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For the State Route 10 existing from 1934 until ca. 1960, see State Route 42.

Interstate 10 in California         Major cities         Route description             State Route 10         History         Exit list             State Route 10

Type Interstate Route 10 Length Mi 242.54 top Major cities Bolded cities are officially-designated control cities for signs. Santa Monica Los Angeles San Bernardino Riverside Redlands Indio Blythe Phoenix, Arizona top Route description top State Route 10 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 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 follow the signed route of I-10 along I-5, but one exit on SR 10 - the eastbound for State Street and Soto Street before it merges into I-10 eastbound - is numbered (as exit 19). top History 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.1926 Rand McNally California map 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.American Association of State Highway Officials, United States Numbered Highways, 1927 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 10.1926 Rand McNally Los Angeles and vicinity map 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.)California Highways: Chronology of California Highways 1915-1932 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. 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.U.S. Highways: East-West Routes1933 Rand McNally Los Angeles and vicinity map 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, and, between 1933 and 1942,1942 Gousha Los Angeles and vicinity map 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. 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.California Highways: Chronology of California Highways 1933-1946 It was signed as State Route 26 by 1942, running along 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. It was completed ca. 1964,January 1, 2006 California Log of Bridges on State Highways and became I-10 in the 1964 renumbering. top Exit list top State Route 10   --> Search more:       Source Privacy License Download Contact Us Atlas Scientus.org Dictionary (Yet Another Wiki) RC : 1.41 MIT OpenCourseWare This article is licensed under the GNU Free Documentation License [copyleft]. It uses material from the Wikipedia article "Interstate 10 in California". link