Near Mt. Baldy Village in Los Angeles County, California — The American West (Pacific Coastal)
Pomona Water Power Plant
Photographed By Joseph Beeman, March 8, 2006
1. Pomona Water Power Plant Marker
The first hydroelectric installation in California for long-distance transmission of alternating current at high voltage was built in 1892 on San Antonio Creek below this spot by the San Antonio Light and Power Company organized by Dr. Cyrus Grandison Baldwin, President of Pomona College. The first high-voltage transformers built by George Westinghouse for this installation provided for transmission of 10,000 volts from this plant to Pomona.
Erected 1955 by California State Park Commission and The Historic Society of Pomona Valley. (Marker Number 514.)
Topics and series. This historical marker is listed in these topic lists: Industry & Commerce • Notable Events. In addition, it is included in the California Historical Landmarks series list. A significant historical year for this entry is 1892.
Location. Marker has been reported missing. It was located near 34° 12.735′ N, 117° 40.564′ W. Marker was near Mt. Baldy Village, California, in Los Angeles County. Marker was on Mt Baldy Road (at milepost 2), 3 miles north of North Mountain Avenue, on the right when traveling north. Marker is in San Antonio Canyon, north of Upland, near the county line with San Bernadino County and just outside
this page online
Other nearby markers. At least 8 other markers are within 8 miles of this location, measured as the crow flies. Waiting Station (approx. 4.2 miles away); G.P. Ledig House (approx. 6 miles away); Demens-Tolstoy House (approx. 6.2 miles away); Schowalter Rock Pile (approx. 6.6 miles away); a different marker also named Schowalter Rock Pile (approx. 6.7 miles away); The I.W.Lord Home (approx. 7 miles away); Alta Loma Honor Roll (approx. 7 miles away); Cahuilla Park (approx. 7.2 miles away).
Photographed By Joseph Beeman, March 8, 2006
2. Pomona Water Power Plant Monument
Photographed By Joseph Beeman, March 11, 2006
3. In The Snow
Photographed By Craig Baker, May 4, 2020
4. Marker is Missing
Credits. This page was last revised on January 30, 2023. It was originally submitted on March 9, 2006, by Joseph Beeman of Upland, California. This page has been viewed 2,989 times since then and 64 times this year. Last updated on May 8, 2020, by Craig Baker of Sylmar, California. Photos: 1, 2. submitted on March 9, 2006, by Joseph Beeman of Upland, California. 3. submitted on March 12, 2006, by Joseph Beeman of Upland, California. 4. submitted on May 8, 2020, by Craig Baker of Sylmar, California. • Syd Whittle was the editor who published this page.
