Beardsley Afterbay, located in Sonora, California, serves as a vital hydroelectric resource along the Middle Fork Stanislaus River.
Wind
Humidity
Built in 1958, this rockfill dam stands at a height of 33 feet, containing a maximum storage capacity of 355 acre-feet. With a primary purpose of hydroelectric power generation, Beardsley Afterbay plays a crucial role in providing sustainable energy to the region.
Managed by a public utility entity and regulated by the Department of Water Resources and the Federal Energy Regulatory Commission, Beardsley Afterbay boasts a low hazard potential and moderate risk assessment rating. Despite its age, the dam has undergone regular inspections and meets state jurisdiction and permitting requirements. While the spillway type is uncontrolled, the dam's structural integrity remains sound, ensuring the safety of the surrounding communities.
With its picturesque surroundings and functional design, Beardsley Afterbay stands as a testament to the intersection of water resource management and climate sustainability. As a key player in the local hydroelectric infrastructure, this dam continues to harness the power of the Middle Fork Stanislaus River while adhering to stringent regulatory standards and ensuring the safety of its operations.
Year Completed |
1958 |
Dam Length |
240 |
Dam Height |
33 |
River Or Stream |
Middle Fork Stanislaus River |
Primary Dam Type |
Rockfill |
Surface Area |
26 |
Hydraulic Height |
31.2 |
Nid Storage |
355 |
Structural Height |
33 |
Hazard Potential |
Low |
Nid Height |
33 |
| Location | Reservations | Toilets |
|---|---|---|
Beardsley Dam
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Beardsley Dam Campground
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TeleLi puLaya (Black Oak) Campground
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Fraser Flat Campground
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Fraser Flat
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Sand Bar Flat
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0.15 Mile Downstream From Road 4N26B To Confluence With Lilly Creek
One-Tenth Mile Downstream Of Coffin Hollow To Confluence With Bell Creek And Clavey River
Lilly Creek (Source At Chewing Gum Lake And Y Meadow Lake) To One-Tenth Mile Downstream Of Coffin Hollow
Clavey River At Confluence Of Bell And Lily Creeks To 3N01
One-Tenth Mile Upstream Of Crabtree Trailhead To 0.15 Mile Downstream Of Road 4N26B
Bell Creek Headwaters To One-Tenth Mile Upstream Of Crabtree Trailhead