Interstate 10 in California

Interstate 10 (I-10) is a transcontinental Interstate Highway in the United States, stretching from Santa Monica, California, on the Pacific Ocean, to Jacksonville, Florida. The segment of I-10 in California runs east from Santa Monica through Los Angeles, San Bernardino, and Palm Springs before crossing into the state of Arizona. In the Greater Los Angeles area, it is known as the Santa Monica Freeway and the San Bernardino Freeway, linked by a short concurrency on I-5 (Golden State Freeway) at the East Los Angeles Interchange. I-10 also has parts designated as either the Rosa Parks Freeway, the Redlands Freeway, or the Christopher Columbus Transcontinental Highway.[4]

Interstate 10
Christopher Columbus Transcontinental Highway
I-10 highlighted in red
Route information
Defined by Streets and Highways Code § 310
Maintained by Caltrans
Length	243.31 mi[1] (391.57 km)
Existed	August 7, 1947 by FHWA[2] July 1, 1964 by Caltrans[3]–present
Major junctions
West end	SR 1 in Santa Monica
	I-405 in Los Angeles I-110 / SR 110 in Los Angeles I-5 / US 101 / SR 60 in Los Angeles I-710 in Monterey Park I-605 in Baldwin Park I-15 in Ontario I-215 in Colton SR 210 in Redlands SR 60 in Beaumont US 95 in Blythe
East end	I-10 / US 95 at Arizona state line in Ehrenberg, AZ
Location
Counties	Los Angeles, San Bernardino, Riverside
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future State highways in California Interstate U.S. State Scenic History Pre-1964 Unconstructed Deleted Freeways ← SR 9 → SR 11

Route description

Interstate 10 begins at the McClure Tunnel in Santa Monica

The California Streets and Highways Code defines Route 10 from:

(a) Route 1 in Santa Monica to Route 5 near Seventh Street in Los Angeles.
(b) Route 101 near Mission Road in Los Angeles to the Arizona state line at the Colorado River via the vicinity of Monterey Park, Pomona, Colton, Indio, and Chiriaco Summit and via Blythe.

Despite the legislative definition, Caltrans connects the two sections of the route by cosigning I-10 down I-5 between the East LA Interchange and the Santa Monica Freeway, negating a section of the San Bernardino Freeway west of I-5. This short section of Route 10 between Route 5 and Route 101, which was formerly defined as Route 110 (signed as I-110) until 1968, is signed overhead for I-10 eastbound and for U.S. Route 101 (US 101) westbound. This I-5/I-10 cosigning is consistent with the Federal Highway Administration's Interstate Highway route logs that such an overlap exists for the segment of I-10 in California.[5]

I-10 is part of the California Freeway and Expressway System,[6] and is part of the National Highway System,[7] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[8] I-10 is eligible to be included in the State Scenic Highway System,[9] but it is not officially designated as a scenic highway by the California Department of Transportation.[10] The Santa Monica Freeway is Route 10 from Route 1 to Route 5, as named by the State Highway Commission on April 25, 1957. The section between the Harbor (I-110) and San Diego (I-405) freeways is also signed as the Rosa Parks Freeway, after the African American civil rights activist. The I-10 freeway is signed as the Christopher Columbus Transcontinental Highway in Santa Monica.[11]

Santa Monica Freeway

The Santa Monica Freeway is the westernmost segment of I-10 and a small section of State Route 1 (SR 1), beginning at the McClure Tunnel in Santa Monica and ending southeast of downtown Los Angeles at the East Los Angeles Interchange.

The Dosan Ahn Chang Ho Memorial Interchange, as seen by traffic going eastbound on the Santa Monica

Downtown Los Angeles skyline as seen from the freeway. A slight (smaller than usual rush hour) traffic jam is ahead.

