Smith Brothers Dairy Storage Lagoon Reservoir Report

Last Updated: December 15, 2025

Located in Grant County, Washington, the Smith Brothers Dairy Storage Lagoon is a private earth dam structure completed in 2001.


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Summary

Designed by BRAD CARD of PLSA Engineers, this off-stream tributary to Crab Creek serves as a crucial water storage facility for the dairy operation. With a maximum storage capacity of 109 acre-feet and a normal storage capacity of 91 acre-feet, the lagoon covers a surface area of 12.87 acres and has a drainage area of 10.5 acres.

Standing at a structural height of 15 feet and a hydraulic height of 11 feet, the Smith Brothers Dairy Storage Lagoon poses a low hazard potential and is currently rated in "Not Rated" condition. Regulated by the Washington Dept of Ecology, this dam undergoes state permitting, inspection, and enforcement to ensure its safety and compliance with regulations. While the dam has not been assessed for its emergency action plan or risk management measures, it remains a vital resource for water storage in the region.

Overall, the Smith Brothers Dairy Storage Lagoon plays a significant role in supporting the agricultural activities of the dairy industry in the area. With its strategic location and efficient design, this earth dam structure provides essential water storage for the operation, contributing to the overall sustainability of water resources in Grant County, Washington. Maintaining its functionality and safety through regular inspections and regulatory oversight, the lagoon stands as a testament to responsible water resource management in the region.

Year Completed

2001

Dam Length

2400

River Or Stream

OFF-STREAM TRIB TO CRAB CREEK

Primary Dam Type

Earth

Surface Area

12.87

Hydraulic Height

11

Drainage Area

10.5

Nid Storage

109

Structural Height

15

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

15
       
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.