Utah State Route 161

Located entirely in southeastern Millard County,[2] SR-161 starts at a diamond interchange with the westernmost exit on I-70 before it terminates at I-15. The road continues northward until it reaches the historic Cove Fort and the associated visitors center. On the eastern side of the highway is a Utah Department of Transportation (UDOT) maintenance center. SR-161 starts to make a gentle turn to the northeast, passing a filling station, which also serves as a rest area as part of a public–private partnership between UDOT and the owners of the station.[1] The highway intersects I-15 and comes to an end at a cattle guard on Black Rock Road northwest of the interchange with I-15.[3]

In 2007, a daily average of 455 cars traveled along SR-161, representing only a slight growth from previous years; in 2006, the average was 450 and in 2005, 415).[4] Thirty five percent of this traffic was composed of trucks.[5] The average traffic measurement is collected at a point on SR-161 between Cove Fort and the interchange with I-15.

The SR-161 designation has been used two other times for other state routes. The first route, which was formed in 1933, connected US-50/US-89/US-91 (now US-89) to SR-68 in Bluffdale until the route was decommissioned in 1953. From May 8, 1961 to February 14, 1964, the route number was used for a road from US-91 to I-15 in the city of Beaver.[6]

The parallel T-beam bridges that carry I-15 over SR-161 at its northern terminus were constructed in 1966 along with the construction of I-15 though the area.[7] The bridges carrying I-70 over SR-161 were constructed in 1973.[8][9]

The current route, codified into Utah law in 1965 and designated on signage following the decommissioning of US-91 in the 1970s, was partially a former alignment of US-91. Once I-70 was completed the 1.07 mi (1.72 km) long segment of US-91 as well as the roadway to the north was designated SR-161 by the Utah State Department of Highways. No significant changes have been made to the roadway except for its legal definition.[6] SR-161 serves the important function of providing access to the contracted rest area as well as the historic Cove Fort. As of 2009 no new projects are scheduled for SR-161, either through the American Recovery and Reinvestment Act or the UDOT Statewide Transportation Improvement Program.[10][11]

The entire route is in Millard County.

Location	mi[1]	km	Destinations	Notes
​	0.000– 0.080	0.000– 0.129	I-70 to I-15 – Richfield	Exit 1 on I-70; southern terminus.
​	2.812– 3.071	4.525– 4.942	I-15 – Cedar City, Salt Lake City	Exit 135 on I-15
​	3.084	4.963	Black Rock Road Cattle guard	Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi