Interstate Highways of the Oregon Highway System | |
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Highway markers for Interstates in Oregon | |
Interstate Highways highlighted in red | |
System information | |
Maintained by ODOT | |
Formed | June 29, 1956 [1] |
Highway names | |
Interstates | Interstate nn (I-nn) |
US Highways | U.S. Route nn (US nn) |
State | Oregon Route nn (OR nn) |
Named highways | xx Highway No. 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 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 Oregon state government initially proposed numbering the auxiliary Interstates using lettered suffixes, but were denied in 1958 by the American Association of State Highway Officials (forerunner to the AASHTO). [7] The last section of the Interstate Highway system to be built in Oregon, on I-82 near Hermiston, opened on September 20, 1988. [8]
Number | Length (mi) [9] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes | |
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![]() | 308.14 | 495.90 | I-5 at the California state line | I-5 at the Washington state line | 1957 | current | ||
![]() | 375.17 | 603.78 | I-5 / US 30 in Portland | I-80N at the Idaho state line | 1957 | 1980 | Renumbered to I-84 | |
![]() | 11.01 | 17.72 | I-82 at the Washington state line | I-84 / US 30 in Umatilla County | 1957 | current | ||
![]() | 375.17 | 603.78 | I-5 / US 30 in Portland | I-84 at the Idaho state line | 1980 | current | ||
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Number | Length (mi) [10] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | ||
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![]() | 3.49 | 5.62 | OR 99 / OR 126 / OR 126 Bus. in Eugene | I-5 / OR 126 in Springfield | 1957 | c.current | ||
![]() | 26.07 | 41.96 | I-5 in Tualatin | I-205 at the Washington state line | 1958 | current | ||
![]() | — | — | Salem | I-5 in Salem | 1957 | c.1967 | ||
![]() | 3.53 | 5.68 | I-5 in Portland | I-5 / US 30 in Portland | 1958 | current | ||
![]() | — | — | US 30 in Portland | I-405 / US 30 in Portland | 1957 | c.1988 | ||
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The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Highway System in the United States. The system extends throughout the contiguous United States and has routes in Hawaii, Alaska, and Puerto Rico.
Interstate 515 (I-515) was a 20.54-mile-long (33.06 km) spur route of I-15 in the US state of Nevada that ran from the junction of I-15, US 93 and US 95 in Downtown approximately 20 miles (32 km) southeast to just north of Railroad Pass in southeastern Henderson. The freeway connected traffic headed from Boulder City and Henderson to Downtown Las Vegas via a direct, high-speed route, and it ran concurrently with, US 93, and US 95 along its entire length.
Interstate 296 (I-296) is a part of the Interstate Highway System in the US state of Michigan. It is a north–south state trunkline highway that runs for 3.43 miles (5.52 km) entirely within the Grand Rapids area. Its termini are I-196 near downtown Grand Rapids and I-96 on the north side of Grand Rapids in Walker. For most of its length, the Interstate runs concurrently with U.S. Highway 131 (US 131), which continues as a freeway built to Interstate Highway standards north and south of the shorter I-296. The highway was first proposed in the late 1950s and opened in December 1962, but the Michigan Department of Transportation (MDOT) has since eliminated all signage for I-296 and removed the designation from their official state map. The designation is therefore unsigned, but still listed on the Interstate Highway System route log maintained by the Federal Highway Administration (FHWA).
Interstate 180 (I-180) is a 1.09-mile-long (1.75 km) expressway in the US state of Wyoming between I-80 and downtown Cheyenne.
The Falmouth Spur is a short freeway connecting Interstate 95 (I-95) with I-295 and US Route 1 (US 1) north of Portland, Maine, in the United States. It carries the unsigned designation of Interstate 495 (I-495). As part of the Maine Turnpike, the mainline of which carries I-95, the Falmouth Spur is a toll road. The spur has only two interchanges—one at each end—and a toll booth in the middle. It is signed only for its destinations—I-95, I-295, and US 1—to minimize driver confusion.
Interstate 190 (I-190) is an auxiliary Interstate Highway in the US state of South Dakota. The route runs for about two miles (3.2 km) connecting I-90 to downtown Rapid City. The entire route is concurrent with US Highway 16 (US 16). It is the westernmost auxiliary route of I-90 and its only auxiliary route west of the Mississippi River.