I-10 begins its eastward journey in the city of Santa Monica when SR 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 I-405. I-10 then continues through Sawtelle, Rancho Park, Cheviot Hills, Beverlywood and Crestview in West Los Angeles, Lafayette Square and Wellington Square in Mid-City, Arlington Heights, West Adams and Jefferson Park into downtown Los Angeles. On the western edge of downtown at the Dosan Ahn Chang Ho Memorial Interchange, I-10 has an interchange with I-110 to the south and SR 110 to the north. I-10 then travels along the southern edge of downtown to the East Los Angeles Interchange.[12][13]

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

At the East Los Angeles Interchange, SR 60 diverges east towards Riverside and Pomona. I-10 then turns north, running concurrently with I-5 for approximately 1.5 miles (2.4 km). Then, I-10 heads east and merges with the traffic from the spur to US 101 onto the San Bernardino Freeway.[12][13]

Heavily defaced button copy sign marking an entrance to the Santa Monica Freeway, 2005

The freeway is 14 lanes wide (two local, five express in each direction) from the Harbor Freeway (I-110) interchange to the Arlington Avenue off-ramp. 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 opened in 1965 with 4 to 6 lanes, with a formal dedication held in 1966.[14]

While the construction of the Century Freeway several miles to the south reduced traffic congestion to a considerable amount by creating an alternate route from downtown to the 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.

Due to the high traffic volume, car accidents are so common that the California Department of Transportation (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 (in which vehicles slow down so their occupants can watch the accident investigation).[15]

The Santa Monica Freeway is considered the border between West Los Angeles and South Los Angeles. Part of the freeway also skims the Byzantine-Latino quarter, which is home to many immigrants affiliated with the Eastern Orthodox Church.

San Bernardino Freeway

Heavy traffic from downtown San Bernardino along the San Bernardino Freeway near the interchange with I-215

I-10 heads east from the Downtown Los Angeles Eastside Los Angeles region, with two high-occupancy toll (HOT) lanes paralleling it on the north side called the El Monte Busway. These roadways extend to Alameda Street on US 101, following the spur west to where I-10 passes California State University Los Angeles. However, after the I-710 interchange, these lanes merge back into the typical left lanes of each roadway.

East of I-710, I-10 continues through Monterey Park, Alhambra, Rosemead, San Gabriel, El Monte, and Baldwin Park before intersecting with I-605. It then travels through West Covina and Covina before heading up Kellogg Hill into San Dimas, where I-10 intersects with SR 57 (formerly part of I-210) and SR 71 at the Kellogg Interchange. I-10 then heads east through Pomona and Claremont, leaving Los Angeles County to enter San Bernardino County.[12][13]

Interchange with the Ontario Freeway (I-15) as seen by westbound traffic on the San Bernardino Freeway.

In San Bernardino County, I-10 travels through Montclair, Upland, and Ontario, providing access to Ontario International Airport. I-10 then has a four-level interchange with I-15 before traveling through Fontana, Rialto, and Colton. I-10 then intersects with I-215 before briefly entering San Bernardino city proper and traveling through Loma Linda and Redlands. In Redlands, I-10 intersects with the SR 210 freeway (future I-210) and with SR 38 before entering Yucaipa and eventually Riverside County.[12][16]

Riverside County

I-10 near the SR 111, looking east with the San Gorgonio Pass wind farm in the background. Note the overhead signs reading "Indio, other Desert Cities." Also note the signage for exit 112, since renumbered to exit 111.

Cabazon Dinosaurs is a roadside attraction at the Main Street exit in Cabazon.

In Riverside County, I-10 goes through Calimesa before entering Beaumont and merging with the eastern end of SR 60 (itself formerly the California segment of US 60). In Banning, I-10 has a diamond intersection with SR 243 before passing through San Gorgonio Pass between the San Bernardino Mountains and the San Jacinto Mountains (where the vegetation makes a rapid change between Mediterranean and desert ecology) and entering Palm Springs. The next 35 miles (56 km) of the freeway, between SR 111 and Dillon Road, was named the Sony Bono Memorial Freeway in 2002.[17] Although I-10 intersects with the northern terminus of SR 111, the major artery to Palm Springs, it mostly bypasses the city, then connects to SR 62, a major east–west route through the Mojave Desert. I-10 cuts through Cathedral City and passes just outside the northern city limits of Rancho Mirage, Palm Desert, and La Quinta before entering Indio. I-10 then has an interchange in Coachella with the northern end of the SR 86 expressway, which also leads to 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 SR 177, a turnoff that connects to SR 62. Near the Arizona state line, I-10 meets the terminus of SR 78. In the city of Blythe, I-10 runs concurrently with US 95 as both routes cross the Colorado River into Arizona.[12][16]

I-10 westbound is usually signed as towards San Bernardino and/or Los Angeles in the Mojave Desert. Eastbound, in the San Gorgonio Pass, the signage indicates "Indio, Other Desert Cities", and indicates "Blythe" after Indio; the first sign for Phoenix does not occur until Indio.

