Transcontinental Railroad Grade Road — Promontory Summit to Golden Spike NHS

The original transcontinental railroad grade across Promontory Summit in northern Utah was abandoned in 1904 when the Lucin Cutoff bridged the Great Salt Lake and made this route obsolete. What was left behind is one of the most historically loaded dirt roads in the American West. The auto tour route runs roughly 10 miles along the preserved grade near Golden Spike National Historical Site, but the real overlanding stretch extends further along the Promontory Peninsula — past the two preserved steam engine replicas at the spike site, through open sagebrush flats, and across the shoulder of Promontory Mountains with wide views of the Great Salt Lake glittering in both directions. Watch for the original grading cuts, culverts, and fill sections — civil engineering from 1868 that still holds its shape.

This is an easy to moderate route on graded dirt and native surface roads — suitable for most high-clearance 2WD rigs in dry conditions, though wet weather makes the clay sections genuinely problematic. No technical obstacles. Permits are required to access the Golden Spike NHS auto tour portion ($10/vehicle). Nearest fuel is in Brigham City, roughly 30 miles south. Best April through October before snow closes the upper roads. A remarkable route for history-minded overlanders who want context with their miles.