Interstate 10 in California

From Wikipedia, the free encyclopedia

Interstate 10 Main route of the Interstate Highway System
Santa Monica Freeway, San Bernardino Freeway Defined by S&HC § 310, maintained by Caltrans
Length:	242.54 mi[1] (390.33 km)
Formed:	August 7, 1947 by FHWA[2] July 1, 1964 by Caltrans[3]
West end:	SR 1 in Santa Monica
Major junctions:	I-5 in Los Angeles SR 57 / SR 71 in Pomona I-215 near San Bernardino SR 86S in Indio
East end:	I-10 towards Phoenix, AZ
State highways in California < SR 9 SR 12 > History - Unconstructed - Deleted - Freeway - Scenic
Wikimedia Commons has media related to: Interstate 10

In the U.S. state of California, Interstate 10, the major east-west Interstate Highway in the Southern United States, runs east from Santa Monica, California, on the Pacific Ocean, through Los Angeles and San Bernardino to the border with Arizona. In the Los Angeles area, it is known as the Santa Monica Freeway and San Bernardino Freeway, linked by a short concurrency on Interstate 5 (the Golden State Freeway) at the East Los Angeles Interchange. At the East LA Interchange, a short piece of the San Bernardino Freeway west of I-5 is part of the legislative definition of Route 10, but does not carry Interstate 10. This section of freeway, once a short Interstate 110 until 1968, is signed for I-10 eastbound and for U.S. Route 101 (its terminus, at the Santa Ana Freeway) westbound.

[edit] Route description

[edit] Santa Monica Freeway

The Santa Monica Freeway is the westernmost segment of Interstate 10, beginning at the western terminus of I-10 at the Pacific Coast Highway in Santa Monica, California and ending southeast of downtown Los Angeles at the famous East Los Angeles Interchange.

The Santa Monica Freeway interchange with the Harbor Freeway, as seen by traffic going westbound on the Santa Monica

Interstate 10 begins in the city of Santa Monica when State Route 1 turns into a freeway and heads east. SR 1 exits onto Lincoln Boulevard and heads south while I-10 continues east. Soon after it enters the city of Los Angeles, I-10 has a four-level interchange with Interstate 405. Interstate 10 then continues through Jefferson Park into downtown Los Angeles. On the western edge of downtown, I-10 has an interchange with Interstate 110 to the south and State Route 110 to the north. I-10 then travels along the southern edge of downtown to the East Los Angeles Interchange.^[4][5]

At the East Los Angeles Interchange, State Route 60 diverges east towards Riverside and Pomona. I-10 then turns north, running concurrently with Interstate 5 for a few miles. Then, Interstate 10 heads east and merges with the traffic from the spur to U.S. Route 101 (California) onto the San Bernardino Freeway.^[4][5]

The section between the Harbor and San Diego freeways is also signed as the Rosa Parks Freeway. The freeway is signed as the Christopher Columbus Transcontinental Highway in Santa Monica. The freeway is 14 lanes wide (two local, five express in each direction) from the Harbor Freeway interchange to the Arlington Avenue offramp; most of these lanes are full at peak travel times (even on Saturdays). The remainder of the freeway varies between eight and 10 lanes in width. The whole freeway was opened in 1964^{[citation needed]}.

While the construction of the Century Freeway several miles to the south eased traffic congestion to a considerable amount by creating an alternate route from downtown to Los Angeles International Airport, the Santa Monica Freeway is still one of the busiest freeways in the world. All three freeway-to-freeway interchanges along its length are notorious for their congestion and are routinely ranked among the top 10 most congested spots in the United States^{[citation needed]}.

Due to the high traffic volume, car accidents are so common that Caltrans has constructed special Accident Investigation Sites separated from the freeway by fences. These enable the California Highway Patrol to quickly clear accidents from the through traffic lanes, and the fences reduce congestion by preventing rubbernecking (where cars slow to watch the accident investigation)^{[citation needed]}.

