Santa Ana Freeway highlighted in red
|Maintained by Caltrans|
| I-5 from Irvine to Boyle Heights, Los Angeles
US 101 from Boyle Heights to Downtown Los Angeles
|South end||I-5 / I-405 (El Toro Y) in Irvine|
| SR 22 / SR 57 (Orange Crush) in Orange
I-605 in Downey
I-5 / I-10 / US 101 (East LA Int.) / SR 60 in Boyle Heights
|North end||US 101 / SR 110 (4 Level Int.) in Downtown Los Angeles|
|Counties||Orange, Los Angeles|
The Santa Ana Freeway is one of the principal freeways in Southern California, connecting Los Angeles and its southeastern suburbs including the freeway's namesake, the city of Santa Ana. The freeway begins at its junction with the San Diego Freeway (Interstate 405), called the El Toro Y, in Irvine, signed as Interstate 5. From there, it generally goes southeast to northwest to the East Los Angeles Interchange, where it takes the designation of U.S. Route 101. It then proceeds 2.95 miles (4.75 km) northwest to the Four Level Interchange (also known as the Bill Keene Memorial Interchange) in downtown Los Angeles.
North of the East Los Angeles Interchange complex, Interstate 5's name changes to the Golden State Freeway. South of the El Toro Y, Interstate 5 takes on the San Diego Freeway name from Interstate 405.
An abundance of landmarks, most importantly Disneyland and Angel Stadium of Anaheim, along the Orange County portion of its route combines with a severe bottleneck beginning at the Los Angeles County border (shrinking from 10 to 6 lanes) to make it one of the most congested freeways in Southern California. The infamously busy intersection of the Santa Ana, Garden Grove, and Orange freeways in southwestern Orange is nicknamed the Orange Crush.
The Santa Ana Freeway is a bypass of the original state highway from Los Angeles to Santa Ana, which passed through Whittier and mostly became SR 72 in the 1964 renumbering. Southeast of Santa Ana, this earlier highway, added to the state highway system in 1910 as Route 2, generally followed the present freeway from Tustin past East Irvine to El Toro. This route was marked as part of US 101 in 1928.
In 1933, the state legislature added a number of routes to the state highway system, including two that later formed parts of the Santa Ana Freeway. Route 166 began at the new Route 172 (now SR 60), at the corner of Indiana and Third Streets, and headed south on Indiana Street and east and southeast on Mines Avenue (Olympic Boulevard) and Anaheim-Telegraph Road (now Telegraph Road) to Route 171 (now SR 39) at the intersection with Los Nietos Road near Santa Fe Springs. Route 174 began at Route 60 (then signed Alternate U. S. 101 now SR 1) in what now is known as Westchester and followed Manchester Avenue and Firestone Boulevard (then under construction alongside the Southern Pacific Railroad's Santa Ana Branch) to Route 2 (then Los Angeles Street, now Anaheim Boulevard) in southern Anaheim. A second piece began further southeast on Route 2, where it turned east on Chapman Avenue, and followed the shorter Santa Ana Boulevard diagonally to Route 2 (Main Street) in northern Santa Ana. In 1934, Route 166, except on Indiana Street, was marked as part of Sign Route 6 (which continued along Route 171 to Buena Park), and the entire length of Route 174 became Sign Route 10. (SR 6 was renumbered to SR 26 in 1937, when US 6 entered California; SR 10 was soon truncated to Anaheim Boulevard, as US 101 had moved from Route 2 to the shorter Route 174 in Santa Ana.)
A U.S. Route 101 Bypass was created by 1941, beginning at the intersection of Routes 166 (Indiana Street, soon moved to Downey Road) and 2 (US 101 along Whittier Boulevard), and following Routes 166 and 174 to Route 2 (US 101) in Anaheim. The connection between Routes 166 and 174 was made via Route 168 (Rosemead Boulevard, then and now SR 19). This resulted in SR 10 being truncated further, to the intersection of Firestone and Rosemead Boulevards, though SR 26 continued to extend east on Routes 166 and 171 to Buena Park.
A freeway connecting downtown Los Angeles with Orange County was planned by 1939, and was included in A Transit Program for the Los Angeles Metropolitan Area, published that year by the Metropolitan Transportation Engineering Board. To allow for its construction by the state, the definition of Route 166 was modified in 1941, changing the southeast end to Route 174 near Norwalk; at the same time, the northernmost piece was changed from Indiana Street to Downey Road.
The entire Santa Ana Freeway began construction in 1947 and completed in 1956. Originally it was signed as US 101 before the segment of 101 between the East Los Angeles Interchange and the United States–Mexico border in San Ysidro, California was decommissioned in favor of Interstate 5. It was approved as a chargeable interstate in 1961. The Santa Ana Freeway and also portions of San Diego Freeway (before the freeway was built) south of El Toro Y went up changing the U.S. 101 signs to Interstate 5 in 1964, including full length of Golden State Freeway which was originally signed as US 99.
From 1964 to 1968, the I-105 designation was used on a stretch of road linking I-5/I-10, US 101, and SR 10 (former I-110) north of downtown Los Angeles, now known as the East Los Angeles Interchange. In 1968, this I-105 was decommissioned, and that portion of the Santa Ana Freeway was folded into US 101.
Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see the list of postmile definitions). Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.
|Orange||Irvine||21.30||—||I-5 south (San Diego Freeway) – San Diego||Continuation beyond I-405|
|94A||I-405 north (San Diego Freeway north) to SR 133 south – Long Beach||Northbound exit and southbound entrance; south end of Santa Ana Freeway; south end of I-5 overlap|
|See I-5 Exits 94A–134|
|Los Angeles||Los Angeles||16.88
|—||I-5 north (Golden State Freeway) / I-10 – Sacramento, San Bernardino, Santa Monica||North end of I-5 overlap; south end of US 101 overlap; no access from I-5 north to US 101 north, and vice versa|
|See US 101 Exits 1–3|
|Los Angeles||Los Angeles||1.57||3||SR 110 to I-110 south (Harbor Freeway) / Grand Avenue – Pasadena, San Pedro||North end of Santa Ana Freeway; north end of US 101 overlap|
|—||US 101 north (Hollywood Freeway) – Ventura||Continuation beyond SR 110|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
Route map: Google
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