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Interstate 205 Business (California)

Interstate 205 marker

Interstate 205
Robert T. Monagan Freeway
Route information
Defined by
Maintained by Caltrans
Length: 12.973 mi (20.878 km)
Existed: Dec 1970 – present
History: State highway in 1910
Major junctions
West end: I-580 near Tracy
East end: I-5 near Manteca
Highway system
SR 204 SR 207

Interstate 205 Business
Location: Tracy, California

Interstate 205 marker

Interstate 205 (abbreviated I-205) is a short auxiliary Interstate Highway that connects Interstate 5 with Interstate 580 in the San Joaquin Valley in the U.S. state of California. Along with those highways, I-205 forms the north side of a triangle around the city of Tracy. The route provides access from the San Francisco Bay Area to the northern San Joaquin Valley. It is officially designated as the Robert T. Monagan Freeway after the California legislator who represented the area from 1961 to 1973.

When I-205 opened in December 1970, it replaced 11th Street, which passed through downtown Tracy, as part of the primary all-land connection between the Bay Area and Sacramento until the Carquinez Bridge opened in 1927, and carried the Lincoln Highway and later U.S. Route 50. 11th Street is now signed as Interstate 205 Business.

Interstate 205 begins at the bottom of I-580's eight-lane descent from Altamont Pass into the San Joaquin Valley. Here I-580 turns southeast to a junction with I-5, paralleling the California Aqueduct and Delta-Mendota Canal along the foothills, while I-205 continues east as a six-lane roadway, immediately crossing both waterways. The first interchange is with Mountain House Parkway, formerly Patterson Pass Road, which serves the planned community of Mountain House. Next is a split with Business 205, a business loop that follows 11th Street through Tracy. As I-205 curves east-northeast and back east through the northern part of Tracy, it has interchanges with Grant Line Road (County Route J4 towards Antioch), Tracy Boulevard (County Route J13 through downtown Tracy), and MacArthur Drive. After several miles without an interchange, the highway ends at a merge with I-5, where traffic can continue northeast to the junction with SR 120 near Manteca and then east on SR 120 towards Yosemite National Park or north on I-5 towards .


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