From Wikipedia, the free encyclopedia Jump to: navigation, search"I-5" redirects here. For other uses, see I5 (disambiguation).For the Wedding Present song, see Interstate 5 (The Wedding Present song).

Route information
Length: 1,381.29 mi[1] (2,222.97 km)

1957[citation needed] – present

2011 - Present (2nd Version)

Major junctions
South end: MX 1 at Mexican border in San Diego, CA
I-8 in San Diego, CA Interstate 10 in Los Angeles, CA Interstate 80 in Sacramento, CA Interstate 84 in Portland, OR [[Interstate in Seattle, WA

North end:

West End's

East End

BC 99 at Canadian border in Blaine, WA

US 199 in Crescent City, CA

US 101 in Eureka, CA

US 101 / SR 20 in Ukiah, CA

SR 116 in Santa Rosa, CA

I-580 in San Rafael, CA

i-680 / US 101 in San Jose, CA

US 101 in Ventura, CA

I-180 in Eureka, CA / Myrtletown, CA/ San Antonio, CA

Highway system

Main route of the Interstate Highway System {C MainAuxiliaryBusiness

Interstate 5 (I-5) is the main Interstate Highway on the West Coast of the United States, largely parallel to the Pacific Ocean from Canada to Mexico (Washington to southernmost California, linking Baja California to British Columbia) and serving some of the largest cities of that part of the U.S., including Seattle, Tacoma, Portland, Sacramento, San Francisco/Oakland, Los Angeles, and San Diego. It links the state capital cities of Washington, Oregon, and California. Its southern end is at the United States - Mexico border. Its northern end is at the Canada-United States border Interstate 5 is the only Interstate Highway to touch both the Canadian and Mexican borders. At its southern end, I-5 continues into Tijuana, Mexico, as Mexico Federal Highway 1 At its northern end, I-5 continues into Vancouver, British Columbia Canada, as British Columbia Highway 99

This highway links to control cities in California (San Diego, Santa Ana, Los Angeles, Oakland, San Francisco, Sacramento, Redding, Mount Shasta, Weed, and Yreka), Oregon (Ashland, Medford, Grants Pass, Roseburg, Eugene, Salem, and Portland), and Washington (Tacoma, Seattle, Everett, Mount Vernon, Bellingham). Vancouver, British Columbia (signed as "Vancouver B.C." to avoid confusion with Vancouver, Washington) is also a control city on Interstate 5 from the Seattle-Tacoma area to the northern terminus at the Canadian border.

One notable control city not directly linked by this highway is San Francisco, which is about 80 miles (130 km) west of I-5. To the south, Interstate 580 splits from I-5 towards San Francisco, while, to the north, Interstate 505 cuts south to Interstate 80, which serves that city. That routing, via I-580, I-80 and I-505, was planned originally as Interstate 5W.[2][3]


[hide]*1 Route description

    • 1.1 California
    • 1.2 Oregon
    • 1.3 Washington
  • 2 History
  • 3 Major intersections
  • 4 Auxiliary routes
  • 5 References

Interstate 5Edit

mi[1] km
CA 796.53 1281.89
OR 308.14 495.90
WA 276.62 445.18
Total 1381.29 2222.97


Main article: Interstate 5 in California The most southerly point of Interstate 5 is at the United States-Mexico border at the San Ysidro border crossing, one of the busiest in the world.[4] Beginning at the border in San Ysidro, which is part of the city of San Diego, as the John J. Montgomery Freeway, I-5 goes through the suburbs of National City and Chula Vista before reaching downtown San Diego. It then parallels the Pacific coastline, going through the northern suburbs of San Diego, bisecting the University of California, San Diego campus, and passing the I-805 merge, before passing through the 28 miles (45 km) of Marine Corps Base Camp Pendleton in northern San Diego County. Here I-5 is also known as the San Diego Freeway.

At Dana Point, I-5 turns inland and heads due north through Mission Viejo to the El Toro Y interchange in southeastern Irvine. I-5 becomes the Santa Ana Freeway as it runs southeast to northwest, passing through major cities and suburbs in Orange and Southern Los Angeles counties. Southern Californians refer to it as "the 5 Freeway" or as the Santa Ana Freeway in the Los Angeles area. From this point, the San Diego Freeway continues northward as I-405.

