Lake Sam Hill Reservoir Report

Last Updated: December 6, 2025

Lake Sam Hill, also known as Dilly's Mill Camp Lake, is a private reservoir located in Pocahontas, West Virginia, near Thorny Creek.


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Summary

Built in 1958 for recreational purposes, this earth dam stands at a height of 35 feet and has a storage capacity of 160 acre-feet. With a surface area of 16 acres and a drainage area of 1.51 square miles, this picturesque lake offers a serene setting for water resource and climate enthusiasts to explore.

Managed by the West Virginia Department of Environmental Protection, Lake Sam Hill is regulated, permitted, inspected, and enforced to ensure its safety and compliance with state regulations. Although its condition assessment is currently not rated, the dam has a significant hazard potential, prompting a regular inspection frequency of every 3 years. While no emergency action plan (EAP) is currently prepared, the reservoir's risk management measures and inundation maps are yet to be determined, highlighting the importance of ongoing monitoring and assessment to safeguard this vital water resource.

Despite its tranquil surroundings and recreational appeal, Lake Sam Hill poses a significant risk if not properly managed and maintained. As climate change continues to impact water resources, it is essential for stakeholders and authorities to prioritize the safety and sustainability of this reservoir to protect both the environment and the community it serves. By implementing proactive measures and adhering to regulatory guidelines, Lake Sam Hill can continue to be a valuable asset for water enthusiasts while mitigating potential risks associated with its operation.

Year Completed

1958

Dam Length

450

Dam Height

35

River Or Stream

THORNY CREEK

Primary Dam Type

Earth

Surface Area

16

Hydraulic Height

32

Drainage Area

1.51

Nid Storage

160

Hazard Potential

Significant

Nid Height

35
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.