Berthoud Pass, Colorado

The pass is located west of Denver, and provides a high route between upper Clear Creek Canyon to the upper valley of the Fraser River in Middle Park to the north. The pass traverses the continental divide at the Front Range, on the border between Clear Creek County and Grand County

The pass is named for Edward L. Berthoud, the chief surveyor of the Colorado Central Railroad during the 1870s. Accompanied by Jim Bridger, Berthoud discovered the pass in July 1861 while surveying a possible route for the railroad. Berthoud reported that the pass was suitable as a wagon road, but not as a railroad. The pass has steep grades on either side (6.3%), along with winding switchbacks and many tight spots.

The pass is currently the route of U.S. Highway 40, north of its junction with Interstate 70 in Clear Creek Canyon. It provides the fastest road access to Winter Park and a secondary route to Steamboat Springs from Denver and the Colorado Front Range. However, the pass is one of the most notoriously difficult passes in Colorado for motorists, based on its height as well as the large number of switchbacks on the southern side of the pass.

Wikipedia.com