Relief Dam

Relief Dam is a rockfill dam on Summit Creek, a tributary of the Middle Fork Stanislaus River, in Tuolumne County, California. The dam is part of the Spring Gap-Stanislaus Hydroelectric Project, and is owned and operated by Pacific Gas and Electric (PG&E).^[1]^[2]

Completed in 1910, the dam stands 145 feet (44 m) above the riverbed and is 505 feet (154 m) long at the crest. Altogether it contains 136,984 cubic yards (104,732 m³) of fill.^[3] The dam forms Relief Reservoir, which has a storage capacity of 15,122 acre-feet (18,653,000 m³) of water and a full surface area of 189 acres (76 ha). The drainage basin behind the dam totals 24.51 square miles (63.5 km²).^[3]

The reservoir is primarily drawn down in the late summer and fall to supplement flows to the hydroelectric powerhouses at Donnells Dam and Beardsley Dam (part of the separate PG&E Tri-Dam Project) and others on the Stanislaus River.^[2]

References

38°16′53″N 119°44′01″W / 38.2814°N 119.7336°W / 38.2814; -119.7336

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[1] "Water Quality Certification | California State Water Resources Control Board".

[WQ-2] ttp://www.waterboards.ca.gov/waterrights/water_issues/programs/water_quality_cert/docs/springgap_stanislaus_ferc2130/401cert.pdf ^{[bare URL PDF]}

[CDEC-3] "California Data Exchange Center".

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