Interstate 105
Century Freeway Glenn Anderson Freeway
I-105 highlighted in red
Route information
Auxiliary route ofI-5
Maintained byCaltrans
Length	18.82 mi[1] (30.29 km) 17.64 miles (28.39 km) perFHWA[2]
History	1963–1968 nearEast Los Angeles Interchange part ofUS 101 (Santa Ana Freeway) 1982–1993 Century Freeway (completed)[3]
NHS	Entire route
Major junctions
West end	SR 1 nearEl Segundo
Major intersections	I-405 on theLos Angeles-Hawthorne border I-110 inLos Angeles I-710 on theLynwood-Paramount border
East end	I-605 / Studebaker Rd inNorwalk
Location
Country	United States
State	California
Counties	Los Angeles
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future State highways in California Interstate US State Scenic History Pre‑1964 Unconstructed Deleted Freeways
←SR 104 →SR 107

Interstate 105 (I-105, locally referred to asthe 105) is an east–westauxiliary Interstate Highway in theGreater Los Angeles urban area ofSouthern California. It runs fromState Route 1 (SR 1) nearEl Segundo andLos Angeles International Airport (LAX) to Studebaker Road in theCity of Norwalk. It is commonly known as theCentury Freeway afterCentury Boulevard which it parallels, and also officially known as theGlenn Anderson Freeway after the late congressmanGlenn M. Anderson who advocated for its construction.^[4][5][6][7]

The entirety of I-105 is defined in section 405 of theCalifornia Streets and Highways Code asRoute 105, and that the highway is from "Pershing Drive nearEl Segundo toRoute 605".^[8]

Route 105 was never fully constructed as it is defined. Currently, the western terminus of I-105 is atSepulveda Boulevard (SR 1) andImperial Highway on the southern edge ofLos Angeles International Airport (LAX), near theEl Segundo–Los Angeles line. Motorists can still continue west via Imperial Highway over conventional roadway to Pershing Drive.Caltrans actually set Route 105'smile 0 along Imperial Highway about 0.5 miles (0.80 km) west of SR 1,^[9] but that segment is neither signed as part of I-105 or included in theFederal Highway Administration (FHWA)'s Interstate Highway route logs.^[10] Caltrans does not have any intention to adopt Imperial Highway further west to Pershing Drive as part of the state highway system or construct an extension of I-105 over it. A portion of undeveloped land south of this section of Imperial Highway exists to facilitate a potential extension of the freeway.

East of Sepulveda Boulevard, I-105 intersects withI-405 (San Diego Freeway) at theLennox–Hawthorne line, then continues east near the northern city limits of Hawthorne and the southern city limits ofInglewood. Upon reaching theHarbor Gateway neighborhood of Los Angeles, I-105 intersects withI-110 at the five-levelJudge Harry Pregerson Interchange. I-105 continues east intoWillowbrook before entering the city ofLynwood, where it has a four-level interchange withI-710 and crosses theLos Angeles River. I-105 then runs throughParamount before enteringDowney. In Downey, I-105 intersects withLakewood Boulevard (SR 19). I-105 then entersNorwalk, where it meets withI-605. Although Route 105's aforementioned state legal definition sets its eastern terminus at I-605,^[8] theHOV lanes extend approximately 0.3 miles (0.48 km) further east to anat-grade intersection with Studebaker Road; this segment is also included in both state and federal records.^[9][10]

The freeway never intersects its parent route,I-5. I-105 complies with numbering conventions by intersecting other auxiliary routes of I-5 that do intersect I-5, namely I-405 and I-605.

Much of the length of the Century Freeway runs parallel to Imperial Highway. It also runs parallel to (and 1 mi (1.6 km) south of)Century Boulevard, from which its original name is derived. Century Boulevard, in turn, is named for its position equivalent to100th Street in the Los Angeles grid.

TheLos Angeles Metro RailC Line runs in the median of nearly the entire length of I-105. The C Line's eastern terminus is atNorwalk, at the interchange between I-105 and I-605. 2 mi (3.2 km) from the western end of the freeway, the C Line separates onto its own right-of-way atAviation Boulevard before turning north towardsthe LAX area, where a futurepeople mover connecting Metro Rail to airport terminals is scheduled to open in 2026.

I-105 is part of theCalifornia Freeway and Expressway System,^[11] and is part of theNational Highway System,^[10] a network of highways that are considered essential to the country's economy, defense, and mobility by theFederal Highway Administration.^[12]

I-105 was an integral part of aCaltrans 1960s master plan for theSouthern California freeway system, but did not open until 1993. The right-of-way was included on several early highway plans since at least 1947, although it was not named the "Century Freeway" until 1956, and was numbered Route 42. In 1965, the Century Freeway was added to the state system originated at State Route 1 (Sepulveda Boulevard) east toCentral Avenue in the City of Los Angeles along an alignment very near to the current right-of-way.^[13] The current route was added to the Interstate system in 1968.