History

I-10 after the 1994 collapse

What is now I-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.[18] In late 1926, US 99 was designated along the section of road from San Bernardino to Indio, where it turned south along present SR 86 on the west side of the Salton Sea.[19] West of San Bernardino, US 99 ran to Los Angeles, concurrent with US 66 (via Pasadena) before turning north; this route to Los Angeles is north of the later alignment of I-10.[20] 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. A 1931 extension took it south to Calexico on present SR 111.)[21]

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 SR 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.[21] Neither of these was a signed route until around 1932, when US 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 SR 60 now is west of Pomona, but an alignment close to present I-10 opened around 1934).

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 around 1932 from Los Angeles to Pomona and from Beaumont to Arizona. US 70 was extended west from Arizona ca. 1936 along the whole route to Los Angeles, and, between 1933 and 1942, 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.

Interstate 10 eastbound near Indio

I-10 holds the distinction of being the first freeway in Los Angeles. A four-mile (6.4 km) section of today's freeway was built between 1933 and 1935 at a cost of $877,000 (equivalent to $13.1 million in 2019[22]). The "Ramona Boulevard" highway linked downtown Los Angeles to the communities of the southern San Gabriel Valley. The roadway, which opened on April 20, 1935, was dubbed the "Air Line route", and was seen as a major achievement in traffic design.[23]

The route east from Los Angeles was added to the Interstate Highway System on August 7, 1957. 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.[24] It was signed as SR 26 by 1942, running primarily Olympic Boulevard. 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 c. 1964,[25] and became Route 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, and were rebuilt using new Seismic-Resistant bridge designs.[26]

The El Monte Busway was converted to high occupancy toll (HOT) lanes in 2013 as part of the Metro ExpressLanes project.[27]

On July 19, 2015, a bridge carrying the eastbound lanes of I-10 near Desert Center collapsed from floodwater from the remnants of Hurricane Dolores, trapping a vehicle.[28][29]

Juan Bautista de Anza National Historic Trail

The I-10 is part of the auto tour route of the Juan Bautista de Anza National Historic Trail, a National Park Service unit in the United States National Historic Trail and National Millennium Trail programs. In 2005, Caltrans began posting signs on roads that overlap with the historic 1776 Juan Bautista de Anza trail route, so that California drivers can now follow the trail.

Future

With the increasing traffic volume between Los Angeles and San Bernardino, Caltrans has a few projects on the books to relieve the traffic congestion:

• Complete the construction of one high-occupancy vehicle lane in each direction between I-605 and SR 57.[30]
• Add two tolled express lanes in each direction between the Los Angeles/San Bernardino County line and Ford Street in Redlands.[31]