[edit] Spur to US 101

A typical traffic jam on the Santa Monica Freeway, at 2:30 p.m. on a Wednesday afternoon

The legislative definition of Route 10 includes a spur from Interstate 5 (the Golden State Freeway) west to U.S. Route 101 (the Santa Ana Freeway) near downtown Los Angeles. This section of roadway, the westernmost part of the San Bernardino Freeway, was part of the original San Benardino Freeway, carrying U.S. Route 60, U.S. Route 70 and U.S. Route 99 long before the Golden State Freeway opened. It was added to the Interstate Highway System by 1958 as Interstate 110, but in 1968 it was removed from the system, becoming part of the definition of Route I-10.

This road is signed only for the roads it feeds into - US 101 north westbound and I-10 east eastbound. It has no interchanges except its ends. The exit numbers for I-10 is to follow the signed route of I-10 west along with I-5 south, but one exit on Route 10 - the eastbound for State Street and Soto Street before it merges onto I-10 eastbound - is numbered (as exit 19).^[6]

There is no access from Route 10 eastbound to I-5 northbound. ^[5]

[edit] San Bernardino Freeway

See also: San Bernardino Freeway

Interstate 10 heads east from Los Angeles, with two HOV lanes paralleling it on the north side. These roadways extend to Alameda Street on US 101, following the spur west to there. However, after the Interstate 710 interchange, these lanes merge back into the typical left lanes of each roadway. I-10 goes right next to California State University Los Angeles and goes through the cities of Monterey Park, Alhambra, Rosemead, San Gabriel, Rosemead, El Monte, and Baldwin Park before intersecting with Interstate 605.^[4][5]

The San Bernardino Freeway near the interchange with the Ontario Freeway (I-15).

East of Interstate 710, I-10 continues through Baldwin Park and West Covina into San Dimas, where I-10 intersects with State Route 57 (formerly part of Interstate 210) and State Route 71. I-10 then heads east through Pomona and Claremont into San Bernardino County.^[4][5]

In San Bernardino County, Interstate 10 travels through Montclair, Upland, and Ontario, providing access to Ontario International Airport. I-10 then has a four level interchange with Interstate 15 before traveling through Fontana, Rialto, and Colton. I-10 then intersects with Interstate 215 before briefly entering San Bernadino city proper and traveling through Loma Linda and Redlands. In Redlands, I-10 intersects with the State Route 210 freeway (currently signed as SR-30) and with State Route 38 before entering Yucaipa and eventually Riverside County.^[4][7]

In Riverside County, I-10 goes through Calimesa before entering Beaumont and merging with the eastern end of State Route 60. In Banning, I-10 has a diamond intersection with State Route 243 before going through the San Gorgonio Mountains and entering Palm Springs. I-10 intersects with the western end of State Route 111, whereas I-10 bypasses the town and connects to State Route 62, a major east-west route through the Mojave Desert. I-10 cuts through Cathedral City and passes just outside the city limits of Rancho Mirage, Palm Desert, and Indian Wells before entering Indio and running concurrently with State Route 111. I-10 then has an interchange in Coachella with the northern end of the State Route 86S freeway, which also carries the routing of SR-111. Past Coachella, I-10 traverses the Mojave Desert, with few junctions and no cities. Several miles east and roughly halfway between Indio and Blythe, in the community of Desert Center, I-10 intersects with State Route 177, a turnoff that connects to SR-62. Near the Arizona state line, I-10 meets the terminus of State Route 78. In the city of Blythe, I-10 runs concurrently with U.S. Route 95 as both routes cross the Colorado River into Arizona.^[4][7]

Notably, I-10 westbound is usually signed as towards San Bernardino and/or Los Angeles in the Mojave Desert. Eastbound, in San Gorgonio Pass, the signage bizarrely indicates "Indio, Other Desert Cities", and indicates "Blythe" after Indio - the first sign for Phoenix does not occur until after the SR 86S exit in Coachella^{[citation needed]}.

[edit] Legal definition

Legal Definition of Route 10: California Streets and Highways Code, Chapter 2, Article 3, Section 310

Route 10 is part of the Freeway and Expressway System, as stated by section 253.1 of the California State Highway Code.

Route 10 is part of the Scenic Highway System, as stated by section 263.3 of the California State Highway Code.

The Santa Monica Freeway is Route 10 from Route 1 to Route 5, as named by the State Highway Commission on April 25, 1957.^[8]

The Rosa Parks Freeway is Route 10 from Route 110 to Route 405, as named by Assembly Concurrent Resolution 134, Chapter 2 in 2002.^[9]

[edit] History

Interstate 10 after the 1994 collapse.

