Jones Dam Reservoir Report

Last Updated: December 13, 2025

Jones Dam, also known as Seely Dam, is a privately-owned structure located in La Center, Washington.


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Summary

Built in 1977, this earth dam serves primarily for irrigation purposes along Tr-Rock Creek. With a hydraulic height of 20 feet and a structural height of 15 feet, Jones Dam has a storage capacity of 100 acre-feet and covers a surface area of 22 acres.

Managed by the Washington Department of Ecology, Jones 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 and permitted by the state, with inspection and enforcement protocols in place. Situated in Congressional District 03, Washington, the dam's maximum discharge capacity reaches 610 cubic feet per second, ensuring effective water management and flood control in the area.

Overall, Jones Dam plays a crucial role in supporting agricultural activities in the region, providing essential irrigation water for farmers along Tr-Rock Creek. With its strategic location and modest storage capacity, the dam exemplifies the importance of sustainable water resource management in the face of changing climate conditions. For water resource and climate enthusiasts, Jones Dam serves as a significant landmark in the ongoing efforts to maintain a balance between human needs and environmental conservation.

Year Completed

1977

Dam Length

366

River Or Stream

Tr-Rock Creek

Primary Dam Type

Earth

Surface Area

22

Hydraulic Height

20

Drainage Area

0.75

Nid Storage

100

Structural Height

15

Hazard Potential

Low

Foundations

Soil

Nid Height

20
       
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.