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Interstate 210, I -210 or State Route 210 is an Interstate Highway in the US state of California. The highway is made up of 2 sections, I-210 and SR-210 that together form the Foothill Freeway, an east-west route along the north side of the Los Angeles metropolitan area. The highway cuts through the more sparsely populated northern residential areas of Los Angeles, a row of suburbs at the base of the San Gabriel Mountains, and several fast-growing suburbs in the Inland Empire, the eastern metropolitan area. The stretch around San Bernardino was previously signposted as State Route 30. The highway is 138 kilometers long.
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I-210 at I-605 at Duarte.
The Gold Line overpass over I-210 in Arcadia.
The highway begins at the interchange with Interstate 5, the Golden State Freeway, in the Sylmar neighborhood of Los Angeles, located about 50 miles north of downtown. The highway follows a southeasterly course in this area, past San Fernando, and close to the uninhabited San Gabriel Mountains, which rise to more than 3000 meters. South of the highway are the large residential areas, north of the highway are still a few blocks, but otherwise mountainous area, so this part of I-210 is fairly quiet. The Ronald Reagan Freeway ends at the Pacoima neighborhoodon I-210, which comes out of Simi Valley. Near the Sunland neighborhood, I-210 runs through the Verdugo Mountains, and there are no exits here, as there are no residential areas in this stretch. The Verdugo Mountains are surrounded on all sides by residential areas of Los Angeles, Burbank and Glendale.
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After the Verdugo Mountains you come to the suburb of Glendale, which has 207,000 inhabitants. At La Canada Flintridge, the Glendale Freeway turns south into downtown Los Angeles. After this you reach the suburb of Pasadena, which has 146,000 inhabitants. At the center of Pasadena, at the interchange with the Ventura Freeway, I-210 exits east. Straight south, State Route 710 ends almost directly in Pasadena. That’s a missing link to the south. The Ventura Freeway runs west to Glendale and Ventura. This is where the busiest part of I-210 begins, and has 2×6 lanes.
After Pasadena, the long drive through the endless row of suburbs along the San Gabriel Mountains begins. Interstate 605 ends at Duarte, the San Gabriel River Freeway, which leads to El Monte, Norwalk, and Long Beach. The highway then runs through mainly residential areas of various medium-sized suburbs, with the occasional small business park. Just a few miles to the south, Interstate 10, the San Bernardino Freeway, runs more or less parallel to 210 for the remainder of its route, some distance away. Despite its proximity to I-10, I-210 is very busy because so many people live on it. The Orange Freeway ends at San Dimason I-210. From here you can go south to Pomona, Anaheim, Orange and Santa Ana. This area is more or less the transition between the old Los Angeles and suburbs to the new fast-growing suburbs of the so-called Inland Empire, a large metropolitan area around Riverside and San Bernardino, which now has millions of inhabitants.
State Route 210
After the junction with the SR-57 (Orange Freeway), the road number changes to State Route 210. Because the last part in Rialto was opened in 2007, it is expected that the rest of the route will be renumbered to Interstate 210. Between Claremont and Upland crosses the county line between Los Angeles County and San Bernardino County. People are now entering the so-called “boomburbs”, fast-growing suburbs. The first is Rancho Cucamonga, which in 1980 had about 55,000 inhabitants, but in 2006 already has more than 170,000 inhabitants. This massive growth puts a heavy burden on the already congested highways to Los Angeles. Through Rancho Cucamonga, the highway has 2×5 lanes. On the east side of Rancho Cucamonga, one crosses Interstate 15, which runs from San Diego to Las Vegas. Here a lot of business and leisure traffic turns to Las Vegas.
The next Boomburb is Fontana, which grew from 129,000 to 184,000 inhabitants in 7 years. After this you arrive in Rialto, which has 102,000 inhabitants. This route was recently opened (2007). After Rialto one enters one of the most important cities of the Inland Empire; San Bernardino, which has 205,000 inhabitants. This city had been quite large for some time, but is quickly being overtaken by previously virtually unknown suburbs. One crosses Interstate 215, which forms a north-south connection in the east of the urban area. The SR-210 forms a bypass of San Bernardino here. Roads turn off at Highland and lead to the winter sports resorts of the San Bernardino Mountains. Despite the Mediterranean climate of the agglomeration, winter sports and snow nuisance are possible here. For the last part, SR-210 heads south, through Redlands, to eventually end up on Interstate 10 after 138 kilometers from the city.
I-210 was built a little later than most other highways in the region. In 1968 the first part opened in Arcadia and Monrovia. This was extended east to Azusa in the late 1960s and in 1969 the first part opened in Los Angeles, namely in the San Fernando Valley. In particular, the part through La Crescenta was delayed, and here a more difficult route through the mountains was eventually chosen. Another part that was continuously delayed was the part through Pasadena, also the most important part because Pasadena is the largest city along the I-210 with a downtown function. I-210, then numbered State Route 30, was built through eastern San Bernardino in the 1980s and 1990s.