What is now Interstate 10 east of Los Angeles was generally part of the Atlantic and Pacific Highway, one of many transcontinental national auto trails. By 1926, when the United States Numbered Highways were assigned, the road across the desert east of Indio was unimproved, while the road from Indio west to San Bernardino (as well as various roads west to Los Angeles) was paved.^[10] In late 1926, U.S. Route 99 was designated along the section of road from San Bernardino to Indio, where it turned south along present State Route 86 on the west side of the Salton Sea.^[11] West of San Bernardino, US 99 ran to Los Angeles concurrent with U.S. Route 66 (via Pasadena) before turning north; this route to Los Angeles is north of the later alignment of Interstate 10.^[12] The piece of this between San Bernardino and Indio was defined in 1915 as Legislative Route 26. (It continued south from Indio via El Centro to Heber; see U.S. Route 99 and State Route 86 for details. A 1931 extension took it south to Calexico on present State Route 111.)^[13]

The route from Indio via Mecca to the Arizona state line near Blythe was defined in 1919 as pre-1964 Legislative Route 64. (Later extensions took LR 64 west along present State Route 74; a 1931 cutoff bypassed Mecca to the north.) LR 26 was extended west from San Bernardino to Los Angeles in 1931, running along an alignment south of the existing US 66/US 99.^[13] Neither of these was a signed route until ca. 1932, when U.S. Route 60 was extended west from Arizona to Los Angeles, running along LR 64 to Indio, LR 26 (with US 99) to Beaumont, pre-1964 Legislative Route 19 to Pomona, and LR 26 to Los Angeles. (The original alignment of LR 26 ran roughly where State Route 60 now is west of Pomona, but an alignment close to present I-10 opened ca. 1934.^[14][15]

Thus, in 1931, what is now I-10 east of Los Angeles had been defined as LR 26 from Los Angeles to Indio and LR 64 from Indio to Arizona. It was signed as US 99 from San Bernardino to Indio, and US 60 came along ca. 1932 from Los Angeles to Pomona and from Beaumont to Arizona. U.S. Route 70 was extended west from Arizona ca. 1936 along the whole route to Los Angeles,^[14] and, between 1933 and 1942,^[16] US 99 moved from US 66 to present I-10 between San Bernardino and Los Angeles, forming a three-way concurrency between Pomona and Los Angeles. Old alignments and names include Valley Boulevard, Ramona Boulevard and Garvey Avenue.

The route east from Los Angeles was added to the Interstate Highway System on August 7, 1947. It was assigned the I-10 number on August 14, 1957, and the short piece west of I-5 was approved as I-110 on November 10, 1958.^[2] By then, most if not all of the San Bernardino Freeway had been completed, and I-10 was signed along the existing freeway along with US 70, US 99, and part of US 60. Those three routes were all removed in the 1964 renumbering, leaving only I-10.

The part west of downtown Los Angeles was pre-1964 Legislative Route 173, defined in 1933 from Santa Monica to downtown Los Angeles.^[17] It was signed as State Route 26 by 1942, running along Olympic Boulevard.^[16] It was later replaced by the Santa Monica Freeway, and added to the Interstate Highway System on September 15, 1955. It too was assigned the I-10 number on August 14, 1957.^[2] It was completed ca. 1964,^[18] and became I-10 in the 1964 renumbering.

Portions of the Santa Monica Freeway going over La Cienega Boulevard collapsed after the Northridge earthquake on January 17, 1994.^[19].

