Parleys Canyon is a canyon located in the U.S. state of Utah. The canyon provides the route of Interstate 80 (I-80) (and previously the Lincoln Highway, U.S. Route 40, and a railroad) up the western slope of the Wasatch Mountains and is a relatively wide, straight canyon other than near its mouth. The mountain pass at the top of the canyon is known as Parleys Summit. With an elevation of , the pass is the highest point along I-80 in the state of Utah. Both features are named for Parley P. Pratt, an early settler of the Salt Lake Valley and leader of the Church of Jesus Christ of Latter-day Saints who surveyed the area to find a better transportation route through the Wasatch Mountains than the previous route which traversed Emigration Canyon. Description Parleys Canyon begins where I-215 merges into I-80 in Salt Lake City and ends at Parleys Summit. The lower part of the canyon is relatively twisty and narrow and had to be dynamited to make way for I-80. Despite this, the interstate remains six or more lanes wide throughout the canyon; it is built over Parleys Creek in many places. Work is also underway to extend the Parleys Trail multi-use path through this segment to improve non-motorized access. The canyon widens dramatically near Mountain Dell Dam and Utah State Route 65 (SR-65) splits from the freeway (which turns southeast temporarily) to provide access to Morgan County to the northeast. SR-65 also provides a connection to a local road leading over the ridge to Emigration Canyon in the same area where the Mormon trail crossed into that canyon. Little Dell Dam can be seen higher up on the side of Parleys Canyon in this area. As the freeway turns back toward the east, there is also an exit for the road leading up Lambs Canyon (a side canyon of Parleys Canyon).The area around Parleys Summit is part of the Summit Park census-designated place (CDP). However, this area is more commonly referred to as Jeremy Ranch or Parleys Summit. A $5m wildlife overpass was completed in December 2018 to allow wildlife to cross I-80 safely. The overpass is 50 feet wide and 320 feet long; animals near that location by exit 140 are funneled onto the overpass with 3.5 miles of fencing. Here the canyon is wide enough to form large communities along the sides of the freeway