 feet. It has a maximum storage capacity of 1029.3 acre-feet and a normal storage of 36.6 acre-feet, serving the Patterson Creek river.
The dam is regulated by the West Virginia Department of Environmental Protection's Division of Water and Waste Management (DWWM) and undergoes regular inspections, with a hazard potential rated as high. While the condition assessment is not rated, the risk assessment is moderate. The emergency action plan (EAP) was last revised in May 2014, and the dam has not been modified in recent years. Despite being uncontrolled, the spillway type and outlet gates present unique engineering features that contribute to the dam's effective flood risk reduction capabilities.
In conclusion, Patterson Creek # 2 Dam plays a crucial role in managing flood risk in the region, demonstrating a blend of efficient design and strategic location along the Patterson Creek river. Enthusiasts of water resources and climate management will find this dam's data and characteristics intriguing, showcasing the intersection of engineering, environmental regulations, and risk assessment in ensuring the safety and stability of water infrastructure.
Year Completed |
1972 |
Dam Length |
550 |
Dam Height |
57.5 |
River Or Stream |
TR-PATTERSON CREEK |
Primary Dam Type |
Earth |
Surface Area |
7.4 |
Hydraulic Height |
51.5 |
Nid Storage |
1029.3 |
Outlet Gates |
Uncontrolled |
Hazard Potential |
High |
Foundations |
Rock, Soil |
Nid Height |
58 |
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 # 2 Dam
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