The highway ended for a long time, there was a missing link between La Verne and San Bernardino. Because two east-west highways were already located here (I-10 and SR-60), they were given little priority, and the 1980s and 1990s saw virtually no expansion of the Los Angeles area’s freeway network. Ultimately, the growth of the Inland Empire did not stop, and people were still forced to complete I-210, especially due to the growth of suburbs such as Rancho Cucamonga, Fontana and Rialto. The last section of I-210 opened in 2007, nearly 40 years later than originally planned.
|Santa Anita Avenue||I-605||6 km||25-09-1968|
|I-605||Azusa Avec||5 km||00-02-1969|
|Azusa Avec||Grand Avenue||3 km||00-11-1969|
|Roxford Sto||Maclay St||5 km||12-12-1969|
|I-5||Roxford Sto||3 km||14-10-1970|
|Grand Avenue||Foothill Blvd||9 km||28-01-1971|
|Michillinda Avenue||Santa Anita Avenue||3 km||06-07-1971|
|H Street||Arden Avenue||6 km||28-10-1971|
|Arroyo Blvd||Orange Grove Blvd||4 km||06-04-1973|
|Lowell Avenue||Linda Vista Avenue||10 km||19-06-1973|
|Linda Vista Avenue||Arroyo Blvd||1 km||29-08-1974|
|Orange Grove Blvd||I-710/SR-134||0.5 km||28-02-1975|
|Maclay St||Van Nuys Blvd||4 km||25-08-1975|
|La Tuna Canyon Road||Lowell Avenue||2 km||16-10-1975|
|I-710/SR-134||Michillinda Avenue||8 km||19-02-1976|
|Sunland Blvd||La Tuna Canyon Road||5 km||08-11-1977|
|Wheatland Avenue||Sunland Blvd||3 km||14-10-1980|
|Van Nuys Blvd||Wheatland Avenue||5 km||21-01-1981|
|Highland Avenue||H Street||4 km||30-07-1989|
|5th Street||I-10||5 km||31-03-1993|
|Arden Avenue||5th Street||5 km||01-07-1993|
|Milliken Avenue||Sierra Avenue||11 km||20-08-2001|
|Foothill Blvd||Milliken Avenue||21 km||24-11-2002|
|Sierra Avenue||Highland Avenue||9 km||24-07-2007|
A six-mile section of I-210 will be widened to 2×3 lanes from Sterling Avenue to San Bernardino Avenue.   Work started on 26 February 2020 and should be completed by early 2023.
See also Los Angeles HOV system.
Part of I-210 has HOV lanes, along a long continuous stretch from the Ventura Freeway in Pasadena to I-215 in San Bernardino. This stretch is almost 80 kilometers long, making it one of the longest continuous HOV facilities in the country.
The first section of the HOV lanes opened on December 16, 1993 from the Ventura Freeway in Pasadena to Sunflower Avenue in Glendora, just before the interchange with SR-57. On November 24, 2002, these were extended into San Bernardino County to Fontana. The section between Fontana and San Bernardino opened to traffic on July 24, 2007. The HOV facilities in San Bernardino County were created immediately with the construction of I-210/SR-210.
Since 2013, the HOV lanes on Interstate 210 between Pasadena and Glendora may also be used by solo drivers outside rush hour, because few people carpool outside rush hour, the residual capacity is significant.
|Exit 1||Los Angeles ( I-5 )||79,000||76,000||84,000|
|exit 6||Los Angeles ( SR-118 )||129,000|
|Exit 19||Glendale ( SR-2 )||168,000||166,000||186,000|
|Exit 25||Pasadena ( SR-134 )||298,000||294,000||329.000|
|exit 36||Duarte ( I-605 )||258,000||263,000||269,000|
|exit 45||San Dimas ( SR-57 )||247,000||242,000||257,000|
|Exit 64||Fontana ( I-15 )||148,000||156,000||174,000|
|Exit 74||San Bernardino ( I-215 )||30,000||30,000||104,000|
|Exit 76||San Bernardino||114,000||–||107,000|
|exit 85||Redlands ( I-10 )||75,000||–||80,000|
Because I-210 runs more along the edge of the Los Angeles metropolitan area, it is not as busy as other east-west freeways such as I-10 and Pomona Freeway. This is also because it is not easy to drive from the I-210 towards downtown Los Angeles, as the I-710 through Pasadena is still missing. The highway is therefore especially interesting for traffic to and from the regional center Pasadena. The section through Pasadena is therefore the busiest stretch of I-210 with structural congestion. The part through the San Fernando Valley and east of Azusa is less crowded. The part through San Bernardino is also not extremely busy.