Interstate 210 and State Route 210 (California)

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Interstate 210 markerState Route 210 marker

Interstate 210 and State Route 210
Foothill Freeway
Route information
Defined by S&HC § 510
Maintained by Caltrans
Length:86 mi[1] (138 km)
Length includes the unconstructed freeway section.
History:1933 as a highway, 1964 as a number
I-210 from Los Angeles to Glendora
SR 210 from Glendora to Redlands
Major junctions
West end: I-5 in Los Angeles
  SR 134 in Pasadena
I-605 in Irwindale
SR 57 in Glendora
I-15 in Rancho Cucamonga
I-215 in San Bernardino
East end: I-10 in Redlands
Highway system
SR 209SR 211
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Interstate 210 markerState Route 210 marker

Interstate 210 and State Route 210
Foothill Freeway
Route information
Defined by S&HC § 510
Maintained by Caltrans
Length:86 mi[1] (138 km)
Length includes the unconstructed freeway section.
History:1933 as a highway, 1964 as a number
I-210 from Los Angeles to Glendora
SR 210 from Glendora to Redlands
Major junctions
West end: I-5 in Los Angeles
  SR 134 in Pasadena
I-605 in Irwindale
SR 57 in Glendora
I-15 in Rancho Cucamonga
I-215 in San Bernardino
East end: I-10 in Redlands
Highway system
SR 209SR 211

Route 210, consisting of the contiguous segments of Interstate 210 (I-210) and State Route 210 (SR 210) forming the Foothill Freeway, is a major east—west state highway in the Greater Los Angeles area of the U.S. state of California. The western portion of the route is an auxiliary Interstate Highway, while the eastern portion is a state highway. The entire route was upgraded to Interstate Highway standards by 2007, and the California Department of Transportation (Caltrans) has requested permission to re-sign the eastern portion as an Interstate Highway.

The name Foothill Freeway is a reference to Foothill Boulevard and the San Gabriel Mountains, both of which run parallel to the freeway for most of its length. The freeway connects Los Angeles with its northern suburbs following the foothills of these mountains. The freeway runs from the Sylmar district of Los Angeles east to Redlands.

Currently all of the Foothill Freeway is designated Route 210. Historically, the Foothill Freeway spanned multiple numerical designations. Additionally, the I-210 designation has changed routings; previously including a portion of what is now the Orange Freeway (SR 57). East of Pasadena the Foothill Freeway parallels, and in some parts replaced, the route of former U.S. Route 66.

Route description[edit]

Freeway as seen from the Metro Gold Line Sierra Madre Villa Station

I-210's western terminus is at its junction with the Golden State Freeway (I-5), near the Sylmar district of Los Angeles. From that point, the freeway's alignment is generally diagonal as it heads southeast through the northeastern San Fernando Valley and the Crescenta Valley. After leaving Los Angeles, it enters northern Glendale and meets with the Glendale Freeway (State Route 2) before turning due south towards the junction with the Ventura Freeway (State Route 134) in Pasadena. At this interchange, the Foothill Freeway shifts its alignment and direction, becoming an east-west freeway. From the north, the primary through lanes of I-210 become the unsigned northern stub of unfinished I-710, while from the east, the through lanes of the Ventura Freeway become I-210 as the Ventura Freeway reaches its official eastern terminus. After intersecting the northern terminus of I-605 (the San Gabriel River Freeway), I-210 then continues east to the Orange Freeway (State Route 57) in Glendora. Heading east from the Orange Freeway interchange, until its eastern terminus at I-10 in Redlands, 210 is currently signed as a state route.

Portions of the Metro Gold Line of the LACMTA run in the median of the Foothill Freeway from Pasadena to Arcadia.

State Route 210 presently has two distinct segments:

I-210 and CA-210 as Foothill Freeway in Fontana, carpooling lane

The western freeway segment serves as the easternmost portion of the Foothill Freeway (Interstate 210). Consisting of newer freeway, beginning at the east end of I-210 near San Dimas, SR 210 extends eastward, eventually paralleling Highland Avenue, as it continues through Fontana. It intersects Interstate 15, an artery between Southern California and Nevada a few miles before it meets with Interstate 215 in San Bernardino.

The segment east of Interstate 215 is the former alignment of State Route 30. This segment extends eastward to junctions with Interstate 215, State Route 259, State Route 18 and State Route 330 in Highland. State Route 210 then curves southward and ends in a junction with Interstate 10 in Redlands.

