Mountain Pond Dam Reservoir Report

Last Updated: December 15, 2025

Mountain Pond Dam, also known as Broetje Mountain Pond Dam, is a privately owned structure in Walla Walla, Washington, designed for irrigation purposes.


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Summary

Completed in 1992, this earth dam stands at a hydraulic height of 40 feet and a structural height of 42 feet, with a storage capacity of 26 acre-feet. Situated on the Snake River offstream, the dam serves the crucial function of providing water for irrigation in the region.

Managed by the Washington Department of Ecology, the dam is subject to state regulation, inspection, and enforcement to ensure its safety and compliance with environmental standards. With a hazard potential rated as high and a fair condition assessment, the dam is regularly inspected every five years to monitor its structural integrity. Despite its relatively small surface area and drainage area, Mountain Pond Dam plays a significant role in supporting agricultural activities in the area, highlighting the importance of water resource management in a changing climate.

As climate change poses threats to water availability and quality, the maintenance and regulation of dams like Mountain Pond Dam become increasingly important in sustaining water resources for irrigation and other purposes. With its critical role in supporting agriculture in the region, ensuring the safety and efficiency of Mountain Pond Dam is essential for both water resource and climate enthusiasts who recognize the significance of water management in a changing environment.

Year Completed

1992

River Or Stream

Snake R. - Offstream

Primary Dam Type

Earth

Surface Area

2

Hydraulic Height

40

Drainage Area

0.01

Nid Storage

26

Structural Height

42

Hazard Potential

High

Foundations

Rock, Soil

Nid Height

42
       
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.