The Headwaters 50k course is a scenic, loop-type course through the Klamath Mountains of Northern California, west of Mt. Shasta.
The Headwaters 10k is a fast, flat counter-clockwise loop around Lake Siskiyou. The course is entirely on the Lake Siskiyou recreation trail. Incredible views of the lake backdropped by Mt. Shasta and Mt. Eddy abound.