Fourth Creek Reservoir Reservoir Report

Last Updated: December 5, 2025

Fourth Creek Reservoir, located in Coos County, Oregon, is a private water supply reservoir with a primary purpose of providing water for various uses.


°F

°F

mph

Wind

%

Humidity

Summary

Constructed in 1930, this Earth dam stands at a height of 12 feet and has a storage capacity of 21 acre-feet. The reservoir covers a surface area of 5.2 acres and has a drainage area of 1.2 square miles, with a maximum discharge capacity of 70 cubic feet per second.

Managed by the Oregon Water Resources Department, Fourth Creek Reservoir is a significant water resource in the area, serving as a vital source for the surrounding community. Although the dam is rated as having a significant hazard potential, its condition is currently not rated, indicating the need for further assessment and potential risk management measures. With its picturesque location and important role in water supply, Fourth Creek Reservoir is a key asset in Oregon's water infrastructure.

As a private facility, Fourth Creek Reservoir is subject to state regulation, permitting, inspection, and enforcement to ensure its safety and compliance with water resource management standards. While specific details on emergency action plans and risk assessments are not provided in the data, the reservoir's ownership and management fall under private entities, highlighting the importance of proper maintenance and monitoring to safeguard this valuable water source for the future.

Year Completed

1930

Dam Length

380

Dam Height

12

River Or Stream

FOURTH CREEK

Primary Dam Type

Earth

Surface Area

5.2

Hydraulic Height

9

Drainage Area

1.2

Nid Storage

21

Structural Height

12

Outlet Gates

Needle

Hazard Potential

Significant

Nid Height

12
       
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.