(Francisco Kjolseth | The Salt Lake Tribune) The Avenues Ridgeline Trail is a new trail (combining parts of old trails + some totally new) with sweeping views of the Salt Lake Valley from the “summit.” The highlights of the trail right now are beautiful yellow leafy arnica, which are everywhere, along with Missouri milkvetch. Though numerous variations exist It's about 3 miles long and not too difficult except for a couple short, steep climbs. The trail is primarily used for hiking, mountain biking, running and nature trips. May 12, 2021.