Lake Kilby Water Treatment Plant Sludge Lagoon Dam Reservoir Report

Last Updated: December 21, 2025

The Lake Kilby Water Treatment Plant Sludge Lagoon Dam in Suffolk, Virginia, serves as a crucial structure for the local government, with a primary purpose of managing residual waste.


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Summary

This earth dam, with a height of 30 feet and a length of 22,187 feet, plays a significant role in the treatment and disposal of sludge from the water treatment plant. The dam is regulated and inspected by the Department of Conservation and Recreation, ensuring its compliance with state regulations and enforcement measures.

Located near Lake Savage Mill Pond, the dam has a low hazard potential and is considered to be in fair condition as of the last assessment in April 2020. With a storage capacity of 228 acre-feet and a surface area of 21.2 acres, the dam plays a key role in managing water resources in the area. While the spillway is uncontrolled, the dam has a moderate risk assessment rating, indicating the need for ongoing monitoring and risk management measures to ensure the safety and effectiveness of the structure. Overall, the Lake Kilby Water Treatment Plant Sludge Lagoon Dam is a crucial component of the local water infrastructure, contributing to the sustainable management of water resources in the region.

Dam Length

22187

Dam Height

30

River Or Stream

Discharges to Lake Savage Mill Pond, then to Lake Meade (800013) and ultimately to Nansemond River -

Primary Dam Type

Earth

Surface Area

21.2

Drainage Area

0.05

Nid Storage

228

Outlet Gates

Uncontrolled - 0

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

30
       
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.