Angeles National Forest in Los Angeles County, California — The American West (Pacific Coastal)

Pomona Water Power Plant

Therudebud (CC BY-SA 3.0) courtesy of Wikimedia Commons, 2012

1. Pomona Water Power Plant Marker

Inscription.
The first hydro-electric 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 Historical 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 in Angeles National Forest, California, in Los Angeles County. It was on Mount Baldy Road 3 miles north of Mountain Avenue, on the right when traveling north. Touch for map. Marker was in this post office area: Mt Baldy CA 91759, United States of America. Touch for directions.

Regionally, this marker was in Greater Los Angeles

and in the Transverse Ranges.

It was also on the American Pacific Coast.

Globally, it was in North America,

on the Ring of Fire,

in the Pacific Rim,

in the Western Hemisphere,

in the Western World,

and in the Anglosphere.

Historically, it found itself in what was once New Spain

and also Mexico’s Alta California.

Other nearby markers. At least 8 other markers are within 7 miles of this location, measured as

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the crow flies: Waiting Station (approx. 4.2 miles away); Jaeger Park (approx. 6 miles away); G.P. Ledig House (approx. 6 miles away); June Vail Park (approx. 6.1 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); Chaparral Park (approx. 6.7 miles away).

Pomona Water Power Plant Marker image. Click for full size.

Photographed by Joseph Beeman, March 8, 2006

2. Pomona Water Power Plant Marker

Photographed by Joseph Beeman, March 11, 2006

3. In The Snow

Marker is Missing image. Click for full size.

Photographed by Craig Baker, May 4, 2020

4. Marker is Missing

Credits. This page was last revised on January 17, 2026. It was originally submitted on March 9, 2006, by Joseph Beeman of Upland, California. This page has been viewed 4,457 times since then and 78 times this year. Last updated on May 8, 2020, by Craig Baker of Sylmar, California. Photos: 1. submitted on October 15, 2024, by Craig Baker of Sylmar, California. 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.