Interstate 84 in Utah

Interstate 84 (I-84) is a part of the Interstate Highway System that links Portland, Oregon to I-80 near Echo, Utah. The 119.77-mile-long (192.75 km) segment in the U.S. state of Utah is the shortest of any of the three states the western portion of the Interstate Highway passes through, and contains the eastern terminus of the highway. I-84 enters Box Elder County near Snowville before becoming concurrent with I-15 in Tremonton. The concurrent highways travel south through Brigham City and Ogden and separate near the Ogden-Hinckley Airport. Turing east along the Davis County border, I-84 intersects U.S. Route 89 (US-89) and enters Weber Canyon as well as Morgan County. While in Morgan County, I-84 passes the Devil's Gate-Weber Hydroelectric Power Plant and Devil's Slide rock formation. Past Morgan, the highway crosses into Summit County, past the Thousand Mile Tree before reaching its eastern terminus at I-80 near Echo.

Construction of the controlled-access highway was scheduled in late 1957 under the designations Interstate 82S and Interstate 80N. The I-82S designation was only applied on paper for about a year, but the I-80N designation was the highway's official designation until 1977 when it was renumbered I-84 by the American Association of State Highway and Transportation Officials. By 1978, construction of the freeway had been completed across Utah, as well as Oregon and most of Idaho. I-84 is unusual as there are two noncontiguous segments: Oregon, Idaho, and Utah as well as Pennsylvania, New York, Connecticut, and Massachusetts. Average traffic in 2012, along the non-concurrent parts of I-84, ranged from as few as 6,655 vehicles traveling along I-84 at the interchange with SR-86 in Henefer, and as many as 18,945 vehicles used the highway at the SR-26 interchange in Riverdale.

Interstate 80N

Interstate 80N may refer to:

Interstate 84 (Oregon–Utah)

Interstate 84 (I-84) is an Interstate Highway with two non-contiguous sections. This western section runs from Portland, Oregon, to a junction with Interstate 80 near Echo, Utah. The sections running through Oregon and Idaho are also known as The Vietnam Veterans Memorial Highway. The highway originally served as a fork of I-80 to serve the Pacific Northwest, and was originally numbered Interstate 80N.

The highway serves and connects Portland, Oregon and Boise, Idaho with Ogden, Utah. Seattle, Washington is indirectly served by I-84 via a connection with Interstate 82. With the connection to I-80, I-84 connects these cities to points east.

I-80N was generally built along the corridor of U.S. Route 30 and U.S. Route 30S, which themselves largely followed the Oregon Trail; the U.S. Route 30S designation was decommissioned in the 1970s after the freeway replacement was mostly complete. The highway was signed with the I-84 designation in 1980, when a 1977 change in guidelines took effect that discouraged highway numbers with directional suffixes. The renumbering resulted in two highways being numbered I-84, with the other located in the Northeastern United States.

Interstate 84 in Oregon

Interstate 84 (I-84) in the U.S. state of Oregon, also known as the Vietnam Veterans Memorial Highway, travels east–west, following the Columbia River and the rough path of the old Oregon Trail from Portland east to Idaho. For this reason, it is also known as most of the Columbia River Highway No. 2 and all of the Old Oregon Trail Highway No. 6 (see Oregon highways and routes). It also follows along or near U.S. Route 30. The entire highway carried the designation I-80N (or I-80 North) until 1980, when this was changed to I-84.

Route description

Interstate 84 begins in Portland, Oregon where it connects with Interstate 5 on the east side of the Willamette River. It continues east, crossing Interstate 205, before curving to the north to join the Columbia River. It continues along the river, passing Interstate 82 in Hermiston, and US 395 in Pendleton. It then curves to the south, until it gets to the Idaho border. It continues into Idaho.

The Cabbage Hill grade east of Pendleton is a 6% grade, with several hairpin curves in both directions and a separation between directions of almost 2 miles (3 km).