Interstate 84 (I-84) is an Interstate Highway in the northwestern United States. The highway runs from Portland, Oregon, to a junction with I-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, Boise, and Ogden. Salt Lake City is indirectly served by I-84 via a connection with I-15 in Ogden. Seattle, Washington is also indirectly served by I-84 via a connection with I-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 (US 30) and US 30S, which themselves largely followed the Oregon Trail; the US 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.
