U.S. Route 101
The nearly highway's northern terminus is in Tumwater, Washington: the route remains along the Olympic Peninsula's coastal perimeter west, north, and east; the northernmost point on the highway is in Port Angeles. The southern terminus of US 101 is in Los Angeles at the East Los Angeles Interchange, the world's busiest freeway interchange.
Utah State Route 101
After leaving Hyrum, SR-101 dips to the southeast again, entering the Uinta-Wasatch-Cache National Forest and a canyon formed by the Blacksmith Fork River. The final are inside the forest, serving as an access route to several campgrounds, as well as a diversion dam, and electric plant. The route comes to an end at the Hardware Ranch Wildlife Management Area, a working ranch owned and run by the state of Utah.