The Sac River Trail Marathon takes you from Shasta Dam to the Sundial Bridge via single track trails. It is fast and scenic, with 800' net elevation loss, no hills of significance! 1 mile on the dam, 21 miles single track dirt, and the last 4 on a paved bike path. The 15K race starts and finishes at the Dam and includes one big steep climb with great views and 5 single-track miles along the lakeshore. The 55K Ultramarathon combines the Marathon and 15K courses (one mile of overlap). All three races boast fantastic views of the three Shastas (mountain, lake, dam).
Local time: 4:40 AM
Check out the website for details and more pictures!