Columbia River Highway No. 2

Interstate 84
Route information
Maintained by ODOT
Length:	375.68 mi (604.60 km)
Existed:	1957 – present
Major junctions
West end:	I-5 in Portland
	US 30 in Portland I-205 in Portland US 197 in The Dalles US 97 in Biggs Junction US 730 near Boardman I-82 near Hermiston US 395 from Stanfield to Pendleton US 30 in Ontario
East end:	I-84 at Idaho state line
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Oregon Highways Interstate US State Named Scenic ← OR 82 OR 86 →

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 Interstate 80N (I-80N, or Interstate 80 North) until 1980, when this was changed to I-84.

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 U.S. Route 395 in Pendleton. It then curves to the south, until it gets to the Idaho border. It continues into Idaho.

...
Wikipedia