Ruth Anderson Memorial Endurance Run – Ultras 50K, 50M, 100K

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Date(s) - 04/21/2018
All Day

Lake Merced


Ruth Anderson Ultras 50K, 50M, 100K


A mostly flat, certified 4.5-mile loop on groomed dirt or asphalt path around scenic Lake Merced in San Francisco, California. The races start in the parking lot at the north end of the lake at the foot of Sunset Boulevard. Runners will enjoy two aid stations per lap stocked with water, electrolytes, and a selection of foods.

Format: Runners will be allowed to choose their distance during the race, but a runner can only be a finisher in one race. Once reaching 50K or 50M, a runner can stop or continue. If the runner stops, he/she is a finisher in that race and his/her tag will be pulled. Choosing to go beyond the 50K / 50M distance makes the runner an entrant and competitor in the next longer event.

50M runners have one cutoff to meet – they should finish their 10th lap (44.2 miles) by 12.5 hours, i.e. by 7 p.m., into the race.

In order to continue to the 100K distance a runner will have to meet two cutoffs:
i) 10 hours 50 minutes (5:20 p.m.) at 48.7 miles (11 laps) and
i) 12 hours and 30 minutes (7 p.m.) at 57.5 miles (13 laps) to be allowed to start the final, or 14th, lap.

Special Note from the RD

Dear Runner,

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

About Ruth P. Anderson

Ruth P. Anderson died Feb. 26, 2016. She was 86. Anderson was born July 27, 1929. She worked at Lawrence Livermore National Laboratory for 29 years as a nuclear chemist and gamma spectroscopist. She retired in 1991.

Anderson was a trailblazer in the running community. She started running in her mid-40s and raced until she was in her 70s, winning numerous age group awards. Anderson was very active in USA Track and Field (USATF) and was featured in Runner’s World Magazine in 1985 as an ultra-runner and pioneer of women’s running.

For complete and up to date information:  Ruth Anderson Ultras 50K, 50M, 100K

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