The route was designed between 1968 and 1972 by Caltrans District 7, under the direction of Design Chief Sid Elicks.^[7] However, opposition from some of the communities through which the right-of-way would pass slowed the process and led to some reroutings. Many factors contributed to the delay. The growth of theenvironmental movement in the 1960s created resistance to new freeway construction. Fiscal difficulties brought about by the 1971Sylmar earthquake and the Californiatax revolt of the late 1970s further hampered Caltrans' construction efforts.^[14]

The major source of resistance to the freeway's construction wascommunity opposition and the side effects of these demands. By the early 1970s, most of the areas in the freeway's path (and thus slated to be demolished) were predominantlyAfrican-American. Resentment over previous freeway projects' effects on other black communities resulted in significant modifications to the original route. Most cities along the way, weary of the noise and visual blight created by elevated freeways, demanded that the route be built far below grade in a "trench". Also, another source for resistance to the freeway's construction was that much of the I-105 path was going to be built in low income, high crime neighborhoods, which also delayed the freeway's construction until the crime in the areas went down.^{[citation needed]}

Norwalk was opposed to the freeway's proposed route through its city center, and blocked the freeway from reaching its intended terminus at theSanta Ana Freeway (I-5); however, Caltrans had already decided to abandon that section due to the inability of the severely congested Santa Ana Freeway to accommodate any more traffic.^{[citation needed]}

In 1972, community opposition resulted in a federal lawsuit,Keith v. Volpe, being filed, charging a violation of various civil rights protections and theNational Environmental Policy Act (NEPA). An important figure in the freeway's history wasHarry Pregerson, aUnited States federal judge who presided over the lawsuit concerning the freeway's construction and chose to continue presiding over the case despite being promoted to a higher level court.^[15] The interchange with I-110 is named theJudge Harry Pregerson Interchange in his honor.^[16] In 1972, Judge Pregerson enjoined the further development of the freeway until it has complied with the requirements of NEPA, theCalifornia Environmental Quality Act (CEQA), theFederal-Aid Highway Act, and theUniform Relocation Assistance and Real Property Acquisition Act of 1970.

In 1979, this lawsuit resulted in a Consent Decree, amended in 1981, which imposed several conditions on the development of the freeway, including additional public hearings, preparation of an environmental report, alterations to the design to reduce lanes and intersections, improve carpooling and provide for a transitway, which became theLos Angeles Metro Rail Green Line, now known as theC Line. A portion of the right-of-way was also to be constructed below grade to buffer adjacent areas from the effects oftraffic noise. After construction began in the 1980s, failure to perform a complete survey of the area'sgroundwater deposits, combined with the 20–30-foot (6.1–9.1 m) below-grade trench through the city ofDowney, resulted in buckling and cracking along the eastern portions of the route. At one point, a giant sinkhole opened in the Bellflower Boulevard on-ramp. This resulted in the construction of an elaborate pump system along the freeway between the interchanges withI-710 andI-605.

A significant aspect of theKeith v. Volpe Consent Decree was the requirement that the housing removed to construct the freeway be replaced, leading to the creation of theCentury Freeway Housing Program within theCalifornia Department of Housing and Community Development.

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TheHawthorne childhood home ofBrian,Carl andDennis Wilson ofthe Beach Boys was demolished in the mid-1980s to make way for the freeway, as was the house across the street where their bandmateDavid Marks grew up. In 2005, theBeach Boys Historic Landmark was built on the former site of the Wilson brothers' home and declared a California Historic Landmark.

The birthplace of formerMetallica bassistRon McGovney's house stood directly in the path of the route nearby to I-605 inDowney.

Another home in Downey, where siblingsRichard andKaren Carpenter grew up before forming the musical duothe Carpenters, was also razed for I-105.

Throughout the difficulties, CongressmanGlenn M. Anderson (D-San Pedro) tirelessly advocated for the route's construction, making claims it would provide congestion relief alongCentury, Manchester, and Firestone Boulevards and theImperial Highway, as well as relieving pressure on theSanta Monica (I-10) andSan Diego (I-405) Freeways for travelers betweenDowntown Los Angeles andLAX.^{[citation needed]} After Anderson's death in 1994, Caltrans honored him by renaming the freeway in his honor. The route's original name, "Century Freeway", is still used on a number of maps.^[17]

The freeway was originally signed with El Segundo as its westboundcontrol city; however, in recent years, many of the El Segundo signs have been replaced and/or covered with "LAX Airport" signage due to the western terminus' proximity toLos Angeles International Airport.