The Glendora Curve is the former colloquial name for the interchange between State Route 57 and the Foothill Freeway, Interstate 210.[2] The "curve" portion refers to the interchange from the northbound lanes of State Route 57 to the westbound lanes of I-210, and from the eastbound lanes of I-210 to the southbound lanes of State Route 57. The origin of the name comes from its location in the city of Glendora. Prior to 2002, this interchange was entirely part of I-210, and the eastern terminus of I-210 ended several miles south of the curve at the Kellogg Interchange at the junctions of the Chino Valley Freeway, State Route 71, the San Bernardino Freeway, I-10, and Route 57. After the portion of I-210 south of the Glendora Curve was transferred to Route 57 in 2002, effectively extending Route 210 east past the Glendora Curve, the name Glendora Curve fell out of popular use.[3]

This route is part of the California Freeway and Expressway System[4] and is eligible for the State Scenic Highway System.[5]

Elevated portion of freeway in Monrovia.


The 210[edit]

1955 map of the planned Interstates in the Greater Los Angeles Area. The original proposal for present-day I-210 includes its original eastern terminus in Pomona.

Construction began on the freeway in 1958. The first section, between Flintridge (now La Cañada Flintridge) and Canada Avenue in Pasadena, was opened in 1966; it was then signed as State Route 118. In 1968, the Atchison, Topeka and Santa Fe Railway depot at Santa Anita, a historic structure built in 1890, was moved to the Los Angeles County Arboretum and Botanic Garden to make way for a section of the freeway passing through Arcadia.[6][7] The section from State Route 134 to the Kellogg Interchange with Interstate 10 at Pomona was completed in 1976.[8] The section between the Kellogg interchange and Glendora is no longer part of I-210. In 2003, this piece was renumbered as part of State Route 57, known as the Orange Freeway.

In the 1990s, Caltrans began constructing extensions to the freeway from Glendora east to the former Interstate 215/State Route 30 interchange in San Bernardino. In 2003, a 20-mile (32 km) segment east from Glendora to Fontana was completed, with the portion proceeding south from Glendora renumbered SR 57. The remaining section east of Interstate 15 between Fontana and Interstate 215 was opened on July 24, 2007.

Caltrans has petitioned AASHTO, the trade organization that oversees the designation and naming of the Interstate Highway system, to re-sign the entire Foothill Freeway, including the entire segments of State routes 210 and 30, as I-210. Upon completion of the new freeway segment west of I-215, State Route 30 from I-215 to I-10 in Redlands was re-signed as State Route 210. The re-signing in 2003 of the former portion of I-210 now signed as State Route 57 truncated I-210 from its parent route, I-10. Presuming that authority is given at some point in the future to re-sign the entirety of 210 as an interstate, I-210 will once again connect to its parent route, but much farther east in Redlands.

The western freeway segment, planned since the 1970s and completed in 2002, replaced a western surface street segment that began with Base Line Road (sometimes spelled Baseline Road) at its intersection with Foothill Boulevard in La Verne and extended eastward into Upland. In Upland it became 16th Street, then turned northward onto Mountain Avenue, then turned eastward onto 19th Street. It left Upland and continued eastward into Rancho Cucamonga. It then seemed to turn northward onto Haven Avenue and end at the western freeway segment. This segment is probably still signed as SR 30 — at least in some places if not ubiquitously — but some recently published maps are reflecting a signage change.

State Route 30 (see below for full history) was the former designation of State Route 210 and State Route 330. Route 30 ran from its interchange with I-210 in Glendora east to State Route 18 at Big Bear Lake. The easternmost portion of Route 30 was transferred to Route 330 in 1972. Thereafter, Route 30 was routed south to I-10 in Redlands. In 1999, the entirety of Route 30 from the Glendora Curve to Redlands was transferred to Route 210.

Route 210 from Route 5 to Route 10 in Redlands is known as the Foothill Freeway, as named by Senate Concurrent Resolution 29, Chapter 128 in 1991.[9]

State Route 30[edit]

SR 30 was adopted as a state route in 1933 as part of Legislative Route 190. It was an unsigned highway, running from LRN 9 (formerly US 66, Foothill Blvd) near San Dimas to LRN 26 (SR 38) near Redlands. It also ran from LRN 26 near Redlands to LRN 43 near Big Bear Lake, which would become part of SR 38.[10] During the renumbering of California routes, LRN 190 was split into two different routes. The western portion, between I-210 in San Dimas and Highland became SR 30. The eastern portion, between SR 38 in Redlands and Highland was combined with LRN 207 (currently SR 330) to form SR 106. In 1972, the northern portion of SR 106, between SR 30 and SR 18 would be renumbered SR 330.[11] The southern portion, between SR 30 and I-10 (SR 106 was moved to I-10 in 1965) was combined with SR 30.[12]

Initial freeway construction started in 1968, and constructed the freeway between SR 259 and Cedar St. in San Bernardino. Construction continued east in 1971, which brought the freeway just west of SR 330. Construction did not resume until 1989 which extended the freeway west to I-215. The last phase of construction started in 1992, which connected the route south to I-10.[13]

