Upper Theisman Dam Reservoir Report

Last Updated: December 5, 2025

Upper Theisman Dam, located in Loudoun, Virginia, is a privately-owned Earth dam with a primary purpose of recreation.


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Summary

The dam has a height of 25 feet and a length of 225 feet, providing a storage capacity of 33.1 acre-feet. Situated on the Limestone Branch tributary, this dam serves as a picturesque destination for water resource and climate enthusiasts to enjoy outdoor activities in a serene natural setting.

Although the hazard potential of Upper Theisman Dam is currently undetermined and its condition has not been rated, its recreational offerings and scenic surroundings make it a popular spot for visitors seeking a peaceful escape. With a surface area of 1.5 acres and a normal storage capacity of 10.5 acre-feet, the dam provides opportunities for boating, fishing, and other leisure activities for locals and tourists alike. While details about its construction year and modifications remain unknown, Upper Theisman Dam continues to attract individuals looking to immerse themselves in the beauty of the Virginia countryside.

As a vital part of the community's recreational infrastructure, Upper Theisman Dam stands as a testament to the importance of preserving natural resources for future generations to enjoy. While its regulatory oversight and inspection frequency may be limited, the dam's role in providing a tranquil setting for outdoor enthusiasts remains paramount. Whether visitors come to appreciate the dam's engineering marvel or simply to bask in its scenic beauty, Upper Theisman Dam serves as a reminder of the symbiotic relationship between water resources and recreational enjoyment in a changing climate landscape.

Dam Length

225

Dam Height

25

River Or Stream

Limestone Branch tributary

Primary Dam Type

Earth

Surface Area

1.5

Hydraulic Height

25

Nid Storage

33.1

Structural Height

25

Hazard Potential

Undetermined

Nid Height

25
       
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.