[7] Passenger trains on the branch usually operated only during the summer, however, while railroad-operated bus service on the Lund-Cedar City state highway ran year round.
[10] A second connection between SR-19 and SR-1, following Midvalley Road past Enoch, became State Route 199 in 1935[11] but was given back to the county in 1943.
[21] In 1969, the section to the north limit of Boulder (at the Dixie National Forest boundary) became part of SR-12, and the rest was dropped.
The road from Parowan northeast through Paragonah and southwest through Summit was added to the state highway system in 1910,[24] and in the 1920s it became part of SR-1 and US-91.
This short remainder was deleted in 1969, and the number was reused in 1975 to designate a highway that currently runs from Henefer to I-84.
[36] Originally, this route was added in 1941 as a branch of SR-18 from Enterprise west to Nevada, where SR 75 continued as a shortcut to Panaca,[37] but was split off as SR-120 in 1945.
[38] The route number was immediately reused to designate a new SR-120 which doubles as Interstate 70 Business (Richfield, Utah).
State Route 134 was established on May 9, 1939 and ran from SR-35 about six miles north of Duchesne northward to Mountain Home.
State Route 135 was established on June 26, 1933 as the highway from Delta via Oak City to the boundary of Fishlake National Forest in Millard County.
State Route 136 was established on June 26, 1933 as the road from Kanab west to Johnson Canyon, then north to Alton.
[46] State Route 140 was established on June 26, 1933 as the road from SR-27 (now US-6) near Hinckley south to Deseret and east via Oasis to SR-26 (now US-50) at Harding.
State Route 144 was established on June 26, 1933 and ran from SR-1 (US-91, now I-15) near the Washington/Iron county line westward via New Harmony to the Dixie National Forest boundary.
The route number was reused in 1978, when the state legislature designated SR-145 as the road from SR-68 in Saratoga east to US-89 in American Fork.
This was deleted in 1969, and the route number was immediately reused as the road from SR-39 at Huntsville north and east around Pineview Reservoir to SR-162 in Eden.
State Route 170 originally connected Richmond at SR-1 (now US-91) west via Trenton to Clarkston at SR-142 in Cache County.
[56] The route number was briefly reused from 1992 to 1993 for a cutoff between US-50 and SR-24 near Aurora, but was renamed soon after to SR-260 to avoid confusion from having SR-170 and I-70 in such close proximity.
[58] The route number went empty until 1985, when it was used to designate 5600 West south of I-80 in Salt Lake City as a state highway.
State Route 182 was created in 1935, running along 20th Street from SR-1 (US-89) east to the former campus of the Utah Schools for the Deaf and the Blind at Monroe Boulevard.
State Route 183 was created in 1935 to serve the Ogden-Weber Applied Technology College near the south end of SR-235 (Washington Boulevard).
State Route 194 was established in 1947 from US-89 in Richfield westward via 300 S and southward via 400 W to US-89, as the old State Route 194 (established in 1935) went from North Salt Lake City on SR-1 northeasterly via Orchard Drive to Val Verda, thence northerly via 400 East through Centerville to Chase Lane, thence west to SR-1 and was deleted that year.
This route number will be repurposed in 2019 for the east–west segment of the Mountain View Corridor freeway project in Utah County.
State Route 196 ran from Peoa at former SR-35 (now SR-32), southwest through Browns Canyon to former SR-6 (now US-40) in Summit County, a distance of roughly 7 miles (11 km).
A connection from the Deseret Chemical Depot north to SR-73 near its west end, constructed with federal aid in 1942, was designated as State Route 198 in 1945.
[66] The old route of SR-104 east of SR-205 was removed from the state highway system, and is now Wilson Lane and Exchange Road.
State Route 215 was designated in 1968 as the road from SR-26 6 miles southwest of Lynndyl northwest to the Topaz Mountains.
State Route 216 was designated in 1941 from SR-53 in Myton southeast 7-mile (11 km) via Sand Wash Road to Castle Peak Gilsonite mines.
In 1964, SR-87 was significantly expanded, and the entirety of this original route was transferred to SR-87, with SR-221 being realigned to go from Altamont, north to Altonah.
State Route 222 ran from US-189 (then numbered SR-7) near Deer Creek Reservoir southeast to the town of Wallsburg, covering a little over 3 miles (4.8 km).
State Route 250 was created in 1953 as a connection from SR-24 between Loa and Lyman north to the 90° turn in SR-72,[83] but was given back to the county in 1969.
This route was deleted in 1985 when ferry service between Bullfrog Basin and Halls Crossing began, as it became part of SR-276.