In 1968, the State requested that SR 30 be incorporated into the interstate system, but was declined.[12] The next effort started in 1998. The State decided to close the 25-mile gap between I-210 and SR 30. It also decided to number the new freeway as SR 210, in preparation of the route becoming an interstate. Also, when the new freeway was close to the existing route, the entire route would be renumbered SR 210. In addition, the short section of the Orange Freeway, which was numbered I-210, would be renumbered SR 57 to match the number used for the rest of the freeway. Construction started on the eastern end from Foothill Boulevard (Exit 47), and slowly moved east. In 2007, the mainline freeway section was completed, which ended the existence of SR 30.

I-215 interchange and I-210 redesignation[edit]

The final phase of the Foothill Freeway project involved the completion of the interchange with I-215 (Exit 74).[14] When the Foothill Freeway mainline was completed in 2007, Exit 74 had only four of its six ramps built, the missing moves being from 210 EB to 215 SB and from 215 NB to 210 WB. The flyover plans for these moves had to be recast to address potential soil liquefaction in the event of rupture of existing or undiscovered faults in the area during an earthquake; this project was separated from the main 210 project to avoid delaying the latter.[15] Completion of Exit 74 was also tied to the widening and improving of I-215 in the area. The flyover from northbound I-215 to westbound CA 210 opened on December 22, 2011,[16] while the eastbound CA 210 to southbound I-215 opened on July 23, 2012, thus completing the interchange.[17] With its completion, Caltrans is expected to petition AASHTO to designate the entire route as part of Interstate 210; once approved, the SR 210 green State Route signs will be replaced with Interstate 210 ones.[citation needed]

Exit list[edit]

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, and do not necessarily reflect current mileage. R reflects a realignment in the route since then.[1] The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

Los AngelesLos AngelesR0.001 I-5 (Golden State Freeway) – Los Angeles, SacramentoWestbound exit and eastbound entrance; signed as exits 1A (north) and 1B (south)
R0.841CYarnell StreetSigned as exit 1 eastbound
R1.922Roxford Street – Sylmar
R3.283Polk Street
R4.114Hubbard Street
R4.945Maclay Street – San Fernando
R5.916A SR 118 west (Ronald Reagan Freeway) – VenturaSigned as exit 6B westbound
R6.016BPaxton StreetSigned as exit 6A westbound
R7.828Osborne Street – Lake View Terrace
R9.449Wheatland Avenue – Lake View Terrace
R11.0811Sunland Boulevard – Sunland, Tujunga
R14.1714La Tuna Canyon Road
GlendaleR15.6216Lowell Avenue – Tujunga
R16.7717APennsylvania Avenue – La CrescentaSigned as exit 17 eastbound
 R17.3817BLa Crescenta Avenue – La CrescentaWestbound exit and eastbound entrance
 R18.2218Ocean View Boulevard – Montrose
GlendaleR18.8719 SR 2 west (Glendale Freeway) – Los AngelesWest end of SR 2 overlap
La Cañada FlintridgeR19.8820 SR 2 east (Angeles Crest Highway) – La Cañada FlintridgeEast end of SR 2 overlap
R20.6021Gould AvenueEastbound exit and westbound entrance
R20.8521Foothill BoulevardWestbound exit and eastbound entrance
PasadenaR21.5322ABerkshire Avenue, Oak Grove Drive
R22.4922BArroyo Boulevard, Windsor Avenue
R23.1923Lincoln Avenue, Washington Boulevard
R24.0624Seco Street, Mountain Street
R24.8625AColorado Boulevard – PasadenaEastbound exit and westbound entrance
R24.9625A SR 710 south (Long Beach Freeway) to SR 110 / Del Mar Boulevard, California BoulevardWestbound exit is via exit 26A
R24.9625B SR 134 west (Ventura Freeway) – Ventura, GlendaleSigned as exit 26A westbound
R25.2925Fair Oaks Avenue, Marengo AvenueWestbound exit and eastbound entrance; signed as exits 25A (south) and 25B (north)
R26.3326Lake AvenueSigned as exit 26B westbound
R26.9427AHill AvenueSigned as exit 27 eastbound
R27.4127BAllen AvenueWestbound exit and eastbound entrance
R28.2528Altadena Drive, Sierra Madre BoulevardWestbound exit is via exit 29A
R28.6829ASan Gabriel Boulevard – San Marino
R29.2929BMadre Street
R29.4930 SR 19 south (Rosemead Boulevard) / Michillinda AvenueSigned as exits 30A (south) and 30B (north) eastbound
ArcadiaR30.8231Baldwin Avenue – Sierra Madre
R31.8832Santa Anita Avenue – Arcadia
R32.8933Huntington Drive – Monrovia, Arcadia
MonroviaR33.9134Myrtle Avenue – Monrovia
R34.7435AMountain Avenue
DuarteR35.2435BBuena Vista Street
IrwindaleR36.4136A I-605 south (San Gabriel River Freeway)Signed as exit 36B westbound
R36.4136BMount Olive Drive (via I-605 north)Signed as exit 36A westbound
R37.8638Irwindale Avenue – Irwindale
AzusaR38.9639Vernon Avenue
R39.6040 SR 39 (Azusa Avenue)
R40.6041Citrus Avenue – Covina
GlendoraR41.5942Grand Avenue – Glendora
R43.1643Sunflower Avenue
R44.2044Lone Hill Avenue
R44.3845 SR 57 south (Orange Freeway) – Santa AnaEast end of I-210; west end of SR 210; exit to former I-210 east
San DimasR45.4646San Dimas Avenue – San Dimas
La VerneR46.6347 SR 66 east (Foothill Boulevard) – La VerneFormer US 66
R48.0848Fruit Street
ClaremontR49.5350Towne Avenue
R51.8552Base Line RoadFormer SR 30
San Bernardino
SBD 0.00-R33.18
Upland1.5054Mountain Avenue – Mount Baldy
3.4756Campus Avenue
Rancho Cucamonga4.6057Carnelian Street
5.9058Archibald Avenue
6.9159Haven Avenue
7.9160Milliken Avenue
9.1461Day Creek Boulevard
11.5064A I-15 (Ontario Freeway) – Barstow, San Diego
Fontana11.9364BCherry Avenue
12.93Beech AvenueHOV-only interchange
13.9366Citrus Avenue
14.9367Sierra Avenue
RialtoR16.0368Alder Avenue
R17.3970Ayala Drive
19.0071Riverside Avenue
19.6772Pepper AvenueProposed interchange
San Bernardino20.6973State Street, University Parkway
R21.8774 I-215 – Barstow, RiversideWestbound exit to I-215 south is via exit 75B; former I-15E
R22.9475AH StreetSigned as exit 75 eastbound
R23.1075B To I-215 south (SR 259 south) – Downtown San Bernardino, Los Angeles, RiversideEastbound exit is via exit 75
R24.2276 SR 18 north (Waterman Avenue)
R25.7278Del Rosa Avenue
R26.7379Highland Avenue
R28.6681 SR 330 north – Running Springs, Big Bear Lake
HighlandR29.3282Base Line Road
R30.23835th Street, Greenspot Road
RedlandsR32.3484San Bernardino Avenue
R33.1885 I-10 – Los Angeles, IndioEastbound exit and westbound entrance; signed as exits 85A (west) and 85B (east)
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also[edit]


