Utah State Route 128

State Route 128
Upper Colorado River Scenic Byway Dinosaur Diamond Prehistoric Highway
State Route 128 delineated in red
Route information
Defined by Utah Code §72-4-118
Maintained by UDOT
Length:	44.56 mi (71.72 km)
Existed:	1933 – present
Major junctions
South end:	US-191 near Moab
North end:	I-70 / US-6 / US-50 near Cisco
Highway system
State highways in Utah Interstate US State Scenic ← SR-127 SR-130 →

State Route 128 (SR-128) is a 44.564-mile-long (71.719 km) state highway in the U.S. state of Utah. The entire length of the highway has been designated the Upper Colorado River Scenic Byway, as part of the Utah Scenic Byways program. This road also forms part of the Dinosaur Diamond Prehistoric Highway, a National Scenic Byway. Residents of Moab frequently refer to SR-128 as "the river road", after the Colorado River, which the highway follows.

The highway was originally constructed to connect rural cities in eastern Utah with Grand Junction, Colorado, the largest city in the region. Part of the highway was merged into the Utah state highway system in 1931; the rest was taken over by the state and assigned route number 128 in 1933. Today, the highway is used as a scenic drive for visitors to the area.

The highway crosses the Colorado River at the site of the Dewey Bridge, listed on the National Register of Historic Places. This bridge was the longest suspension bridge in Utah until April 2008 when it was destroyed by a fire started by a child playing with matches. The future of the bridge is uncertain, with Grand County conducting a study to determine the feasibility of reconstructing it.

SR-128 begins just north of Moab, where it is commonly known as "the river road". The highway follows the southern bank of the Colorado River through a narrow, steep gorge, described as spectacular by National Geographic. The sheer sandstone walls of the gorge along Route 128 are recommended for their beauty on vacation guides from as far away as France and Germany.