The races start in the parking lot at the north end of the lake at the foot of Sunset Boulevard.
It's a mostly flat, certified 4.5-mile loop on groomed dirt or asphalt path around scenic Lake Merced in San Francisco, California. There is approximately 100' of elevation gain and loss per loop. It's possible to run on the groomed dirt path about 90% of the loop.
Runners will enjoy one aid station per loop fully stocked with water, electrolytes, and a wide selection of foods. A second water drop will be provided half way through the loop. You will also have access to your vehicle and are allowed to set up supplies near the aid station.
Runners will be allowed to choose their distance during the race, but a runner can only be a finisher at one distance. Once reaching the 50 km. or 50 mi. point, a runner must decide whether to continue or stop. If the runner stops, he/she is a finisher in that race and his/her tag will be pulled. Choosing to go beyond the 50 km. / 50 mi. distance makes the runner an entrant and competitor in the next longer event. You cannot continue past one distance and decide later that you want to be scored in the earlier distance. If you have questions, please ask.
50 mile runners have one cutoff to meet based on a 15 min./mi. finishing pace:
They should finish their 10th lap (44.2 miles) by 11 hours, i.e. by 5:30 p.m., into the race.
For 100 km. runners, finishing pace is projected at 13 min./mile. Thus, 100 km. runners have two cutoffs to meet :
i) 10 hours 30 minutes (5:00 p.m.) at 48.7 miles (11 laps) and
ii) 12 hours and 30 minutes (7 p.m.) at 57.5 miles (13 laps) to be allowed to start the final, or 14th, lap.
Civil sunrise is at 6:48 am that day. The start is at 6:30, so you will be running in the dark for part of the first lap. Even though most of the route is on a public path, you might want to carry a light.
Civil sunset is at 7:02 pm that day. If you are in the 100 km and plan to take longer than 12.5 hours, you might need a light for that part, as well.
SPECIAL NOTE FROM THE RD:
Local time: 6:14 AM
You will, on race day, be free to run whatever distance you choose to at the Start or during the race itself. If you choose to go beyond a race distance, you will automatically be entered in the next higher race distance. If you stop in between race distances, you will not be given credit for the shorter distance i.e. you will DNF the entire race.
Rajeev Patel, Anil Rao & Steve Jaber