Cadman Lewisville S&G Pit Reservoir Report

Last Updated: December 13, 2025

Cadman Lewisville S&G Pit is a privately owned structure located in Clark County, Washington, with a primary purpose classified as "Other." This Earth-type dam was completed in 2007 and stands at a hydraulic height of 39 feet with a length of 1400 feet.


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Summary

The dam has a storage capacity of 293 acre-feet, with a normal storage level of 266 acre-feet and a drainage area of 13.75 square miles. The structure is state-regulated by the Washington Dept of Ecology, with inspection, permitting, and enforcement measures in place to ensure its safety and compliance.

Despite being designated as having a high hazard potential, Cadman Lewisville S&G Pit has been assessed to be in satisfactory condition as of March 2021. The dam has a scheduled inspection frequency of 5 years, with the last inspection date recorded in February 2020. Emergency action plans are in place, although it is unclear if they meet guidelines or if inundation maps have been prepared. The structure is not under the jurisdiction of the US Army Corps of Engineers, and there is limited information available on risk assessment, management measures, and other regulatory aspects. Overall, Cadman Lewisville S&G Pit presents an intriguing case study for water resource and climate enthusiasts interested in the management and safety of privately owned dams in the Pacific Northwest.

Year Completed

2007

Dam Length

1400

Primary Dam Type

Earth

Hydraulic Height

39

Drainage Area

13.75

Nid Storage

293

Hazard Potential

High

Foundations

Soil

Nid Height

39
       
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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.