List of Interstate Highways in Oregon

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Interstate Highways of the Oregon Highway System
x70pxInterstate 205 marker
Highway markers for Interstate 84 and Interstate 205
System information
Maintained by ODOT
Formed: June 29, 1956 (1956-06-29)[1]
Highway names
Interstates: Interstate nn (I‑nn)
System links

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 113 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]

Primary Interstate Highways

Number Length (mi)[7] 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 1957 current
x25px I-80N 375.17 603.78 I-5 / US 30 in Portland I-80N at the Idaho state line 1957 1980 Renumbered to I-84
I-82 11.01 17.72 I‑82 at the Washington state line I-84 / US 30 in Umatilla County 1957 current
I-84 375.17 603.78 I-5 / US 30 in Portland I-84 at the Idaho state line 1980 current
  •       Former

Auxiliary Interstate Highways

Number Length (mi)[8] 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 c. 1957 current
I-205 26.07 41.96 I-5 in Tualatin I‑205 at the Washington state line c. 1975 current
I-305 — — Salem I-5 in Salem 1950 1960
I-405 3.53 5.68 I-5 in Portland I‑5 / US 30 in Portland c. 1969 current
I-505 — — US 30 in Portland I-405 / US 30 in Portland 1950 1970
  •       Future

References

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  1. ↑ McNichol (2006), p. 106.
  2. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ McNichol (2006), pp. 10–11.
  5. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ McNichol (2006), pp. 57, 121.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

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