Dog Hollow Reservoir Report

Last Updated: December 5, 2025

Dog Hollow, a federal-owned reservoir located in Langell Valley, Oregon, serves a primary purpose of irrigation and is managed by the Bureau of Land Management.


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Summary

Built in 1959, this gravity dam has a hydraulic height of 13 feet and a structural height of 17 feet, with a storage capacity of 530 acre-feet. The reservoir, situated on the East Branch Lost River, covers an area of 1000 acres and has a maximum discharge of 488 cubic feet per second.

Despite being classified as having a low hazard potential, Dog Hollow has not undergone a recent condition assessment and is currently not rated for its overall state. The last inspection took place in September 2016, with a scheduled inspection frequency of every 5 years. The reservoir features a slide (sluice gate) outlet gates for water release. The surrounding area, managed by the Bureau of Land Management, offers a vital water resource for agricultural purposes in the region.

For water resource and climate enthusiasts, Dog Hollow presents an intriguing case study of a mid-century irrigation reservoir that continues to provide essential water supply for the local community. With its historical significance and ongoing management by federal agencies, this gravity dam stands as a testament to the intersection of water management, infrastructure development, and environmental stewardship in the Klamath region of Oregon.

Year Completed

1959

Dam Length

1

River Or Stream

E. BRANCH LOST RIVER

Primary Dam Type

Gravity

Surface Area

1000

Hydraulic Height

13

Nid Storage

530

Structural Height

17

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

17
       
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.