State Route 106 (SR-106) is a state highway in the U.S. state of Utah, running northerly from Bountiful to Farmington. Most of the road is the old route of US-89/US-91, and once extended further along that old alignment in each direction. Route description The route begins at a partial diamond interchange at I-15 on exit 317. The highway heads east on 400 North, a four-lane undivided highway. The route continues through Bountiful and turns north on Main Street, a two-lane undivided road. The route continues north into Centerville. North of Chase Lane, the road begins turning northwest. By Lund Lane, the road heads due north again. By this point, the route becomes 200 East. As the highway enters Farmington, 200 East becomes State Street. Immediately after, the route turns north on Main Street. The route then turns northwest and continues in this manner until a diamond interchange with US-89 at exit 396, where it terminates. History SR-106 was created on May 12, 1931 as a bypass of State Route 1 (US-91) from southern Bountiful to northern Farmington. (This is now the route taken by US-89, mostly overlapping I-15, the former crossing of South 500 West and South Main Street in Bountiful and SR-273 in Farmington). US-91 was moved to the bypass, and, for a while, the old route (still SR-1) was signed as U.S. Route 91 Alternate. In 1953, the Utah State Legislature switched SR-1 and SR-106, taking SR-106 along the older route, and extended SR-106 north along former SR-1 to southern Layton (now exit 330 of I-15) in conjunction with a new bypass of SR-1 south of Layton. (The rest of old SR-106 in northern Farmington became an extension of SR-49, now US-89.) A minor change on May 8, 1961 moved SR-106 from Main Street west to 200 West through Bountiful, taking southbound SR-106 over the Parkin Overpass at its south end. SR-106 was further extended south along old SR-1 to the north side of Salt Lake City (I-15 exit 312) in 1962, when SR-1 was moved to match the planned Interstate 15, and north via Ogden to the Utah Hot Springs (I-15 exit 351) on November 25, 1966, replacing more of SR-1. This extension of SR-106 through Ogden only lasted until 1969; that year, the State Legislature removed the part between 200 North in Kaysville and the I-15 interchange (now exit 330) in southern Layton, and redesignated the