State Route 170 (SR 170) is the designation given to Riverside Road from Interstate 15 (I-15) Exit 112 to former SR 144 in downtown Mesquite. All of SR 170 was, at one time, U.S. Route 91, which used to stretch from Sweetgrass, Montana to Long Beach, California. It is also called Bunkerville Road and Riverside Road.

The entire route is in Clark County.