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Grace in Caribou County, Idaho — The American West (Mountains)
 

Lucius Lucien Nunn - Power Pioneer

 
 
Lucius Lucien Nunn - Power Pioneer Marker image. Click for full size.
Photographed by Roger Scot Johns, July 17, 2025
1. Lucius Lucien Nunn - Power Pioneer Marker
Inscription.

"[Grace Dam] is the greatest development of hydraulic power between the Mississippi and California rivers. It is said to be the greatest, with the exception of Niagara Falls, in the world" - Salt Lake Herald, June 15, 1908.

Between 1883 and 1927, western states led the nation in the development of hydroelectric power. Grace hydroelectric dam and power plant were built during that age of development.

Lucien Lucius Nunn, regarded by many as the "father of the electric power industry in the Intermountain West," was the mastermind behind the Grace development.

Powering the West
An entrepreneur, lawyer, and businessman, Nunn built the Grace Power Plant as part of an empire of hydroelectric projects in Utah and Idaho. Between the early 1890s and the 1910s, Nunn operated twenty hydroelectric plants in Colorado, Utah, Idaho, and Montana.

Before he moved to Utah and Idaho, Nunn operated gold mines in Colorado. Steam power was used to operate machinery and smelters necessary for processing gold. Nunn's brother Paul developed hydropower technology as a cheaper alternative to steam. In 1890, with financial backing from
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electricity mogul George Westinghouse, Nunn used the new technology to generate power at the Gold King Mine on the San Miguel River in Colorado. Hydropower revolutionized the electrical industry.

Stepping Stone to Idaho
His successful production of power in Colorado was a stepping stone for Nunn's involvement in the commercial development of hydroelectricity to produce power for the mining industry.

Nunn's interest shifted from mining to the long-distance transmission of hydroelectric power for commercial use. He sent agents to Utah to search for potential dam sites for power plants. Nunn built numerous plants in Utah, then seeking new locations, moved north into Idaho.

In April 1906, surveyors for Nunn's company arrived in Grace, where the Bear River had great hydroelectric potential. The Grace hydroelectric power plant was completed in 1908 and began transmitting power to Salt Lake City.

When completed, the 11,000 kilowatt plant was one of the largest power plants in the area and over time was integrated into one of the first power grids in the Intermountain West.

Captions
View of Bear River Canyon, circa 1907. (Image
Lucius Lucien Nunn - Power Pioneer Marker image. Click for full size.
Photographed by Roger Scot Johns, July 17, 2025
2. Lucius Lucien Nunn - Power Pioneer Marker
courtesy PacifiCorp).

Lucien Lucius Nunn, circa 1890. Image courtesy Special Collections, J. Willard Marriott Library, University of Utah.

Construction crew building Grace Dam, November 1907. (Image courtesy PacifiCorp).

The completed Grace project included the powerhouse, dam, flowline, and surge tank. (Image courtesy PacifiCorp).

Project completed in cooperation with: Lhtact2, Idaho Transportation Department, Idaho State Historical Society
 
Topics. This historical marker is listed in this topic list: Bridges & Viaducts. A significant historical year for this entry is 1907.
 
Location. 42° 35.151′ N, 111° 43.773′ W. Marker is in Grace, Idaho, in Caribou County. It is at the intersection of North Main Street (Idaho Route 34 at milepost 46) and Grace Dam Road, on the right when traveling north on North Main Street. The marker is 450 feet northeast of the intersection on Grace Dam Road at the river access parking area. Touch for map. Marker is at or near this postal address: 705 N Main St, Grace ID 83241, United States of America. Touch for directions.

Regionally, this marker is in Idaho’s Bear River Country. It is also in the
Lucius Lucien Nunn - Power Pioneer Marker image. Click for full size.
Photographed by Roger Scot Johns, July 17, 2025
3. Lucius Lucien Nunn - Power Pioneer Marker
The subject marker is on the right.
American Mountain West. Globally, it is in North America, the Western Hemisphere, the Western World, and the Anglosphere.

Other nearby markers. At least 8 other markers are within 5 miles of this marker, measured as the crow flies: History of the Turner Road Penstock Bridge (here, next to this marker); Last Chance Canal Co. Ltd. (approx. half a mile away); Black Canyon Gorge (approx. 1.3 miles away); Last Chance Canal (approx. 1.4 miles away); Lava Flows and Wagon Trains (approx. 4 miles away); California dreaming in 1841 (approx. 4 miles away); Horatio's Journey (approx. 4½ miles away); Guiding Landmark... (approx. 4½ miles away). Touch for a list and map of all markers in Grace.
 
More about this marker. The marker is the second to left of four metal panels arrayed along the river below the dam.
 
 
Credits. This page was last revised on July 29, 2025. It was originally submitted on July 18, 2025, by Roger Scot Johns of Eagle, Idaho. This page has been viewed 105 times since then and 15 times this year. Photos:   1. submitted on July 18, 2025, by Roger Scot Johns of Eagle, Idaho.   2, 3. submitted on July 19, 2025, by Roger Scot Johns of Eagle, Idaho. • J. Makali Bruton was the editor who published this page.
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Jul. 10, 2026