Nemacolin Reservoir Report
Nearby: Hobo Ventures Cokeburg
Last Updated: December 13, 2025
Nemacolin, located in Washington, Pennsylvania, is a privately owned dam that serves the primary purpose of irrigation.
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Summary
Built in 1964, this earth dam stands at a height of 46 feet and has a length of 340 feet. With a storage capacity of 82 acre-feet and a normal storage level of 42 acre-feet, Nemacolin covers a surface area of 4.1 acres and drains an area of 0.31 square miles.
This dam on TR Pike Run is regulated by the Pennsylvania Department of Environmental Protection, ensuring that it meets state standards for inspection, enforcement, and permitting. Despite its low hazard potential, Nemacolin is assessed to be in fair condition as of its last inspection in June 2016. The dam has a designated emergency action plan (EAP) and is subject to regular inspections every five years to maintain its safety and functionality.
For water resource and climate enthusiasts, Nemacolin presents an interesting case study in private dam ownership and management in Pennsylvania. With its historical significance and role in supporting local irrigation needs, this earth dam stands as a testament to the importance of effective regulation and maintenance to ensure the safety and sustainability of water infrastructure in the face of changing environmental conditions.
Year Completed |
1964 |
Dam Length |
340 |
Dam Height |
46 |
River Or Stream |
TR PIKE RUN |
Primary Dam Type |
Earth |
Surface Area |
4.1 |
Drainage Area |
0.31 |
Nid Storage |
82 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
46 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Fork Tenmile Creek At Jefferson
|
69cfs |
Redstone Creek At Waltersburg
|
42cfs |
Monongahela River At Elizabeth
|
21100cfs |
Youghiogheny River At Sutersville
|
1160cfs |
Monongahela River Near Masontown
|
4890cfs |
Dunkard Creek At Shannopin
|
201cfs |
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.
Nemacolin
East Fredricktown