Interstate 41 (I-41) is a 175.00-mile-long (281.64 km) north–south Interstate Highway connecting the interchange of I-94 and U.S. Route 41 (US 41), located about a mile (1.6 km) south of the Wisconsin–Illinois border at the end of the Tri-State Tollway in metropolitan Chicago, to an interchange with I-43 in metropolitan Green Bay, Wisconsin. The designation travels concurrently with US 41 for its entire length, as well as portions of I-894, US 45, I-43, and sections of I-94 in Wisconsin and Illinois. The route was officially added to the Interstate Highway System on April 7, 2015, and connects Milwaukee and Green Bay with the Fox Cities.
Interstate 285 (I-285) is a 23.49 mile long auxiliary interstate highway connecting the cities of Lexington and Winston-Salem, in the U.S. state of North Carolina. The route was approved in February 2018 and was first signed in November 2018. An auxiliary route of I-85, it branches off of its parent route and runs northeast, bypassing central Lexington, before turning due north and heading toward Winston-Salem, terminating at an interchange with I-40. I-285 is cosigned with US Highway 52 (US 52) for its entire route, and as of November 2018, still uses US 52 milemarkers and exit numbers. Other routes cosigned along parts of the route include I-85 Business, US 29, US 70, and North Carolina Highway 8 (NC 8). I-285 has been approved for an extension along the US 52 freeway through Winston-Salem to meet the future Winston-Salem Northern Beltway.
Interstate 277 (I-277) is a 4.14-mile (6.66 km) auxiliary Interstate Highway connecting I-76 and I-77 in Akron, Ohio. It was completed in 1970 and shares its entire length with U.S. Route 224 (US 224).
Interstate 85 (I-85) is a part of the Interstate Highway System that runs from Montgomery, Alabama, to Petersburg, Virginia. In Alabama, the Interstate Highway runs 80 miles (130 km) from I-65 in Montgomery northeast to the Georgia state line near Valley. Although it is nominally north–south as it carries an odd number, I-85 travels east–west through the state. It is the primary highway between Montgomery and Atlanta. The Interstate also connects Montgomery with Tuskegee, Auburn, Opelika, and, indirectly, Phenix City and Columbus, Georgia.
Interstate 795 (I-795) is a 25.49-mile (41.02 km) auxiliary Interstate Highway in the US state of North Carolina. It connects the city of Goldsboro to I-95 just south of Wilson, paralleling the northern portion of US Route 117 (US 117). The road runs a five-mile (8.0 km) concurrency with US 264 and I-587 in the last section of the route. It serves as a primary freeway spur for the city of Goldsboro to the Interstate Highway System, as well part of a major cargo route for the cities of Down East, which was a part of the impetus for its designation in 2007. Future plans call for the interstate to be further extended southward to meet I-40 near Faison.
Interstate 87 (I-87) is a partially completed Interstate Highway in the US state of North Carolina, the shortest designated primary Interstate Highway at 12.90 miles (20.76 km) long. The completed portion is in eastern Wake County, between Raleigh and Wendell; the majority of the completed route is known as the Knightdale Bypass, while the remaining three miles (4.8 km) follows the Raleigh Beltline (I-440). It is planned to continue northeast through Rocky Mount, Williamston, and Elizabeth City, ending in Norfolk, Virginia. It is signed as north–south, in keeping with the sign convention for most odd-numbered interstates, but the route goes primarily east–west, with the eastern direction aligning to the north designation. The entire route is concurrent with US Highway 64 (US 64), with portions also concurrent with I-440 and US 264.
Interstate 587 (I-587) is a 37.07-mile (59.66 km) auxiliary Interstate Highway in the US state of North Carolina. The western terminus of the highway is at I-95, I-795, and US Highway 264 (US 264) near Wilson. The highway runs concurrently with I-795 and US 264 around the southern side of Wilson. I-795 diverges toward Goldsboro 4.4 miles (7.1 km) east of I-95. The eastern end of the US 264 overlap is located northwest of Saratoga. I-587 continues travelling east, bypassing Saratoga and Farmville to the north. The eastern terminus of I-587 is located at US 264 and North Carolina Highway 11 Bypass in western Greenville. I-587 is a spur of the North Carolina segment of I-87 which runs from Raleigh to Wendell. As of 2024, I-587 does not connect with its parent route.