Fish Lake Reservoir Report

Last Updated: December 5, 2025

Fish Lake in Oregon is a captivating water resource managed by the Bureau of Reclamation for flood risk reduction, hydroelectric power generation, irrigation, and recreation purposes.


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Summary

This rockfill dam, completed in 1907, stands at a height of 46 feet with a hydraulic height of 28 feet and a structural height of 50 feet. The dam has a storage capacity of 9,397 acre-feet, covering a surface area of 415 acres and serving a drainage area of 24 square miles.

Located in Jackson County, Fish Lake is situated along Little Butte Creek and offers a picturesque setting for outdoor enthusiasts to enjoy various recreational activities. With a spillway width of 311 feet and a maximum discharge of 1,700 cubic feet per second, the dam's high hazard potential is mitigated through regular inspections and risk assessments. The dam underwent modifications in 1997 to enhance its hydraulic, seismic, and structural integrity, ensuring the safety and reliability of this vital water resource for the surrounding community.

Fish Lake's rich history and ongoing management by the Bureau of Reclamation make it a significant landmark in Oregon's water infrastructure landscape. With its multiple purposes and strategic location, Fish Lake continues to play a crucial role in flood control, water supply, and recreational opportunities for residents and visitors alike. Its engineering design, operational efficiency, and regulatory oversight contribute to the sustainable utilization of this valuable water resource amidst changing climate conditions and evolving water management practices.

Years Modified

1997 - Hydraulic, 1997 - Seismic, 1997 - Structural

Year Completed

1907

Dam Length

1020

Dam Height

46

River Or Stream

LITTLE BUTTE CREEK

Primary Dam Type

Rockfill

Surface Area

415

Hydraulic Height

28

Drainage Area

24

Nid Storage

9397

Structural Height

50

Hazard Potential

High

Foundations

Rock

Nid Height

50
       
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.