(Francisco Kjolseth | The Salt Lake Tribune) The Mounted Posse for the Salt Lake County Sheriffs Office arrives to celebrate the ribbon cutting of Butterfield Trailhead Regional Park on Thursday, Aug. 31, 2023. Open to multiple users—hikers, equestrians, trail runners, and mountain bikers—the new park in the Oquirrhs offers 14 miles of trail with plans for expansion south of the Kennecott mine.