The Santa Ana River Hydroelectric System
Creators: name: Swanson, Mark T.
name: De Vries, David
Publisher: name: SRI Press
Year: 1994
Subjects: subject: San Bernardino Mountains
valueUri: https://core.tdar.org/browse/geographic-keyword/7725/san-bernardino-mountains
subject: Santa Ana River
valueUri: https://core.tdar.org/browse/geographic-keyword/7871/santa-ana-river
subject: Santa Ana Canyon
valueUri: https://core.tdar.org/browse/geographic-keyword/24786/santa-ana-canyon
subject: San Bernardino County
valueUri: https://core.tdar.org/browse/geographic-keyword/54500/san-bernardino-county
subject: City of Los Angeles
valueUri: https://core.tdar.org/browse/geographic-keyword/82682/city-of-los-angeles
subject: Mentone
valueUri: https://core.tdar.org/browse/geographic-keyword/82683/mentone
subject: Historic
valueUri: https://core.tdar.org/browse/temporal-keyword/5728/historic
subject: Late Nineteenth - Early Twentieth Century
valueUri: https://core.tdar.org/browse/temporal-keyword/5011/late-nineteenth-early-twentieth-century
subject: Historic Los Angeles
valueUri: https://core.tdar.org/browse/culture-keyword/8481/historic-los-angeles
subject: Historic
valueUri: https://core.tdar.org/browse/culture-keyword/25/historic
subject: Euroamerican
valueUri: https://core.tdar.org/browse/culture-keyword/28/euroamerican
subject: Santa Ana River No. 2
valueUri: https://core.tdar.org/browse/site-name/81042/santa-ana-river-no-2
subject: Santa Ana River No. 1
valueUri: https://core.tdar.org/browse/site-name/81041/santa-ana-river-no-1
subject: Santa Ana River No. 3
valueUri: https://core.tdar.org/browse/site-name/81043/santa-ana-river-no-3
subject: Resource Extraction / Production / Transportation Structure or Features
valueUri: https://core.tdar.org/browse/site-type/272/resource-extraction-production-transportation-structure-or-features
subject: Power Canal
valueUri: https://core.tdar.org/browse/site-type/1810/power-canal
subject: Canal or Canal Feature
valueUri: https://core.tdar.org/browse/site-type/275/canal-or-canal-feature
subject: Hydroelectric generators
valueUri: https://core.tdar.org/browse/site-type/2179/hydroelectric-generators
subject: Water Control Feature
valueUri: https://core.tdar.org/browse/site-type/279/water-control-feature
subject: Wood
valueUri: https://core.tdar.org/browse/material-type/15/wood
subject: Ceramic
valueUri: https://core.tdar.org/browse/material-type/1/ceramic
subject: Glass
valueUri: https://core.tdar.org/browse/material-type/6/glass
subject: Building Materials
valueUri: https://core.tdar.org/browse/material-type/8/building-materials
subject: Metal
valueUri: https://core.tdar.org/browse/material-type/11/metal
subject: Architectural Documentation
valueUri: https://core.tdar.org/browse/investigation-type/16/architectural-documentation
subject: Historic Background Research
valueUri: https://core.tdar.org/browse/investigation-type/18/historic-background-research
subject: Consultation
valueUri: https://core.tdar.org/browse/investigation-type/4/consultation
subject: Heritage Management
valueUri: https://core.tdar.org/browse/investigation-type/24/heritage-management

description: TThe Southern California Edison Company Santa Aria River Hydroelectric System, which is located within the Area of Potential Effects of the Seven Oaks Dam Project, has been determined eligible for listing in the National Register of Historic Places by the U.S. Army Corps of Engineers (Corps), in consultation with the State Historic Preservation Officer. Powerhouse No. 1 of this system is located outside the project area and will suffer no direct impacts. Powerhouse No. 2 is located at 2,350–2,520 feet AMSL, which is below the estimated 100-year depth of sediment elevation. Therefore, the powerhouse will be subject to burial due to sediment accumulation over the life of the project. Powerhouse No. 3 will not be directly affected by the project. The transmission lines and the aqueduct system will be relocated and other associated historic elements may be destroyed. These project effects are considered to be adverse, and mitigation measures were required. Mitigation measures include documentation of the system in accordance with the National Park Service standards for the Historic American Engineering Record (HAER). In addition, selected features of the historic hydroelectric system will be salvaged and removed to an appropriate site for curation. The selection of the features shall be done by the Corps in consultation with the Southern California Edison Company and the State Historic Preservation Officer. These mitigation measures are stipulated in a Memorandum of Agreement (MOA) signed by the Corps, the California State Historic Preservation Officer, the Advisory Council on Historic Preservation, Southern California Edison Company, and the San Bernardino National Forest.