Relief

Relief is a rockfill dam located in Tuolumne County, California, built in 1909. It carries a High hazard potential classification and has a poor condition assessment.

About Relief

The primary purpose of Relief is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Pacific Gas And Electric Company (private). It impounds the Summit Creek near Baker Station.

The dam stands 140 feet tall and stretches 560 feet across, creates a reservoir covering 223 acres, and has a maximum storage capacity of 15,554 acre-feet. Completed in 1909, the structure is over a century old.

This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 09/17/2025.

At 140 feet, this dam is taller than 99% of all dams in the United States.

Living Downstream

If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The California dam safety program can provide more specific information about emergency planning for this structure.

Search for dams near your address to see all dams in your area with hazard classifications and safety data.

High HazardPoor ConditionEmergency Action Plan: Yes

Location

StateCalifornia
CountyTuolumne
Nearest CityBaker Station
River/StreamSummit Creek
Coordinates38.28120, -119.73370

Physical Characteristics

Dam TypeRockfill
NID Height140 ft
Dam Height140 ft
Dam Length560 ft
Year Completed1909 (117 years old)

Storage & Hydraulics

NID Storage15,600 acre-ft
Max Storage15,554 acre-ft
Normal Storage15,600 acre-ft
Surface Area223 acres
Max Discharge13,600 cfs
Spillway TypeUncontrolled

Ownership & Safety

PurposeHydroelectric
OwnerPacific Gas and Electric Company
Owner TypePrivate
Hazard ClassificationHigh
Condition AssessmentPoor
Last Inspection09/17/2025
Emergency Action PlanYes

Identifiers

NID IDCA00390
Federal IDCA00390
More InfoState Dam Safety Program

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