The Desert Research Institute, part of the Nevada System of Higher Education, has precisely mapped the Lincoln Highway through the Utah desert west of Salt Lake City.
Be sure to check out their photo tours of the 1913 and 1919 routes. It takes a little while to load, and there is no indication that a tour is loading, so be patient.
Thanks to Rachel Quist for the tip!
- Lincoln Highway — Through the Great American Desert, Desert Research Institute