Quincy Brine Evaporation Ponds Reservoir Report

Last Updated: December 15, 2025

The Quincy Brine Evaporation Ponds in Grant, Washington, are a fascinating example of water resource management by the local government.


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Summary

These ponds, completed in 1989, serve a primary purpose of "Other" and are used for brine evaporation. With a hydraulic height of 11 feet and a storage capacity of 258.7 acre-feet, these ponds cover a surface area of 25.27 acres and are regulated by the Washington Department of Ecology.

Despite being classified as having a "Significant" hazard potential, the condition assessment of the Quincy Brine Evaporation Ponds is rated as "Fair." The last inspection in August 2019 found that the ponds met regulatory standards, with inspections conducted every 5 years to ensure their continued safety and operation. The ponds have a history of compliance with state regulations, including permitting, inspection, and enforcement, highlighting their importance in the regional water resource management.

With their unique purpose and design, the Quincy Brine Evaporation Ponds stand as a testament to innovative water management solutions in Washington. As a vital part of the local government's infrastructure, these ponds play a crucial role in the evaporation process and are subject to ongoing monitoring and maintenance to ensure their continued functionality and safety for the surrounding environment and community.

Year Completed

1989

Primary Dam Type

Earth

Surface Area

25.27

Hydraulic Height

11

Nid Storage

258.7

Structural Height

11

Hazard Potential

Significant

Nid Height

11
       
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.