Orchards Block 92 Dam Reservoir Report

Last Updated: December 15, 2025

Orchards Block 92 Dam, located in Walla Walla, Washington, was completed in 1992 and serves the primary purpose of irrigation.


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Summary

This earth dam, with a hydraulic height of 22 feet and a length of 475 feet, holds a maximum storage capacity of 54 acre-feet and a normal storage capacity of 45 acre-feet. The dam is situated on the Unnamed Tr - Snake R. river or stream and covers a surface area of 2.8 acres with a drainage area of 0.01 square miles.

Managed by a private owner, the Orchards Block 92 Dam is regulated by the Washington Department of Ecology and undergoes regular inspections and enforcement to ensure its structural integrity. With a low hazard potential, the dam has not been rated for condition assessment, and emergency action plans are currently not available. Despite this, the dam continues to play a crucial role in supporting irrigation activities in the region and maintaining water resources for agricultural purposes.

In the event of any potential risks or incidents, the lack of detailed emergency preparedness and risk assessment measures for the Orchards Block 92 Dam raises concerns for the safety and management of the structure. As a vital component of the local water resource infrastructure, further attention and investment may be needed to enhance the dam's resilience and ensure sustainable water management practices in the area.

Year Completed

1992

Dam Length

475

River Or Stream

Unnamed Tr - Snake R.

Primary Dam Type

Earth

Surface Area

2.8

Hydraulic Height

22

Drainage Area

0.01

Nid Storage

54

Structural Height

22

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

22
       
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.