Racers begin from the South Sourdough Trailhead parking lot (start line) head north on the trail to Brainard Lake Road.  There, the 18K racers will turn around at Brainard Lake Road and return to the South Sourdough Trailhead (finish line).  The 30K racers will continue across Brainard Lake Road following the Sourdough Trail loop and returning back to Brainard Lake Road and then on to the South Sourdough Trailhead (finish line). Note: if you are running the 30K, the cutoff to Brainard Lake Rd is 12 PM. If you reach there after 12 PM please turn around with the 18K runners. This is an honor system, so please be safe and be smart. You will not be disqualified, you will just be listed as an 18K runner instead of a 30K runner for finishing times.