Salt Flats Endurance Runs Share: Arts, Entertainment, and Recreation Salt Flats Endurance Runs Visit Website Request Info Tooele, UT 84074 (801) 821-9445 Facebook About Map About Ultra distance foot races held at the edge of Utah & Nevada. Run on the internationally known Bonneville Salt Flats of Utah. 100 mile, 50 mile & 50k distances the first weekend of May each year. What's Nearby? Distance: 5 10 15 20 25 50 mi.