Interstate 84 in Utah

This article is about the section of Interstate 84 in Utah. For the entire length of the highway, see Interstate 84 (west).

Interstate 84
Route information
Defined by Utah Code §72-4-114
Maintained by UDOT
Length:	119.77 mi (192.75 km)
Existed:	1956 – present
Major junctions
West end:	I-84 at Idaho state line
	I-15 near Tremonton US-91 in Willard I-15 in Riverdale US-89 in Uintah
East end:	I-80 near Echo
Highway system
Main route of the Interstate Highway System Main • Auxiliary • Business State highways in Utah Interstate • US • State (Parks) • Scenic ← SR-83 SR-85 →

In the U.S. state of Utah, Interstate 84 heads southeast from the Idaho state line, overlapping Interstate 15 between Tremonton and Ogden and ending at Interstate 80 at Echo.

Route description

Western segment

I-84 crosses the Idaho-Utah border approximately 7 miles (11 km) from Snowville, Utah, in the Curlew Valley, located in northern Box Elder County. The road heads in a generally southeasterly direction, intersecting SR-30 which provides access to the far northwestern corner of Utah, before crossing Deep Creek and passing through Snowville. I-84 passes just north of the Hansel Mountains before crossing the North Promontory Mountains and dropping into the Blue Creek Valley and the town of Howell. I-84 intersects two more local roads before crossing West Canal, and entering Tremonton. SR-102 intersects I-84 before an interchange with I-15, becoming concurrent with I-15.

Concurrency with I-15

I-15/I-84 continues southward, paralleling Union Pacific Railroad (UP) lines on the east as well as the Wellville Mountain Wilderness, and approaching an interchange with US-91 which provides access to Logan. After Logan, I-84 borders the Weber-Box Elder Canal and Wasatch-Cache National Forrest on the east, and on the west the Willard Bay Reservoir before exiting the county, and entering Weber County. I-84 enters Weber County , where the UP lines split from I-15/I-84 in Pleasant View, and continues southward towards the Ogden Municipal Airport and its split from I-15 near Roy.

Eastern segment

Splitting from I-15 near Roy, I-84 enters Weber County before briefly entering Davis County, and returning to Weber County. It passes by Hill Air Force Base as it starts to follow the Weber River into Morgan County and the Wasatch-Cache National Forest. Visible in Weber Canyon is Devil's Slide, an unusual rock formation just off the freeway. Entering Summit County, farther up the canyon is the Thousand Mile Tree, planted by Union Pacific Railroad workers to mark 1,000 miles (1,600 km) from the railroad's origin in Omaha, Nebraska. The freeway ends at Echo, a near ghost town that before served as a stopover for the railroad, at a junction with I-80. Also south of the I-80 junction is Echo Reservoir and Echo Dam.

History

The Thousand Mile Tree in Weber Canyon, as seen from I-84

Interstate 84 in Utah replaced the former route of U.S. Route 30S. The highway loosely follows the path of the Oregon Trail and the First Transcontinental Railroad

• 30S was one of the original routes in '26.
• I-80N renamed.
• Legislative designaion was SR-3.
  • Deleted May 20, 1977
• AASHTO approved name change from 80N > 84 on July 7, 1977

Exit list

County	Location	Mile	#	Destinations	Notes
Box Elder		4.660	5	SR-30 west – Park Valley, Elko	West end of SR-30 overlap
	Snowville	7.125	7	Snowville
		11.978	12	Ranch Exit
		15.808	16	Ranch Exit
		17.385	17	Ranch Exit
		20.317	20	Blue Creek
		24.457	24	Valley
	Howell	26.567	26	SR-83 south – Howell, Atk
		32.414	32	Ranch Exit
		39.508	39	Garland, Bothwell
	Bothwell Junction	40.824	40	SR-102 – Tremonton, Bothwell
		42.012	41	I-15 north (SR-30 east) – Pocatello	West end of I-15 overlap; east end of SR-30 overlap; no exit number westbound
See Interstate 15 (exits 379 to 340)
Weber	Riverdale	81.043		I-15 south – Salt Lake City	East end of I-15 overlap; westbound exit is via exit 81
		81.727	81	SR-26 – Riverdale
Weber	Uintah	84.594	85	Uintah, South Weber (Adams Avenue Parkway)
Davis	South Weber	87.771	87	US-89 – South Ogden, Salt Lake City, Ogden	Signed as exits 87A (north) and 87B (south) westbound
Morgan		92.339	92	SR-167 – Mountain Green, Huntsville	Westbound exit is via exit 96
		96.504	96	Stoddard, Peterson
	Morgan	103.333	103	SR-66 – Morgan
		106.173	106	Ranch Exit
		108.272	108	Taggart
		111.313	111	Croydon	Former SR-158
Summit		112.739	112	Henefer (SR-86)
	Henefer	115.399	115	Henefer, Echo (SR-65)
		119.773	120	I-80 west – Salt Lake	Eastbound exit and westbound entrance
		119.773		I-80 east – Cheyenne	Eastbound exit and westbound entrance

References

Interstate 84
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