Johnson Log Sorting Pond Reservoir Report

Last Updated: December 14, 2025

Johnson Log Sorting Pond, located in Coquille, Oregon, is a state-owned structure managed by the Oregon Water Resources Department.


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Summary

This Earth-type dam, completed in 1951, stands at a height of 11 feet and serves as a vital component in the Coquille River watershed. With a storage capacity of 491 acre-feet and a surface area of 82 acres, the pond plays a crucial role in water resource management and log sorting activities in the region.

The dam, with a structural height of 12.5 feet and a hydraulic height of 9 feet, features a slide (sluice gate) outlet gate for water release. Despite being classified as a low hazard potential structure, Johnson Log Sorting Pond is subject to regular inspections by state regulatory agencies to ensure its safety and functionality. With a history dating back to the mid-20th century, this pond continues to play a significant role in the local ecosystem and water management practices.

Situated within the Portland District of the US Army Corps of Engineers, Johnson Log Sorting Pond remains a key feature in the Coquille River landscape. As climate change impacts water resources worldwide, structures like this play a crucial role in maintaining water quality, quantity, and flow for both human and environmental needs. Climate enthusiasts and water resource professionals alike can appreciate the importance of this state-regulated dam in sustaining the delicate balance of the Coquille River ecosystem.

Year Completed

1951

Dam Length

7480

Dam Height

11

River Or Stream

COQUILLE RIVER

Primary Dam Type

Earth

Surface Area

82

Hydraulic Height

9

Nid Storage

491

Structural Height

12.5

Outlet Gates

Slide (sluice gate)

Hazard Potential

Low

Nid Height

13
       
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.