Exit list

County	Location	mi[1]	km	Exit[1]	Destinations	Notes
Los Angeles	Santa Monica	0.00	0.00	—	SR 1 north (Pacific Coast Highway) – Oxnard	Western end of SR 1 concurrency; former US 101 Alternate
				1A	4th Street / 5th Street	Westbound exit and eastbound entrance
		0.96	1.54	1B	Lincoln Boulevard to SR 1 south	Eastern end of SR 1 concurrency; signed as exit 1A eastbound; former SR 2 / US 66 / US 101 Alternate
					20th Street	Eastbound exit and westbound entrance
		2.08	3.35	1C	Cloverfield Boulevard	Westbound exit and eastbound entrance
		2.30	3.70	2A	Centinela Avenue	Signed as exit 2 eastbound
	Los Angeles	2.35	3.78	2B-C	Bundy Drive	Westbound exits and eastbound entrance; signed as exits 2B (south) and 2C (north)
		3.11– 3.29	5.01– 5.29	3	I-405 – Sacramento, LAX Airport, Long Beach	Signed as exits 3A (north) and 3B (south); former SR 7; exit 53B on I-405
		4.24	6.82	4	Overland Avenue / National Boulevard	No westbound signage for National Boulevard
		5.05	8.13	5	National Boulevard	Westbound exit and eastbound entrance
		5.76	9.27	6	Robertson Boulevard – Culver City
		6.81	10.96	7A	La Cienega Boulevard / Venice Boulevard (SR 187 west)	Venice Boulevard / SR 187 only signed westbound
		7.00	11.27	7B	Fairfax Avenue / Washington Boulevard
		8.27	13.31	8	La Brea Avenue
		9.23	14.85	9	Crenshaw Boulevard
		10.16	16.35	10	Arlington Avenue
		10.66	17.16	11	Western Avenue	No exit number westbound
				12	Normandie Avenue
		11.64	18.73		Vermont Avenue
		12.25	19.71		Hoover Street
		12.68– 12.73	20.41– 20.49	13A-B	I-110 south / SR 110 north / Pico Boulevard – San Pedro, Pasadena, Downtown, Convention Center	Dosan Ahn Chang Ho Memorial Interchange. Signed as exits 13A (south) and 13B (north) eastbound; exit 21 on I-110 / SR 110 / Harbor Freeway
				13C	Grand Avenue	No westbound exit
		13.64	21.95	14A	Maple Avenue	Eastbound exit and westbound entrance
					Los Angeles Street – Convention Center	Westbound exit and eastbound entrance
		14.22	22.88	14B	San Pedro Street	No westbound entrance
		14.55	23.42	15A	Central Avenue
		15.19	24.45	15B	Alameda Street
		15.71	25.28	16A	Mateo Street / Santa Fe Avenue
		16.23	26.12	—	SR 60 east to I-5 south – Pomona, Santa Ana	Eastbound exit and westbound entrance; exit 1A on SR 60
				—	Boyle Avenue	Eastbound exit only
				—	I-5 south to SR 60 east (Pomona Freeway) / Soto Street – Santa Ana, Pomona	Western end of I-5 overlap; westbound exit and eastbound entrance; eastern end of Santa Monica Freeway; exit 1E on SR 60
				135A[lower-alpha 1]	Fourth Street
				135B[lower-alpha 1]	Cesar Chavez Avenue	Eastbound exit and westbound entrance
		19.00– 19.07	30.58– 30.69	—	I-5 north – Sacramento	Eastern end of I-5 overlap; exit 135B-C on I-5
				19A	State Street	Westbound exit and eastbound entrance
				—	San Bernardino Freeway west to US 101 north (Santa Ana Freeway) – Los Angeles	Westbound left exit and eastbound entrance
				19C	Soto Street	No eastbound entrance; no exit number eastbound
					Marengo Street	Eastbound entrance only
	East Los Angeles	19.59	31.53	20A	City Terrace Drive	Eastbound exit and westbound entrance
		20.24	32.57	20B	Eastern Avenue	Westbound access is part of the I-710 exit; serves CSU Los Angeles
	Monterey Park	20.77	33.43	21	I-710 (Long Beach Freeway) / Valley Boulevard – Long Beach	Eastbound exit and westbound entrance also include ramps to/from Ramona Road; I-710 exit 22 northbound, 22A-B southbound
	Alhambra			—	I-10 Express Lanes – El Monte Busway	Left exit and entrances; no eastbound exit
		21.70	34.92	22	Fremont Avenue – South Pasadena
		22.72	36.56	23A	Atlantic Boulevard – Monterey Park
		23.38	37.63	23B	Garfield Avenue – Alhambra
	San Gabriel–Rosemead line	24.22	38.98	24	New Avenue
		24.72	39.78	25A	Del Mar Avenue – San Gabriel	Eastbound exit and westbound entrance for Express Lanes only; previously exit 25B
		25.23	40.60	25B	San Gabriel Boulevard
	Rosemead	25.73	41.41	26A	Walnut Grove Avenue
	Rosemead–El Monte line	26.35	42.41	26B	SR 19 (Rosemead Boulevard) – Pasadena	Includes access to/from Flair Drive eastbound
	El Monte	27.35	44.02	27	Temple City Boulevard	Westbound signage; previously exit 28
					Baldwin Avenue	Eastbound signage
		28.06	45.16	28	Santa Anita Avenue – El Monte	Previously exit 29
		28.89	46.49	29A	Peck Road South