[edit] Exit list

County	Location	Postmile[18]		#[6]	Destinations	Notes
		County	State
Los Angeles	Santa Monica	LA 2.16	2.16		SR 1 north (Pacific Coast Highway) – Oxnard	Westbound exit and eastbound entrance; west end of I-10
		LA 2.16	2.16	1A	4th Street, 5th Street	Westbound exit and eastbound entrance
		LA 2.16	2.16	1A	SR 1 south (Lincoln Boulevard) to SR 2 east	Signed as exit 1B westbound
		LA 3.07	3.07	1B	20th Street	Eastbound exit and westbound entrance
		LA 3.34	3.34	1C	Cloverfield Boulevard	Westbound exit and eastbound entrance
		LA 4.24	4.24	2A	Centinela Avenue
	Los Angeles	LA 4.51	4.51	2	Bundy Drive	Westbound exit and eastbound entrance; signed as exits 2B (south) and 2C (north)
		LA 5.42	5.42	3	I-405 (San Diego Freeway) – Sacramento, Long Beach	Signed as exits 3A (north) and 3B (south); serves Los Angeles International Airport
				4	National Boulevard, Overland Avenue
		LA 7.21	7.21	5	National Boulevard	Westbound exit and eastbound entrance
		LA 7.92	7.92	6	Robertson Boulevard – Culver City
		LA 8.83 LA 8.94	8.83 8.94	7A	SR 187 (Venice Boulevard) / La Cienega Boulevard
		LA 9.31	9.31	7B	Washington Boulevard, Fairfax Avenue
		LA 10.43	10.43	8	La Brea Avenue
		LA 11.39	11.39	9	Crenshaw Boulevard
		LA 12.32	12.32	10	Arlington Avenue
		LA 13.30	13.30	11	Western Avenue, Normandie Avenue
		LA 13.80	13.80	12	Vermont Avenue, Hoover Street
		LA 14.85	14.85	13	I-110 south (Harbor Freeway) / SR 110 north (Pasadena Freeway) – San Pedro, Pasadena, Downtown Los Angeles, Convention Center	Signed as exits 13A (south) and 13B (north) eastbound
				14A	Grand Avenue, Los Angeles Street – Convention Center	Eastbound exit is part of exit 13A
				14A	Maple Avenue	Eastbound exit and westbound entrance
				14B	San Pedro Street	No westbound entrance
				15A	Central Avenue
				15B	Alameda Street
				16A	Santa Fe Avenue, Mateo Street
		LA 17.98 LA 18.39	17.98 18.39	16B	I-5 south (Santa Ana Freeway) / SR 60 east (Pomona Freeway) / Soto Street – Santa Ana, Pomona	No exit number westbound; west end of I-5 overlap
					Boyle Avenue	Eastbound exit only
		LA 17.56	17.56	135A	Fourth Street
		LA 18.06	18.06	135B	Cesar Chavez Avenue	Eastbound exit and westbound entrance
		LA 18.45 LA 18.39	18.45 18.39	19B	I-5 north (Golden State Freeway) – Sacramento	East end of I-5 overlap; no exit number eastbound
		LA 18.52	18.52	19A	State Street	Westbound exit and eastbound entrance
		LA 18.39	18.39	19B	US 101 north (Santa Ana Freeway via San Bernardino Freeway) – Los Angeles	Westbound exit and eastbound entrance
				19C	Soto Street	Signed as exit 19 eastbound
See San Bernardino Freeway
San Bernardino	Colton	SBD 24.24	72.52	72	I-215 (Riverside Freeway) – San Bernardino, Barstow, Riverside
	San Bernardino	SBD 25.26	73.54	73	Waterman Avenue	Signed as exits 73A (south) and 73B (north) eastbound
	Loma Linda	SBD 26.27	74.55	74	Tippecanoe Avenue, Anderson Street	Serves Loma Linda University, San Bernardino Airport
		SBD 27.30	45.55	75	Mountain View Avenue – Bryn Mawr
	Redlands	SBD 28.30	51.11	76	California Street
		SBD 29.58	77.86	77A	Alabama Street
		SBD 29.70	51.25	77B	SR 210 west (Foothill Freeway) to SR 330 north – Highland, Mountain Resorts	Signed as exit 77C westbound; former SR 30
		SBD 29.82	78.10	77C	Tennessee Street	Signed as exit 77B westbound
		SBD 30.90	79.18	79	SR 38 (Orange Street) – Downtown Redlands
