List of Interstate Highways in Oregon

Interstate Highways of the Oregon Highway System
	Highway markers for Interstates in Oregon
System information
	Maintained by ODOT
Formed	June 29, 1956[1]
Highway names
Interstates	Interstate nn (I‑nn)
System links
	Oregon Highways; Interstate; US; State Named; ; Scenic;

The Interstate Highways in Oregon are the segments of the national Dwight D. Eisenhower System of Interstate and Defense Highways[2] that are owned and maintained by the U.S. state of Oregon. On a national level, the standards and numbering for the system are handled by the Federal Highway Administration (FHWA) and the American Association of State Highway and Transportation Officials (AASHTO), while the highways in Oregon are maintained by the Oregon Department of Transportation (ODOT).

These highways are built to Interstate Highway standards,[3] meaning they are all freeways with minimum requirements for full control of access, design speeds of 50 to 70 miles per hour (80 to 115 km/h) depending on type of terrain, a minimum of two travel lanes in each direction, and specific widths of lanes or shoulders;[4] exceptions from these standards have to be approved by the FHWA.[5] The numbering scheme used to designate the Interstates was developed by AASHTO, an organization composed of the various state departments of transportation in the United States.[6]

The last section of the Interstate Highway system to be built in Oregon, on I-82 near Hermiston, opened on September 20, 1988.[7]

Primary Interstate Highways

Number	Length (mi)[8]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed	Notes
I-5	308.14	495.90	I-5 at the California state line	I-5 at the Washington state line	01957-01-011957	current
I-80N	375.17	603.78	I-5 / US 30 in Portland	I-80N at the Idaho state line	01957-01-011957	01980-01-011980	Renumbered to I-84
I-82	11.01	17.72	I-82 at the Washington state line	I-84 / US 30 in Umatilla County	01957-01-011957	current
I-84	375.17	603.78	I-5 / US 30 in Portland	I-84 at the Idaho state line	01980-01-011980	current
Former

Auxiliary Interstate Highways

Number	Length (mi)[9]	Length (km)	Southern or western terminus	Northern or eastern terminus	Formed	Removed
I-105	3.49	5.62	OR 99 / OR 126 / OR 126 Bus. in Eugene	I-5 / OR 126 in Springfield	01957-01-01c. 1957	current
I-205	26.07	41.96	I-5 in Tualatin	I-205 at the Washington state line	01975-01-01c. 1975	current
I-305	—	—	Salem	I-5 in Salem	01950-01-011950	01960-06-241960
I-405	3.53	5.68	I-5 in Portland	I-5 / US 30 in Portland	01969-01-01c. 1969	current
I-505	—	—	US 30 in Portland	I-405 / US 30 in Portland	01950-01-011950	01970-01-011970
Future

References

McNichol, Dan (2006). The Roads that Built America. New York: Sterling. ISBN 1-4027-3468-9.CS1 maint: ref=harv (link)
Kramer, George. "Interstate 50th Anniversary: The Story of Oregon's Interstates" (PDF). Compiled by Oregon Department of Transportation. Oregon Department of Transportation. Archived from the original (PDF) on December 15, 2006. Retrieved August 31, 2016.
Staff (May 2004). "The Interstate Highway System in Oregon: A Historic Overview" (PDF). Oregon Department of Transportation.

McNichol (2006), p. 106.
Swift, Earl (2011). The Big Roads: The Untold Story of the Engineers, Visionaries, and Trailblazers Who Created the American Superhighways. Boston: Mariner. p. 5. ISBN 978-0-547-90724-6.
Lewis, Tom (2013). Divided Highways: Building the Interstate Highways, Transforming American Life (Updated ed.). Ithaca, NY: Cornell University Press. p. 253. ISBN 978-0-8014-7822-2.
McNichol (2006), pp. 10–11.
Zander, Mark, ed. (September 19, 2013). "Chapter 11: Design, Section 44: Interstate Highways" (PDF). Facilities Development Manual. Wisconsin Department of Transportation. p. 2. Archived from the original (PDF) on April 16, 2014. Retrieved April 14, 2014.
McNichol (2006), pp. 57, 121.
Cockle, Dick (September 21, 1988). "Final segment completes freeway system". The Oregonian. p. B4.
Adderly, Kevin (January 27, 2016). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved August 31, 2016.
Adderly, Kevin (January 27, 2016). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved August 31, 2016.

External links

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[mcnichol106-1] McNichol (2006), p. 106.

[2] Swift, Earl (2011). The Big Roads: The Untold Story of the Engineers, Visionaries, and Trailblazers Who Created the American Superhighways. Boston: Mariner. p. 5. ISBN 978-0-547-90724-6.

[3] Lewis, Tom (2013). Divided Highways: Building the Interstate Highways, Transforming American Life (Updated ed.). Ithaca, NY: Cornell University Press. p. 253. ISBN 978-0-8014-7822-2.

[4] McNichol (2006), pp. 10–11.

[5] Zander, Mark, ed. (September 19, 2013). "Chapter 11: Design, Section 44: Interstate Highways" (PDF). Facilities Development Manual. Wisconsin Department of Transportation. p. 2. Archived from the original (PDF) on April 16, 2014. Retrieved April 14, 2014.

[6] McNichol (2006), pp. 57, 121.

[7] Cockle, Dick (September 21, 1988). "Final segment completes freeway system". The Oregonian. p. B4.

[USDOT_primary-8] Adderly, Kevin (January 27, 2016). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved August 31, 2016.

[USDOT_auxiliary-9] Adderly, Kevin (January 27, 2016). "Table 2: Auxiliary Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2015". Route Log and Finder List. Federal Highway Administration. Retrieved August 31, 2016.