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(2017) NEW SORINI 25 has been approved by USFS Beaverhead and Deer Lodge National Forest & BSB (use of Thompson park is shared by both).
Race Route includes Blacktail, Thompson park, some of the trails the Butte 100 & Butte 50 follow on the South Loop.
The Butte 100 Races thanks USFS Dave Sabo & Jocelyn Dodge and BSB Parks, JP Gallagher.