Anderson Dam Reservoir Report

Last Updated: December 13, 2025

Anderson Dam, also known as Leroy Anderson Dam, is a private dam located in La Center, Washington.


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Summary

Built in 1987, it is primarily used for irrigation purposes along the Tr-Rock Creek. The dam is classified as a rockfill dam with a structural height of 15 feet and a length of 310 feet, providing a maximum storage capacity of 197 acre-feet.

Managed by the Washington Department of Ecology, Anderson Dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. While the dam has not been inspected recently, it is regulated, permitted, and inspected by the state agency to ensure its safety and compliance with regulations. With a drainage area of 0.41 square miles, the dam plays a crucial role in water resource management in the region.

Although Anderson Dam may not be as well-known as some larger dams, its importance in supporting irrigation and maintaining water resources in the area should not be overlooked. With its strategic location in Clark County, Washington, the dam serves as a vital infrastructure for water supply and resource management, contributing to the overall sustainability of the region's water ecosystem. For water resource and climate enthusiasts, Anderson Dam represents a key piece of the puzzle in ensuring the efficient use and conservation of water in the Pacific Northwest.

Year Completed

1987

Dam Length

310

River Or Stream

Tr-Rock Creek

Primary Dam Type

Rockfill

Surface Area

11

Hydraulic Height

15

Drainage Area

0.41

Nid Storage

197

Structural Height

15

Hazard Potential

Low

Foundations

Rock, Soil

Nid Height

15
       
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.