Grizzly Creek Reservoir Report

Last Updated: December 5, 2025

Grizzly Creek, located in Clipper Mills, California, is a privately owned dam constructed in 1964 for the primary purpose of water supply.


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Summary

It stands at a height of 50 feet with a hydraulic height of 43 feet, serving as a vital resource for both recreation and water supply in the region. The dam has a storage capacity of 76 acre-feet and covers a surface area of 6 acres, with a drainage area of 1 square mile.

Despite its importance, Grizzly Creek Dam has been assessed to be in poor condition with a significant hazard potential. The last inspection in April 2020 raised concerns about its structural integrity, prompting the need for regular monitoring and maintenance. The state regulatory agency, DWR Safety of Dams, oversees the permitting, inspection, and enforcement of safety measures to ensure the dam's compliance with regulations. As climate change continues to impact water resources, the management and maintenance of dams like Grizzly Creek are crucial to safeguarding communities and ecosystems in California.

Year Completed

1964

Dam Length

280

Dam Height

50

River Or Stream

Grizzly Creek

Primary Dam Type

Earth

Surface Area

6

Hydraulic Height

43

Drainage Area

1

Nid Storage

76

Hazard Potential

Significant

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.