Interstate 84

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I-84 west - Morgan Valley, UT

Interstate 84 travels through Morgan Valley northwest from the city of Morgan to Mountain Green and the Wasatch Range. 07/05/16

Interstate 84 enters the state from Idaho at Curlew Valley in Box Elder County. Traveling eastward, the freeway runs between the Hansel and North Hansel Mountains to Rattlesnake Pass and Blue Creek Valley. The rural route encircles the Point Lookout Mountains to the overlap with Interstate 15 at Tremonton.

Interstate 84 Utah Guides

I-84 shares a 35.98 mile concurrency with Interstate 15 southward across Bear River Valley to Brigham City and Ogden. Southeast from I-15, I-84 crosses the Wasatch Range through Weber Canyon, Morgan Valley, Upper Weber Canyon and Henefer Valley to end at Interstate 80 and Echo Junction.

The Portland, Oregon to Echo, Utah freeway was designated as Interstate 80N until 1977, when the American Association State Highway Transportation Officials (AASHTO) approved the renumbering to Interstate 84 as part of transportation officials efforts to eliminate suffixed Interstate routes. Sign changes were finalized by July 1, 1980.1

Initial segments of the route in Utah opened by 1969 included the 4.1 mile portion from the Idaho state line to SR 30 near Snowville, a 4.3 mile stretch leading to and from Rattlesnake Pass, and the easternmost seven miles from Henefer to Echo Junction. Another 16.8 miles of I-80N was under construction in 1969 both west of Tremonton and east of Ogden.2

Northern Utah - 1971

Northern Utah - 1971. Interstate 80N directly replaced or paralleled U.S. 30S as it was constructed from Snowville southeast to Echo.

SR 65 at I-84 - Henefer, UT

Looking northwest at Interstate 84 from the SR 65 (Main Street) over crossing at Exit 115. 09/08/05

Interstate 80N was complete across Utah by 1974 with the exception of a 9.8 mile link between Blue Creek Summit and Tremonton in Box Elder County. That section was scheduled for 1983,3 but work on the three year project did not commence until 1983. The $21 million project finally opened to traffic following a dedication ceremony held on September 25, 1986.4

Interstate 84 scenes
SR 79 (31st Street) west at the diamond interchange (Exit 341) with I-15/84 in the city of Ogden. This exchange was formerly a cloverleaf. 08/01/16
SR 66 (State Street) constitutes a 14.35 mile long highway north from SR 65 at East Canyon Reservoir to Porterville and Interstate 84 in the city of Morgan. 07/16/17
A service road runs alongside Interstate 84 east from SR 66 at State Street to the entrance ramp from the north end of SR 66 between 500 East and 600 East in Morgan. 07/16/17

  1. "Road numbers to change." The Spokesman-Review, November 3, 1977.
  2. "105 Miles Planned For Utah's Interstate." The Deseret News, January 11, 1969.
  3. "Rough going for interstate." The Deseret News, May 16, 1974.
  4. "Officials dedicate the final stretch of I-84." The Deseret News, September 26, 1986.

Photo Credits:

08/01/16, 07/16/17 by AARoads

Connect with:
Interstate 15
Interstate 80
U.S. 89
U.S. 91

Page Updated 02-15-2022.

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