Nestle Potato Effluent Lagoon Reservoir Report

Last Updated: December 13, 2025

Nestle Potato Effluent Lagoon, located in Grant County, Washington, is a privately owned earth dam constructed in 1994.


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Summary

With a hydraulic height of 32 feet and a capacity of 765 acre-feet, the lagoon serves as a storage facility for potato processing effluent. The lagoon covers a surface area of 659 acres and has a drainage area of 0.05 square miles, making it an offstream structure.

Regulated by the Washington Department of Ecology, the lagoon is subject to state permitting, inspection, and enforcement. Despite its low hazard potential, the dam's condition assessment is currently not rated. The lagoon's primary purpose is listed as "Other," indicating its unique role in managing waste from the potato processing industry. While the dam has not been modified in recent years, it is important to ensure that emergency action plans are in place to mitigate any potential risks associated with its operation.

Overall, Nestle Potato Effluent Lagoon plays a crucial role in managing waste and protecting water resources in the region. As water resource and climate enthusiasts, it is important to monitor the lagoon's condition and ensure that proper regulations and maintenance practices are in place to safeguard the surrounding environment. By staying informed and engaged, we can contribute to the sustainable management of water resources in our communities.

Year Completed

1994

Dam Length

1300

River Or Stream

Offstream

Primary Dam Type

Earth

Surface Area

659

Hydraulic Height

32

Drainage Area

0.05

Nid Storage

765

Structural Height

32

Hazard Potential

Low

Foundations

Rock

Nid Height

32
       
Seasonal Comparison

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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.