Agate Reservoir Report

Last Updated: December 5, 2025

Agate Dam, also known as A-18, is a federal-owned structure located in White City, Oregon.


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Summary

Built in 1965 by the Bureau of Reclamation, this rockfill dam stands at a height of 77 feet and serves primarily for irrigation purposes in the region. With a storage capacity of 5700 acre-feet and a normal storage level of 4780 acre-feet, Agate Dam plays a crucial role in managing water resources for agriculture in the area.

Situated on Dry Creek, Antelope Creek, and other water bodies, Agate Dam covers a surface area of 216 acres and has a drainage area of 10 square miles. The dam's maximum discharge capacity is 3530 cubic feet per second, ensuring effective flood control measures in times of heavy rainfall. Despite its high hazard potential, the condition assessment of Agate Dam is currently not available, highlighting the importance of regular inspections and risk management measures to ensure the safety and functionality of this vital water infrastructure.

Managed and operated by the Bureau of Reclamation, Agate Dam stands as a testament to the agency's commitment to water resource management and irrigation development in the region. With its strategic location and significant storage capacity, Agate Dam continues to play a crucial role in supporting agricultural activities and water supply for the local community. As climate change impacts water availability and distribution, structures like Agate Dam will be essential for sustainable water management practices in the face of evolving environmental challenges.

Year Completed

1965

Dam Length

3800

Dam Height

77

River Or Stream

DRY CREEK, ANTELOPE CR.& OTHER

Primary Dam Type

Rockfill

Surface Area

216

Hydraulic Height

68

Drainage Area

10

Nid Storage

5700

Structural Height

86

Hazard Potential

High

Foundations

Rock

Nid Height

86
       
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.