		28.94– 29.22	46.57– 47.03	29B	Peck Road North, Valley Boulevard	Westbound exits signed as 29B (Valley Boulevard) and 29C (Peck Road North)
					I-10 Express Lanes	Eastern end of Express Lanes
		29.97	48.23	30	Garvey Avenue, Durfee Avenue	Westbound exit and eastbound entrance
	Baldwin Park	30.54– 30.59	49.15– 49.23	31A	I-605 (San Gabriel River Freeway)	Eastbound exits signed as 31A (south) and 31B (north); I-605 exit 22
		30.93	49.78	31B	Frazier Street	Signed as exit 31C eastbound; no eastbound entrance
		31.61	50.87	32A	Baldwin Park Boulevard – Baldwin Park
		32.05	51.58	32B	Francisquito Avenue – La Puente	No eastbound entrance; previously exit 33A
		32.74	52.69	33	Puente Avenue – Industry
	West Covina	33.85	54.48	34A	Pacific Avenue, West Covina Parkway	Signed as exit 34 eastbound
		34.24	55.10	34B	Sunset Avenue – West Covina	Westbound exit only
34.78		55.97	35	Vincent Avenue
35.89		57.76	36	SR 39 (Azusa Avenue)
36.87		59.34	37A	Citrus Street
37.40		60.19	37B	Barranca Street
37.90		60.99	38A	Grand Avenue
West Covina–Covina line	38.39	61.78	38B	Holt Avenue
Covina–San Dimas line	39.85	64.13	40	Via Verde
Pomona	41.41	66.64	41	Kellogg Drive	No eastbound entrance; serves Cal Poly Pomona
Pomona–San Dimas line	41.83	67.32	42A	SR 57 (Orange Freeway) to I-210 (Foothill Freeway) – Santa Ana	Signed as exit 42 westbound; SR 57 north is former I-210; SR 57 exit 21 northbound, 22A-B southbound
	42.07	67.71	42B	SR 71 south (Chino Valley Freeway) / Campus Drive – Corona	Westbound access is via exit 44; SR 71 exit 15
Pomona	43.05	69.28	43	Fairplex Drive	Westbound exit is part of exit 44; serves Los Angeles County Fair
	43.58	70.14	44	Dudley Street
	44.67	71.89	45A	White Avenue	Westbound access is via exit 45; previously exit 45
	45.12	72.61	45B	Garey Avenue, Orange Grove Avenue – Pomona	Signed as exit 45 westbound
	45.80	73.71	46	Towne Avenue
Claremont	47.13	75.85	47	Indian Hill Boulevard – Claremont
San Bernardino	Montclair	48.33	77.78	48	Monte Vista Avenue
		48.89	78.68	49	Central Avenue
	Ontario–Upland line	50.03	80.52	50	Mountain Avenue – Mount Baldy
		51.13	82.29	51	SR 83 (Euclid Avenue) – Ontario, Upland
	Ontario	52.90	85.13	53	4th Street
		53.76	86.52	54	Vineyard Avenue
		54.82	88.22	55A	Holt Boulevard	Eastbound access is via exit 54; former US 99 north
				55B	Archibald Avenue – Ontario Airport	Signed as exit 55 eastbound
		55.83	89.85	56	Haven Avenue
		56.84	91.48	57	Milliken Avenue
		57.60	92.70	58	I-15 (Ontario Freeway) – Corona, San Diego, Barstow, Las Vegas	Signed as exits 58A (north) and 58B (south) eastbound; I-15 exit 109 northbound, 109A-B southbound
	Ontario–Fontana line	58.79	94.61	59	Etiwanda Avenue, Valley Boulevard	Valley Boulevard was former US 99 south
	Fontana	60.83	97.90	61	Cherry Avenue
		62.84	101.13	63	Citrus Avenue
		63.88	102.80	64	Sierra Avenue – Fontana
	Bloomington	66.15	106.46	66	Cedar Avenue – Bloomington
	Rialto	67.33	108.36	68	Riverside Avenue – Rialto
	Colton	68.36	110.01	69	Pepper Avenue
		69.62	112.04	70A	Rancho Avenue
		70.28	113.10	70B	9th Street – Downtown Colton
		70.91	114.12	71	Mt. Vernon Avenue
		71.90	115.71	72	I-215 – San Bernardino, Barstow, Riverside	Former I-15E / US 91 / US 395; eastern end of San Bernardino Freeway; western end of Redlands Freeway; I-215 exit 40A-B northbound, 40 southbound
	San Bernardino	72.92	117.35	73	Waterman Avenue	Signed as exits 73A (south) and 73B (north) eastbound
	San Bernardino–Loma Linda line	73.93	118.98	74	Tippecanoe Avenue, Anderson Street – San Bernardino International Airport, Loma Linda University
	Loma Linda	74.96	120.64	75	Mountain View Avenue – Bryn Mawr
	Redlands	75.96	122.25	76	California Street
		76.97	123.87	77A	Alabama Street
		77.29	124.39	77B	SR 210 west (Foothill Freeway) to SR 330 north – Pasadena, Running Springs	Former SR 30 west; SR 210 exits 85A-B eastbound; future I-210
		77.45	124.64	77C	Tennessee Street
		78.56	126.43	79	SR 38 east (Orange Street) / Eureka Street	Eastbound signage
					6th Street to SR 38 – Big Bear	Westbound signage
		79.53	127.99	80	University Street	Eastbound signage
					Cypress Avenue	Westbound signage
		80.79	130.02	81	Ford Street, Redlands Boulevard	Redlands Boulevard is former US 99 north
	Yucaipa	81.95	131.89	82	Wabash Avenue	Westbound exit and eastbound entrance
