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

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 through to the merge with Interstate 15 at Tremonton.

I-84 shares 35.98 miles of pavement with Interstate 15 southward across Bear River Valley to Brigham City and Ogden. Southeast from I-15, Interstate 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 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 Utah 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

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 Utah Highway Guides

Interstate 84 Scenes
Southward view from the Utah 65 (Main Street) overpass at Henefer. Photo taken 09/08/05.
Main Street west at the Interstate 84 westbound on-ramp at Henefer. Note the small freeway entrance sign. These are found throughout California and Nevada with highway shields. UDOT however posts the freeway entrance signs solo. Photo taken 09/08/05.
Utah 65 begins and follows Main Street west across Interstate 84 into Henefer. Pictured here is an eastbound shield for the on-ramp to Echo and junction Interstate 80. Photo taken 09/08/05.
Interstate 84 ends five miles to the south of Utah 65 and Henefer at Interstate 80. Photo taken 09/08/05.
An end shield for Utah 65 was formerly posted at the Union Pacific Railroad under crossing adjacent to Interstate 84. It was removed by 2013. Photo taken 09/08/05.


  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:

09/08/05 by AARoads

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

Page Updated 06-30-2016.