Ruth Anderson Memorial Endurance Run

OCT
10
2026
Test your endurance at Lake Merced in San Francisco with a scenic 4.5 mile loop course. Choose between a standard run or tackle ultra marathon distances including the 50K and 50 mile events.
Sat 10 Oct 2026
50 miles 50 kilometers 5 miles

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Ruth Anderson Memorial Endurance Run

The Ruth Anderson Memorial Endurance Run takes place at Lake Merced in San Francisco, California. The event utilizes a circular course around the lake, starting from the parking lot located on the north side of Lake Merced Boulevard. The route consists of a 4.5-mile loop that participants follow to complete their chosen distance.

The event offers several distance options for participants:

  • 50K ultra marathon
  • 50 Miles ultra marathon
  • 4.5 Miles coastal testing run

The course is set within a recreational area and provides a consistent loop format for those undertaking the endurance distances. Participants follow the paved pathway that circles the perimeter of the lake. Visit the organization's website for the most recent information.

50 mi
50mi
50 km
50k
5 mi
Coastal Testing
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