Thoroughgood Lake # 5 Dam Reservoir Report

Last Updated: December 21, 2025

Thoroughgood Lake # 5 Dam, also known as City No.


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Summary

22, is a private dam located in Norfolk, Virginia. The dam's primary purpose is flood risk reduction, serving as a critical structure along Wolfson Creek and the Lynnhaven River. Standing at a height of 7 feet and stretching 150 feet in length, the dam has a storage capacity of 92 acre-feet, with a normal storage level of 27.4 acre-feet.

While Thoroughgood Lake # 5 Dam has not been inspected or rated for condition since August 2011, its hazard potential is deemed undetermined. The dam's design features a buttress core type with an undetermined foundation. Despite lacking recent data on inspection frequency and structural assessments, the dam continues to play a crucial role in managing flood risks in the region.

For water resource and climate enthusiasts, Thoroughgood Lake # 5 Dam presents an intriguing case study of a private structure designed for flood risk reduction in a vulnerable area. As its condition and hazard potential remain uncertain, further assessments and monitoring may be needed to ensure the dam's continued effectiveness in protecting the surrounding communities from potential water-related disasters.

Dam Length

150

Dam Height

7

River Or Stream

Wolfsnare Creek - VAHU6 CB25 Lynnhaven River

Surface Area

21.1

Nid Storage

92

Hazard Potential

Undetermined

Foundations

Unlisted/Unknown

Nid Height

7
       
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.