Interstate 580 is the designation for two tertiary interstate highway routes, spurring from Interstate 80.

Interstate 580 was also the designation for a 4-mile spur route in northern Omaha in the late 1970s and early 1980s. This designation was revoked when the state of Nebraska declined to upgrade the interchange with I-480 to Interstate standards. The freeway is currently the route of U.S. Highway 75.

California

Interstate 580 (MacArthur Freeway) in northern California is a heavily traveled, fairly long spur route of Interstate 80 that connects the San Francisco Bay Area to Interstate 5 in the central valleys of the state. The western terminus of I-580 is north of San Francisco in San Rafael, at a junction with U.S. Highway 101. The eastern terminus is with I-5 southeast of Tracy. It was named after General Douglas MacArthur in 1968. Leaving San Rafael, I-580 runs next to the San Quentin State Prison before crossing San Francisco Bay over the Richmond-San Rafael Bridge.

Major cities

• San Rafael
• Richmond
• Albany
• Berkeley
• Emeryville
• Oakland
• San Leandro
• Dublin
• Pleasanton
• Livermore
• Tracy

Intersections with other Interstates

• Joins Interstate 80 in Albany
• Separates from I-80 in Emeryville (junction is also the north terminus of Interstate 880)
• Interstate 980 (northern terminus of I-980) in Oakland
• Interstate 238 (eastern terminus of I-238) in Castro Valley
• Interstate 680 in Pleasanton
• Interstate 205 (western terminus of I-205) between Livermore and Tracy
• Interstate 5 southeast of Tracy

Notes

On the section of 10-lane freeway that is designated both I-80 and I-580, from Emeryville to Albany, the two routes are running in opposite directions. That is, while a vehicle is physically moving north on the road, it is on both I-80 East and I-580 West.

Nevada

Interstate 580 in Nevada is a planned interstate route between Reno and Carson City that is still under construction. I-580 has been part of the Interstate planning in Nevada since the 1950s but has never been completed. Much of the future I-580 will be co-signed with the current U.S. Highway 395 freeway in Reno but will not travel north of Interstate 80. I-580 is slated to be completed in 2008.

See also: Interstate 80