Promontory is an area of high ground in Box Elder County, Utah, United States, 32 mi west of Brigham City and 66 mi northwest of Salt Lake City. Rising to an elevation of 4,902 feet above sea level, it lies to the north of the Promontory Mountains and the Great Salt Lake. It is notable as the location of Promontory Summit, where the First transcontinental railro…Promontory is an area of high ground in Box Elder County, Utah, United States, 32 mi west of Brigham City and 66 mi northwest of Salt Lake City. Rising to an elevation of 4,902 feet above sea level, it lies to the north of the Promontory Mountains and the Great Salt Lake. It is notable as the location of Promontory Summit, where the First transcontinental railroad from Sacramento to Omaha in the United States was officially completed on May 10, 1869. The location is sometimes confused with Promontory Point, a location further south along the southern tip of the Promontory Mountains. Both locations are significant to the Overland Route; Promontory Summit is where the original, abandoned alignment crossed the Promontory Mountains while the modern alignment, called the Lucin Cutoff, crosses the mountains at Promontory Point.
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