Traveling southwest through the four-level interchange linking SR 24, I-580 (MacArthur Freeway) and I-980 (Grove Shafter Freeway) in Oakland. 07/18/09
Interstate 980 is an urban freeway connecting I-880 (Nimitz Freeway) with California State Route 24 (Grove Shafter Freeway) in the city of Oakland. I-980 forms the western leg of a major commuter route joining the East Bay communities of Walnut Creek and Concord with Downtown Oakland and Oakland International Airport (OAK).
Sign replacements made in 2016 added exit numbers to eastbound off-ramps. Confirming markers along Interstate 980 were installed by 2011.
The one mile section of I-980 between I-580 and 21st Street was constructed as part of Federal-aid Projects I-580-1(148)1 and U-039-1(10). The controlled access roadway was built to Interstate standards except for shoulder widths, which were eight feet wide on elevated structures. The Federal Highway Administration (FHWA) allowed the minor exception and accepted the route into the Interstate system on January 29, 1976. The remaining 0.8 mile segment southwest to SR 17 (I-880) was also approved under the provisions of 23 USC 103(e)(1).1
FHWA tentatively assigned Interstate 180 for the route, subject to concurrence of the American Association of State Highway and Transportation Officials (AASHTO). However it was determined that 980 should be used instead, due to conflicts with California State Route 180 across the Central Valley. Numbering the route I-980 was subsequently discussed with the FHWA, resulting in their concurrence. Interstate 980 was formally approved by AASHTO on July 12, 1976.1
Interstate 980 was added to the Interstate Highway System to secure federal funding. Otherwise it was slated to become part of an extended freeway for SR 24. A 0.80 mile section of the route was initially approved as an addition to the California Interstate Highway System mileage in 1976. The Interstate was designated by the Federal Highway Administration (FHWA) in 1983 and added to the California State Highway System in 1984. A ribbon cutting ceremony marked the completion of Interstate 980 on March 6, 1985.2