Shortly before opening, filmmakers had access to use the empty freeway for a number of weeks to film the 1994 motion pictureSpeed.

Previously, the I-105 designation was used forU.S. Route 101 (theSanta Ana Freeway, US 101) fromI-5 (theGolden State Freeway) at theEast Los Angeles Interchange to the connection toI-10 (theSan Bernardino Freeway; this connection had beenI-110); it went back to US 101 in 1968.^[18]

There are plans to convert the existingHOV lanes intohigh-occupancy toll (HOT) lanes. Segment 1 of the project between Sepulveda Bouelvard and Central Avenue is scheduled to be completed in 2028. As of 2025^[update], both segment 2 between Central Avenue and I-710, and segment 3 between I-710 and Studebaker Road, are in the design and engineering phase.^[19]

The entire route is inLos Angeles County.

Location	mi[9][1][20]	km	Exit[20]	Destinations	Notes
Los Angeles	0.00	0.00	1A	Imperial Highway west	Continuation beyond the western terminus of Route 105 at this point; posted as exit 1A at the SR 1 (exits 1B–C) interchange
	0.05	0.080		California Street	At-grade intersection
			West end of freeway
	0.50	0.80	1	Imperial Highway east	Eastbound signage; signed western terminus of I-105
			1B	SR 1 south (Sepulveda Boulevard)	Westbound signage
			1C	SR 1 north (Sepulveda Boulevard) –LAX Airport
	0.99	1.59	1D	Nash Street –LAX Airport Alt. Exit	Westbound exit and eastbound entrance
	2.01	3.23	2A	La Cienega Boulevard /Aviation Boulevard	Westbound exit and eastbound entrance
Los Angeles–Lennox– Hawthorne–Del Aire quadripoint	2.01– 2.11	3.23– 3.40	2B	I-405 (San Diego Freeway) –Santa Monica,Long Beach	Sadao S. Munemori Memorial Interchange. Signed as exit 2 eastbound; formerSR 7; I-405 north exit 45A, south exit 45
Hawthorne–Lennox– Inglewood tripoint	3.32	5.34	3	Prairie Avenue /Hawthorne Boulevard	Hawthorne Boulevard not signed eastbound
Hawthorne	4.71	7.58	5	Crenshaw Boulevard
Los Angeles–West Athens line	6.77	10.90	7A	Vermont Avenue
Los Angeles	7.39	11.89	7B	I-110 (Harbor Freeway) –Los Angeles,San Pedro	Judge Harry Pregerson Interchange; I-110 north exits 14A-B, south exit 14A
			—	I-110 Express Lanes north	Two-lane left exit; left lane tolled, right lane freeHOV access only
Los Angeles–Willowbrook line	8.90	14.32	9	Central Avenue
Willowbrook	9.78	15.74	10	Wilmington Avenue
Lynwood	11.51	18.52	12	Long Beach Boulevard
Lynwood–Paramount line	13.47	21.68	13	I-710 (Long Beach Freeway) –Pasadena,Long Beach	I-710 north exits 11A-B, south exit 11A
Paramount	14.13	22.74	14	Garfield Avenue	Eastbound exit and westbound entrance
	14.65	23.58	15	Paramount Boulevard	Westbound exit and eastbound entrance
Downey	15.67	25.22	16	SR 19 (Lakewood Boulevard)
	16.64	26.78	17	Bellflower Boulevard
Norwalk	17.82	28.68	18A	I-605 south (San Gabriel River Freeway)	Eastern terminus for I-105's non-HOV traffic; I-605 exit 9B; exit to I-605 south also includes direct exit ramp for Rosecrans Avenue
			18B	I-605 north (San Gabriel River Freeway)
	17.91	28.82	♦	Hoxie Avenue –Norwalk Metro Station	HOV exits only; all traffic allowed on entrances; westbound entrance also includes direct entrance ramp from Imperial Highway
	18.15	29.21	♦	Studebaker Road	Eastern terminus of I-105's HOV lanes; all traffic is allowed on direct eastbound ramp from Hoxie Avenue;at-grade intersection
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Electronic toll collection       HOV only       Incomplete access

• California Roads portal
• Greater Los Angeles portal

Wikimedia Commons has media related toInterstate 105 (California).

• Caltrans: I-105 highway conditions
• Caltrans Traffic Conditions Map
• California Highway Patrol Traffic Incidents
• California @ AARoads.com - Interstate 105
• California Highways: I-105
• Interstate 105 @ Asphaltplanet.ca

• Interstate Highways in California
• Interstate 5
• Southern California freeways
• Auxiliary Interstate Highways
• Roads in Los Angeles County, California
• Inglewood, California
• Hawthorne, California

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