		83.16	133.83	83	Yucaipa Boulevard – Yucaipa
		84.69	136.30	85	Oak Glen Road, Live Oak Canyon Road
		85.63	137.81	Wildwood Rest Area (eastbound only)
Riverside	Calimesa	86.84	139.76	87	County Line Road
		87.68	141.11	88	Calimesa Boulevard – Calimesa	Former US 99 north
		88.74	142.81	89	Singleton Road	Westbound exit and eastbound entrance
		89.87	144.63	90	Cherry Valley Boulevard – Cherry Valley
		90.88	146.26	Brookside Rest Area (westbound only)
	Beaumont	92.35	148.62	92	Oak Valley Parkway
		93.49	150.46	93	SR 60 west (Moreno Valley Freeway) – Riverside	Left exit westbound; no westbound entrance; former US 60 west
					6th Street – Beaumont	Eastbound exit and westbound entrance; former US 60 east / US 99 south
		94.39	151.91	94	SR 79 south (Beaumont Avenue)
		95.03	152.94	95	Pennsylvania Avenue	Westbound exit and eastbound entrance
	Beaumont–Banning line	96.13	154.71	96	Highland Springs Avenue
	Banning	98.15	157.96	98	Sunset Avenue
		98.78	158.97	99	22nd Street – Downtown Banning
		99.67	160.40	100	SR 243 south (8th Street) – Idyllwild
		100.68	162.03	101	Hargrave Street – Idyllwild
		101.58	163.48	102	Ramsey Street	Westbound exit and eastbound entrance; former US 60 west / US 99 north
	Cabazon	103.36	166.34	103	Malki Road	Formerly Fields Road
		104.48	168.14	104	Morongo Trail – Cabazon	Former US 99 south; formerly Apache Trail
		106.22	170.94	106	Main Street – Cabazon	Former US 99 north
	​	111.37	179.23	110	Railroad Avenue, Haugen–Lehmann Way – Whitewater	Formerly Verbena Avenue; previously exit 111
	Palm Springs	112.02	180.28	111	SR 111 south – Palm Springs	Eastbound exit and westbound entrance; previously exit 112
		113.07	181.97	Whitewater Rest Area
		114.05	183.55	114	Whitewater
		116.51	187.50	117	SR 62 east – Twentynine Palms, Yucca Valley	Signed as "29 Palms"
		119.95	193.04	120	Indian Canyon Drive – North Palm Springs	Formerly Indian Avenue
		122.96	197.88	123	Gene Autry Trail, Palm Drive – Desert Hot Springs
	Cathedral City	126.31	203.28	126	Date Palm Drive
	Rancho Mirage	130.18	209.50	130	Bob Hope Drive, Ramon Road – Palm Springs
	Palm Desert	131.33	211.36	131	Monterey Avenue – Thousand Palms
				133	Portola Avenue	Proposed interchange[32]
		133.71	215.19	134	Cook Street
		137.27	220.91	137	Washington Street
	Indio	139.16	223.96	139	Indio Boulevard, Jefferson Street – Indio	Indio Boulevard is former US 99 south / SR 86 south
		141.56	227.82	142	Monroe Street – Central Indio
		142.56	229.43	143	Jackson Street
		143.77	231.38	144	Golf Center Parkway to SR 111
	Coachella	144.65	232.79	145	SR 86 south (Expressway) – Brawley, El Centro	Eastbound exit and westbound entrance; former SR 86S
		145.71	234.50	146	Dillon Road to SR 86 south (Expressway) – Coachella	Signed as Dillon Road only eastbound
				149	Avenue 50	Proposed interchange[33]
	​	158.82	255.60	Cactus City Rest Area
	​	161.94	260.62	162	Frontage Road
	​	168.37	270.97	168	Cottonwood Springs Road – Mecca, Twentynine Palms	Former SR 195
	​	172.89	278.24	173	Summit Road – Chiriaco Summit
	​	176.94	284.76	177	Hayfield Road
	​	181.87	292.69	182	Red Cloud Road
	​	188.83	303.89	189	Eagle Mountain Road
	Desert Center	191.92	308.87	192	SR 177 north (Rice Road) – Desert Center
	​	201.22	323.83	201	Corn Springs Road
	​	216.76	348.84	217	Ford Dry Lake Road
	​	221.87	357.07	222	Wiley's Well Road – Wiley's Well Rest Area
	​	231.94	373.27	232	Mesa Drive – Blythe Airport, Mesa Verde	Former US 60 east
	Blythe	235.97	379.76	236	SR 78 west (Neighbours Boulevard south) / I-10 BL east (Neighbours Boulevard north) – Brawley
		238.97	384.58	239	Lovekin Boulevard – Blythe
		239.98	386.21	240	7th Street – Blythe
		240.99	387.84	241	US 95 north (Intake Boulevard) – Needles, Fairgrounds	Western end of US 95 overlap
				242	Hobsonway (I-10 BL)	Westbound exit and entrance
		242.92	390.94	243	Riviera Drive / I-10 BL west	Eastbound exit and entrance; westbound exit and entrance replaced by exit 242; I-10 Bus. is former US 60 west
				Agricultural Inspection Station (westbound only)
Colorado River		243.31	391.57	California–Arizona line
					I-10 east / US 95 south – Phoenix, Yuma	Continuation into Ehrenberg, Arizona
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Electronic toll collection       Incomplete access       Route transition

