Promontory, Utah, is east of which mountains?

Answer 1

Promontory Point is a locale in southern Box Elder County, Utah, centered approximately at 41°13′20″N, 112°24′38″W, with an elevation of 1285 meters (4217 feet) above sea level. [1] It is located on a promontory (peninsula) in the northern part of the Great Salt Lake.

Promontory Point is also the cape where this place is located, centered approximately at 41°12′18″N, 112°25′43″W, with an elevation of 1309 meters (4297 feet) above sea level. [2] It is the location of the northern Utah weather radar.

Both of these is the point where the Union Pacific and Central Pacific railroad companies met, to form the Trans-Continental Railroad. For that reference, see Promontory Summit near Promontory, Utah. Promontory Point is, however, on the later Lucin Cutoff, built to bypass the Summit.

Answer 2

Strangely enough, the mountain range is called Promontory mountains.

http://www.nps.gov/archive/gosp/research/promontory_hist.htm