  1. ^ a b c Staff. "State Truck Route List" (XLS file). California Department of Transportation. Retrieved August 21, 2012. 
  2. ^ City Minutes referencing colloquial name.[dead link]
  3. ^ Glendora Interchange[dead link]
  4. ^ "CA Codes (shc:250-257)". Retrieved 2013-01-26. 
  5. ^ "CA Codes (shc:260-284)". Retrieved 2013-01-26. 
  6. ^ "Early California History" (PDF). Los Angeles County Arboretum & Botanic Garden. Retrieved 2009-09-09. 
  7. ^ "Caminos – Newsletter of the Arcadia Historical Society" (PDF). Arcadia Historical society. July 2007. Retrieved 2009-09-09. 
  8. ^
  9. ^ 2007 Named Freeways, Highways, Structures and Other Appurtenances in California. Caltrans. p. 60. Retrieved 2007-03-28. 
  10. ^ Route 185-192. Accessed: 03-05-2010.
  11. ^ Route 105-112. Accessed: 03-05-2010.
  12. ^ a b Route 25-32. Accessed: 03-05-2010.
  13. ^ California Department of Transportation, Log of Bridges on State Highways, July 2009
  14. ^ I-215 North SR 210/215 Connector Project Fact Sheet. Caltrans. Accessed 03-05-2010.
  15. ^ SANBAG Measure I Freeway Projects. Accessed 10-18-2010[dead link]
  16. ^ @215news. "!/215NEWS/status/150253723074039808". I-215 Project on Twitter. Retrieved 1 January 2012. 
  17. ^ @215news. "". I-215 Project on Twitter. Retrieved 24 July 2012. 
  18. ^ California Department of Transportation, Log of Bridges on State Highways, July 2007
  19. ^ California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
  20. ^ California Department of Transportation, California Numbered Exit Uniform System, Interstate 210 Freeway Interchanges, Retrieved on 2009-02-07.

External links[edit]

Route map: Google / Bing