Springvalley Lane Dam Reservoir Report

Last Updated: December 5, 2025

Springvalley Lane Dam, located in Loudoun, Virginia, is a privately owned structure regulated by the Department of Conservation and Recreation.


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Summary

Standing at a height of 20 feet with a length of 270 feet, this earth dam holds a storage capacity of 69.6 acre-feet and serves as a vital component in managing water resources in the area. The dam is situated on the Tan Branch river and plays a crucial role in flood control and water supply management.

While the hazard potential of the dam is currently classified as undetermined and its condition is not rated, it is subject to regular inspections and regulatory oversight to ensure its safety and reliability. The dam's primary purpose is classified as 'other', indicating its multifaceted role in water resource management. Despite lacking certain data points such as the year of completion and specific spillway details, the Springvalley Lane Dam remains an essential infrastructure for the local community and contributes to the overall resilience of the water system in the region.

With a storage capacity of 69.6 acre-feet and a surface area of 5.1 acres, Springvalley Lane Dam plays a crucial role in controlling water flow and mitigating potential risks associated with flooding in the area. Although certain details about the dam's construction and history are not provided, its strategic location and state regulation highlight its significance in water resource management in Loudoun, Virginia. For water resource and climate enthusiasts, Springvalley Lane Dam serves as a fascinating case study in private ownership, state regulation, and the intersection of infrastructure with environmental stewardship.

Dam Length

270

Dam Height

20

River Or Stream

Tan Branch

Primary Dam Type

Earth

Surface Area

5.1

Hydraulic Height

20

Nid Storage

69.6

Structural Height

20

Hazard Potential

Undetermined

Nid Height

20
       
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.