Cedar Grove Lake Reservoir Report

Last Updated: December 13, 2025

Cedar Grove Lake in Clackamas, Oregon, is a private reservoir primarily used for irrigation purposes.


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Summary

Managed by the Oregon Water Resources Department, this earth dam structure stands at a height of 11 feet and has a storage capacity of 14.2 acre-feet. Located on the Sorenson River, this significant water resource is regulated and inspected by state authorities to ensure its safety and compliance with regulations.

The dam features a slide gate as its outlet control, with a notable hazard potential categorized as significant. Although the condition assessment is not rated, the last inspection in June 2018 highlights the proactive approach to monitoring and maintaining the structure. Despite lacking certain data points such as completion year and surface area, Cedar Grove Lake remains a vital component of the local water infrastructure, contributing to irrigation needs in the Molalla area.

As a key asset in the Portland District, Cedar Grove Lake serves as a critical water source for agricultural activities in the region. With its state-regulated status and regular inspections, the dam ensures the safe management of water resources and underscores the importance of sustainable water practices in the face of changing climate conditions. Enthusiasts of water resources and climate resilience will find Cedar Grove Lake a fascinating case study in water infrastructure management and the intersection of human needs with environmental stewardship.

Dam Height

11

River Or Stream

SORENSON

Primary Dam Type

Earth

Nid Storage

14.2

Outlet Gates

Slide (sluice gate)

Hazard Potential

Significant

Nid Height

11
       
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.