Interstate 210 (California)

Interstate 210 (California) is a major east–west auxiliary Interstate Highway in the Greater Los Angeles area of Southern California. It serves as a critical bypass route north of downtown Los Angeles, connecting the San Fernando Valley with the San Gabriel Valley and the Inland Empire. The freeway is officially designated as the San Bernardino Freeway along its western segment and the Foothill Freeway for the majority of its length, providing a vital transportation link through numerous communities in Los Angeles County and San Bernardino County.

Route description

Beginning at its western terminus at Interstate 5 in the Sylmar district of Los Angeles, the freeway heads east through the northern foothills of the San Gabriel Mountains. It passes through or near the cities of La Cañada Flintridge, Pasadena, Arcadia, and Azusa, skirting the southern edge of the Angeles National Forest. The route intersects key highways including State Route 2 in Glendale and Interstate 605 near Irwindale. East of San Dimas, it crosses into San Bernardino County, continuing through Rancho Cucamonga and Fontana before terminating at Interstate 10 in Redlands. The corridor provides essential access to major institutions like the Jet Propulsion Laboratory and the Santa Anita Park racetrack.

History

The route's origins lie in the state highway system, with portions constructed as the Foothill Freeway beginning in the 1960s. It was incorporated into the Interstate Highway System as a relocation of Interstate 210, taking over the designation from a segment of the former Route 30. Significant construction milestones included the completion of the Tunnel Station segment through La Cañada Flintridge in the 1970s and the critical connection across the Los Angeles County line in the 1980s. The final segment, linking Fontana to Redlands, opened to traffic in 2007, completing the continuous freeway. This completion was a key project of the San Bernardino Associated Governments.

Future

Planned improvements focus on increasing capacity and managing traffic flow along this heavily traveled corridor. The San Bernardino County Transportation Authority has studied potential high-occupancy vehicle lane extensions and interchange modernizations, particularly at the confluence with Interstate 15 in Fontana. Long-range plans from the Southern California Association of Governments consider the route part of a broader strategy to improve connectivity between the Inland Empire and Los Angeles County. There are also ongoing discussions regarding improved transit integration and seismic retrofitting of older structures, in coordination with Caltrans District 7 and District 8.

Exit list

The exit numbering sequence runs consecutively from west to east. Major interchanges include exit 1B for Interstate 5 in Sylmar, exit 11 for State Route 2 in Glendale, and exit 25 for Interstate 605 near Irwindale. In San Bernardino County, key exits include exit 50 for Historic Route 66 in Rancho Cucamonga, exit 68 for Interstate 15, and the eastern terminus at exit 81 for Interstate 10 in Redlands. The list includes junctions providing access to Pasadena City College, the Ontario International Airport, and the University of Redlands.

Junction list

The following is a summary of major highway intersections along the route, from west to east. * Interstate 5 in Sylmar, Los Angeles * State Route 118 in Sylmar, Los Angeles * State Route 2 in Glendale, California * Interstate 605 at the Los Angeles County/San Bernardino County line near Irwindale, California * State Route 57 in Glendora, California * Interstate 15 in Fontana, California * State Route 259 in San Bernardino, California * Interstate 10 in Redlands, California

Category:Interstate Highways in California Category:Transportation in Los Angeles County, California Category:Transportation in San Bernardino County, California