1. Exit number follows I-5 rather than I-10.

Spur to US 101

Interstate 10 Spur to US 101
Location	Los Angeles
Length	1.0 mi (1.6 km)
Existed	1964–present

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

This road is signed only for the roads it feeds into: US 101 northbound and I-10 eastbound. It has only two interchanges between its ends: a westbound exit off the spur at Mission Road immediately before merging with US 101 northbound, and the eastbound exit for State Street and Soto Street before it merges onto I-10 eastbound—this one is numbered (as exit 19).[1] There is no access from the I-10 spur to I-5.[13]

Exit list
The entire route is in Los Angeles, Los Angeles County.

mi[1]	km	Exit[34]	Destinations	Notes
0.0	0.0	—	US 101 north (Santa Ana Freeway)	Western terminus of San Bernardino Freeway; no access to US 101 south; US 101 exit 1D
0.1	0.16	—	Mission Road	Westbound exit and eastbound entrance; also includes access from Pleasant Avenue and northbound US 101 (via exit 1D) onto entrance ramp
0.6	0.97	19	State Street to Soto Street	Eastbound exit and westbound entrance
1.0	1.6	—	I-10 east (San Bernardino Freeway east)	No access to I-10 west; freeway continues as I-10 east
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Incomplete access       Route transition

See also

•  California Roads portal

• Lloyd G. Davies, Los Angeles City Council member, 1943–51, urged rail transportation on the Santa Monica Freeway

