Virtual Tour of US 99
Osito Canyon
Three Mile Grade / Oak Flat
Three Mile Grade goes between Frenchman’s Flat to Whitaker Summit. The Oak Flat Ranger Station has been a stop along this highway for a long time. Here, campgrounds and water are available for use to the public. This is about half way down Three Mile Grade. As a side note, Oak Flat was formed when a large portion of the mountain above slid down many thousands of years ago.
