Pasco Process Water Reuse Storage Lagoon Reservoir Report

Last Updated: December 15, 2025

The Pasco Process Water Reuse Storage Lagoon is a vital water resource infrastructure located in Franklin County, Washington.


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Summary

Owned by the local government, this facility was designed by JUB Engineers and completed in 1997. It serves as a storage lagoon for process water reuse, with a maximum storage capacity of 231 acre-feet and a normal storage capacity of 352 acre-feet.

Situated offstream from the Columbia River, this Earth-type dam stands at a height of 18 feet and has a length of 2700 feet. Despite its fair condition assessment and high hazard potential, the Pasco Process Water Reuse Storage Lagoon has undergone regular inspections and is regulated by the Washington Department of Ecology. Its strategic location in Pasco, Washington, makes it a crucial component of the local water management system.

With a focus on water reuse and conservation, the Pasco Process Water Reuse Storage Lagoon plays a significant role in sustainable water resource management in the region. As a key infrastructure for storing and reusing process water, it helps mitigate water scarcity issues and ensures a reliable water supply for various industrial and agricultural activities. Supported by state-level permitting, inspection, and enforcement measures, this facility underscores the importance of responsible water resource management in the face of climate change challenges.

Year Completed

1997

Dam Length

2700

Dam Height

18

River Or Stream

OFFSTREAM-COLUMBIA R.

Primary Dam Type

Earth

Surface Area

1.5

Hydraulic Height

18

Nid Storage

352

Structural Height

18

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

18
       
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.