		SBD 31.87 SBD 32.11	80.15 80.39	80	University Street, Cypress Avenue
		SBD 33.13	81.41	81	Ford Street, Redlands Boulevard
	Yucaipa	SBD 34.29	82.57	82	Wabash Avenue	Westbound exit and eastbound entrance
		SBD 35.50	83.78	83	Yucaipa Boulevard – Yucaipa
		SBD 37.03	85.31	85	Oak Glen Road, Live Oak Canyon Road
Riverside	Calimesa	RIV 0.02	87.46	87	County Line Road
		RIV 0.82	88.26	88	Calimesa Boulevard – Calimesa
		RIV 1.92	89.36	89	Singleton Road	Westbound exit and eastbound entrance
		RIV 3.05	90.49	90	Cherry Valley Boulevard – Cherry Valley
		RIV 5.53	92.97	92	Oak Valley Parkway
	Beaumont	RIV 6.67	94.11	93	SR 60 west (Moreno Valley Freeway) – Riverside
		RIV 7.57	95.01	94	SR 79 (Beaumont Avenue) – Beaumont
		RIV 8.21	95.65	95	Pennsylvania Avenue	Westbound exit and eastbound entrance
	Banning	RIV 9.31	96.75	96	Highland Springs Avenue
		RIV 11.33	98.77	98	Sunset Avenue
		RIV 11.96	99.40	99	22nd Street – Downtown Banning
		RIV 12.86	100.30	100	SR 243 (8th Street) – Idyllwild
		RIV 13.86	101.30	101	Hargrave Street – Idyllwild
		RIV 14.76	102.20	102	Ramsey Street	Westbound exit and eastbound entrance
		RIV 16.54	103.98	103	Fields Road
		RIV 17.66	105.10	104	Apache Trail – Cabazon
		RIV 19.40	106.84	106	Main Street – Cabazon
		RIV 24.55	111.99	111	Haugen Lehmann Way
		RIV 25.19	112.63	112	SR 111 south – Palm Springs	Eastbound exit and westbound entrance; serves Agua Caliente Indian Reservation
		RIV 27.23	114.67	114	Whitewater
		RIV 29.68	117.12	117	SR 62 east – Twentynine Palms, Yucca Valley
		RIV 33.13	120.57	120	Indian Avenue – North Palm Springs
		RIV 36.14	123.58	123	Palm Drive – Desert Hot Springs
		RIV 39.49	126.93	126	Date Palm Drive
		RIV 43.36	130.80	130	Ramon Road, Bob Hope Drive – Palm Springs
	Palm Desert	RIV 44.54	131.98	131	Monterey Avenue – Thousand Palms
		RIV 46.90	134.34	134	Cook Street
		RIV 50.50	137.94	137	Washington Street
	Indio	RIV 52.34	139.78	139	Indio Boulevard, Jefferson Street – Indio
		RIV 54.74	142.18	142	Monroe Street – Central Indio
		RIV 55.74	143.18	143	Jackson Street
		RIV 56.95	144.39	144	SR 111 (Golf Center Parkway)
	Coachella	RIV 57.83	145.27	145	SR 86S south – Brawley, El Centro	Eastbound exit and westbound entrance
		RIV 58.89	146.33	146	To SR 86S south / Dillon Road – Coachella
		RIV 74.83	162.27	162	Frontage Road
		RIV 81.55	168.99	168	Mecca, Twentynine Palms	Former SR 195
		RIV 86.07	173.51	173	Chiriaco Summit
		RIV 90.12	177.56	177	Hayfield Road
		RIV 95.05	182.49	182	Red Cloud Road
		RIV 102.01	189.45	189	Eagle Mountain Road
		RIV 105.10	192.54	192	SR 177 (Desert Center Rice Road)
		RIV 114.40	201.84	201	Corn Springs Road
		RIV 129.94	217.38	217	Ford Dry Lake Road
		RIV 135.05	222.49	222	Wiley's Well Road
	Blythe	RIV 145.12	232.56	232	Mesa Drive – Blythe Airport, Mesa Verde
		RIV 149.16	236.60	236	SR 78 (Neighbours Boulevard) – Brawley
		RIV 152.15	239.59	239	Lovekin Boulevard – Blythe
		RIV 153.16	240.60	240	7th Street – Blythe
		RIV 154.16	241.60	241	US 95 north (Intake Boulevard) – Needles	West end of US 95 overlap
		RIV 156.38	243.82	243	Riviera Drive	Eastbound exit and entrance

[edit] References

[edit] External links

• WestCoastRoads: Interstate 10
• California Highways: I-10
• Cal-NExUS: Route 10 West
• Cal-NExUS: Route 10 East

Interstate 10
Previous state: Terminus	California	Next state: Arizona