References

1. Warring, KS (April 18, 2008). "Interstate 10 Freeway Interchanges" (PDF). California Numbered Exit Uniform System. California Department of Transportation. Retrieved February 5, 2009.
2. "Interstate Highway Types and the History of California's Interstates". California Highways. Retrieved November 29, 2011.
3. "Interstate 10". California Highways. Retrieved November 29, 2011.
4. 2004 Named Freeways, Highways, Structures and Other Appurtenances In California (PDF). California Department of Transportation. January 2004. pp. 7–8. Archived (PDF) from the original on November 7, 2005. Retrieved December 8, 2017.
5. Adderly, Kevin (December 31, 2014). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways as of December 31, 2014". Route Log and Finder List. Federal Highway Administration. Retrieved December 6, 2015.
6. "Article 2 of Chapter 2 of Division 1". California Streets and Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
7. Federal Highway Administration (March 25, 2015). National Highway System: California (South) (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved October 20, 2017.
8. Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
9. "Article 2.5 of Chapter 2 of Division 1". California Streets & Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
10. California Department of Transportation (August 2019). "Officially Designated State Scenic Highways and Historic Parkways" (XLSX). Sacramento: California Department of Transportation. Retrieved October 20, 2017.
11. California Department of Transportation; California State Transportation Agency (January 2015). 2014 Named Freeways, Highways, Structures and Other Appurtenances in California. Sacramento: California Department of Transportation. pp. 25–26, 28. Archived from the original (PDF) on May 30, 2015. Retrieved May 30, 2015.
12. Rand McNally (2008). The Road Atlas (Map). Chicago: Rand McNally. pp. 15, 17, 18–19.
13. Thomas Brothers (1999). Los Angeles and Orange Counties Street Guide and Directory (Map). Thomas Brothers. pp. 671, 631, 632, 633, 634, 635, 636, 596, 597, 637, 638, 598, 599, 639, 640, 600, 641.
14. Masters, Nathan (September 10, 2012). "Creating the Santa Monica Freeway". KCET. Retrieved July 4, 2016. Photo caption: Opening of the Interstate 10 freeway into Santa Monica on January 5, 1966.
15. Dimassa, Cara Mia (November 27, 2001). "Freeway a Mess? Stop and Take a Look at Yourself". Los Angeles Times. Retrieved July 4, 2016.
16. Thomas Brothers (1999). San Bernardino and Riverside Counties Street Guide and Directory (Map). Thomas Brothers. pp. 601, 602, 603, 604, 605, 606, 607, 608, 648, 649, 689, 690, 720, 721, 722, 723, 724, 725, 726, 756, 757, 758, 788, 390, 819, 5410, 5471, 391, 392, 5491.
17. Trone, Kimberly (January 11, 2002). "Freeway Signs Pay Tribute to Bono". The Desert Sun. p. B1.
18. Rand McNally (1926). California (Map). Chicago: Rand McNally. Archived from the original on July 26, 2011. Retrieved November 29, 2011.
19. United States Numbered Highways. American Association of State Highway Officials. 1927.
20. Rand McNally (1926). Los Angeles and Vicinity (Map). Chicago: Rand McNally. Archived from the original on May 25, 2011. Retrieved November 29, 2011.
21. "Chronology of California Highways 1915–1932". California Highways. Retrieved November 29, 2011.
22. Thomas, Ryland; Williamson, Samuel H. (2020). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved September 22, 2020. United States Gross Domestic Product deflator figures follow the Measuring Worth series.
23. Masters, Nathan (August 15, 2012). "L.A.'s First Freeways". KCET. Retrieved April 4, 2013.
24. "Chronology of California Highways 1933–1946". California Highways. Retrieved November 29, 2011.
25. California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
26. "The Northridge Earthquake: Progress Made, Lessons Learned in Seismic-Resistant Bridge Design". Public Roads. Federal Highway Administration. Summer 1994. Retrieved November 29, 2011.
27. "Metro ExpressLanes to Open on San Bernardino (10) Freeway". Los Angeles: KNBC-TV. February 22, 2013. Retrieved February 28, 2013.
28. Brunell, Natalie; Terlecky, Megan (July 19, 2015). "Bridge Collapses on I-10 in Desert Center, Traps Vehicle". Palm Springs, CA: KESQ-TV. Archived from the original on July 21, 2015. Retrieved July 19, 2015.
29. "Bridge over 10 Fwy East of Coachella Collapses into Flood Waters". Los Angeles: KABC-TV. July 20, 2015. Retrieved July 20, 2015.
30. Caltrans. "San Bernardino Freeway (I-10) High Occupancy Lane Project". State of California. Retrieved November 12, 2018.
31. "I-10 Corridor Project Overview". The I-10 & I-15 Corridor Projects. Retrieved November 14, 2018.
32. Department of Public Works. "I-10/Portola Avenue Interchange Project". City of Palm Desert. Retrieved July 19, 2019.
33. DiPierro, Amy. "A developer bought four square miles north of I-10 in Coachella for $14 million". Desert Sun. Retrieved August 8, 2019.
34. Google (May 15, 2015). "Map of the I-10 spur (San Bernardino Freeway)" (Map). Google Maps. Google. Retrieved May 15, 2015.

External links

• Interstate 10, Interstate-Guide.com
• Interstate 10, California @ AARoads.com
• Interstate 10 highway conditions, Caltrans
• Interstate 10, California Highways
• Juan Bautista de Anza National Historic Trail official U.S. National Park Service website