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| Salt Springs Dam | |
|---|---|
| Name | Salt Springs Dam |
| Location | Near Pollock Pines, El Dorado County, California, United States |
| Coordinates | 38.7790°N 120.6020°W |
| Status | Operational |
| Opening | 1931 |
| Owner | Pacific Gas and Electric Company |
| Dam type | Concrete multiple-arch |
| Height | 136 ft (41 m) |
| Length | 1,090 ft (332 m) |
| Reservoir | Salt Springs Reservoir |
| Capacity | 45,000 acre-feet |
| Catchment | 80 sq mi (207 km²) |
| Surface | 1,100 acres (4.5 km²) |
Salt Springs Dam
Salt Springs Dam is a concrete multiple-arch dam on the North Fork of the Mokelumne River in El Dorado County, California, United States. Built in the early 20th century as part of a hydroelectric development, the structure impounds Salt Springs Reservoir and forms a key component of Pacific Gas and Electric Company's PG&E hydroelectric network in the Sierra Nevada foothills. The site is within proximity to Eldorado National Forest and serves multiple roles in power generation, water storage, flood control, and recreation.
Salt Springs Dam is situated approximately 40 miles east of Sacramento, California and near the community of Pollock Pines, California, creating a reservoir used for regional hydroelectric generation and limited municipal water supply. Its construction completed in 1931 established a high-elevation impoundment that supports downstream facilities including the Tiger Creek Hydroelectric Development and contributes to the broader Mokelumne River watershed infrastructure. The dam's concrete multiple-arch design places it among a class of engineered works influenced by early 20th-century advances in structural engineering and hydroelectric expansion led by companies such as Pacific Gas and Electric Company.
The genesis of the dam traces to the 1920s when private energy firms sought to harness Sierra Nevada river systems for electricity to serve growing urban centers like San Francisco and Stockton, California. The project was developed by entities that later consolidated under Pacific Gas and Electric Company, aligning with contemporaneous projects on the American River and Stanislaus River. Construction commenced in the late 1920s amid nationwide infrastructure investment during the interwar period and was completed in 1931. Engineering leadership drew on practices refined in other high-profile projects such as Hoover Dam (contemporary but larger) and incorporated multiple-arch masonry techniques used at sites like Condit Dam—though Salt Springs employed reinforced concrete arches unique to its canyon geometry. Labor and workforce issues during construction intersected with regional economic patterns influenced by the onset of the Great Depression.
Salt Springs Dam is a concrete multiple-arch dam spanning a steep granite canyon on the North Fork Mokelumne. The structure features a series of arches supported by buttresses, optimizing material use while resisting hydrostatic pressure, an approach influenced by the work of engineers associated with projects like Walter L. Huber's contemporaneous designs. The dam's crest length is approximately 1,090 feet with a structural height near 136 feet. Outlet works include a low-level outlet conduit, gated spillway, and penstocks feeding the hydroelectric turbines downstream at facilities tied into the PG&E Mokelumne River Hydroelectric Project. Instrumentation and monitoring systems have been retrofitted over decades, reflecting standards promulgated by agencies such as the California Department of Water Resources and the Federal Energy Regulatory Commission.
Salt Springs Reservoir occupies a high-elevation basin collecting runoff from an 80-square-mile watershed dominated by mixed-conifer forest within Eldorado National Forest and adjoining public lands. Seasonal inflows derive from snowmelt and convective precipitation patterns characteristic of the Sierra Nevada, modulated by climate drivers such as the Pacific Decadal Oscillation and episodic atmospheric river events. The reservoir's storage capacity, roughly 45,000 acre-feet, buffers downstream flows into the Mokelumne River system and supports peaking operations at downstream powerhouses. Water surface elevation fluctuates seasonally and interannually, influenced by drought episodes linked to the California droughts of the 20th and 21st centuries and managed under state water-rights and licensing frameworks associated with PG&E.
Operational control of Salt Springs Dam is under Pacific Gas and Electric Company within the licensing and oversight regime of the Federal Energy Regulatory Commission and the California State Water Resources Control Board. The dam serves primarily for hydroelectric generation in coordination with downstream pumped-storage and peaking plants, grid dispatch schedules, and regional load demands affecting urban centers such as San Francisco Bay Area and Sacramento. Emergency action planning and safety inspections follow guidelines from bodies like the U.S. Army Corps of Engineers and the California Governor's Office of Emergency Services. Maintenance has included seismic retrofits, spillway upgrades, and modernization of intake gate assemblies to meet evolving standards after statewide dam-safety evaluations prompted by incidents at facilities including Oroville Dam.
The impoundment has altered hydrology and habitat connectivity for native species in the Mokelumne watershed, affecting anadromous fish runs historically supported by tributaries of the San Joaquin River system. Changes in flow regime, temperature stratification in the reservoir, and barrier effects have prompted mitigation measures including managed flow releases, fish passage planning, and habitat restoration projects coordinated with agencies such as the California Department of Fish and Wildlife and environmental organizations active in the region. Vegetation changes along the shoreline have influenced habitat for species associated with Sierra Nevada ecosystems, and water-quality monitoring addresses issues linked to nutrient cycling and episodic algal blooms observed in western reservoirs during warm seasons.
Salt Springs Reservoir and surrounding lands provide recreational opportunities within the context of Eldorado National Forest and county-managed facilities, drawing visitors for boating, fishing, camping, and hiking. Access is regulated via recreation permits and seasonal road conditions influenced by snowpack and wildfire closures, with nearby attractions including Jenkinson Lake and trailheads for routes into the Sierra. Public safety advisories, boating restrictions, and interpretive information are coordinated by El Dorado County parks and recreation divisions in partnership with PG&E to balance recreational use with operational and environmental constraints.
Category:Dams in California Category:Hydroelectric power stations in California