When the freeway reaches the East Los Angeles Interchange one mile (1.6 km) east of downtown Los Angeles, I-5 becomes the Golden State Freeway. The route continues through the San Fernando Valley and then crosses the Newhall Pass through the Santa Susana Mountains into the Santa Clarita Valley. For about a four-mile (6 km) stretch between Santa Clarita Valley and the Pyramid Lake, the northbound and southbound lanes separate and cross sides, with the southbound lanes running to the east of the northbound ones. At that point, the Golden State Freeway rises sharply to the north through the Grapevine to eventually reach the second-highest point of its entire length, the Tejon Pass (elevation 4,183 ft (1,275 m)). through the Tehachap Mountains. Path 26 power lines generally follow the freeway along this stretch. The freeway then descends sharply for 12 miles (19 km) at Tejon Pass to around 1,600 feet (490 m) at Grapevine near the southernmost point of the San Joaquin Valley, approximately 30 mi (48 km) south of Bakersfield and 4 mi (6 km) south from where State Route 99 splits away from it in Wheeler Ridge. {C Enlarge I-5 south approaching Weed and Mt. Shasta .From Highway 99 to south of Tracy, I-5 skirts along the far more remote western edge of the great Central Valley, and thus here is removed from population centers such as Bakersfield and Fresno; other state highways provide these connections. Interstate 580 splits off from I-5 at a point south of Tracy, providing a loop-route connection to the San Francisco Bay Area. After passing Tracy, I-5 heads north through Stockton and Sacramento before turning west to Woodland. At Woodland, the interstate heads northwest again towards Dunnigan, where it converges with Interstate 505

From Dunnigan, I-5 skirts north along the western edge of the Sacramento Valley to Red Bluff I-5 then enters the Shasta Cascade region, passing through Redding and Shasta Lake before climbing up to near the foot of Mount Shasta. The interstate then travels to Weed and Yreka before reaching the Oregon border.


Main article: Interstate 5 in Oregon About 3 mi (5 km) north of the California border, the highway crosses 4,310 feet (1,310 m) Siskiyou Summit, the highest point on I-5, and then drops down into the Rogue River Valley through Oregon's southern mountains and towns such as Ashland, Medford and Grants Pass. Turning north across three passes to the Umpqua Valley and through Roseburg, the mountains tend to turn into hills, and as it reaches Cottage Grove, the road enters the Willamette River Valley. At Eugene the highway intersects Interstate 105, a short spur route into Downtown Eugene. Some city highways intersect on I-5 in the Eugene Metro. The interstate then heads almost due north, skirting Albany and Corvallis, passing through Salem, and crossing through Woodburn. There were plans to build a spur, called Interstate 305, into Salem. I-5 covers 308 miles (496 km) in Oregon. In downtown Portland, I-5 runs adjacent to the Willamette River and passes by the Rose Garden Arena (center), and Oregon Convention Center (right).Just north of Salem, between mile marks 259 and 260, a sign in the median marks the place where the 45th parallel crosses I-5. It reads "45 Parallel half way between the Equator and the North Pole".

The highway then tracks a little to the northeast, and Interstate 205 splits off south of the Portland metro area. From here I-5 passes through Tualatin and Tigard along former U.S. Route 99W before hitting the southern terminus of I-405 and the Marquam Bridge. Also planned was a spur in Portland off I-405, called Interstate 505, but it was never built and has been removed from city plans. A stub of I-505 exists as a long exit ramp to U.S. Route 30.


After crossing the Willamette River on the Marquam Bridge, I-5 has junctions at the western end of Interstate 84 and the northern end of I-405. It then continues through the northern parts of the city of Portland, and crosses into Washington I-5 bridge over the Nisqually River, near Interstate 5 passing through downtown Seattle.===[[[Interstate 5|edit]]] Washington=== Main article: Interstate 5 in Washington The highway begins in Washington over the Columbia River and drops down into the city of Vancouver. About seven miles (11 km) into the state, it reaches the northern terminus of I-205, which is on the eastern edge of the Portland-Vancouver metropolitan area. It then tracks north by northwest to Kelso and Longview, at which point it ceases paralleling a large bend of the Columbia. Continuing north through the Willapa Hills, the freeway eventually reaches Olympia, where it bends sharply east, after that it goes through Fort Lewis and byMcChord AFB, then finally Tacoma where it bends sharply north again to reach Seattle. The Ship Canal Bridge carries it over Portage Bay in Seattle. The freeway makes its way out of the Seattle/Tacoma/Everett metro area, crosses the floodplains of three rivers, through the Skagit Valley and the Mount Vernon-Burlington Metropolitan Area to the northern city of Bellingham to arrive at the Peace Arch Canadian border crossing between Blaine, Washington, and Surrey, British Columbia. Highway 99 continues northwest from the border into Vancouver, B.C. I-5 covers 277 miles (446 km) in Washington.


An extensive section of this highway (over 600 miles (970 km)), from approximately Stockton, California, to Portland, Oregon, follows very closely the track of the Siskiyou Trail.[5] This trail was based on an ancient network of Native American footpaths connecting the Pacific Northwest with California's Central Valley. By the 1820s, trappers from the Hudson's Bay Company were the first non-Native Americans to use the route of today's I-5 to move between today's Washington State and California. During the second half of the 19th century, mule trains, stagecoaches, and the Central Pacific railroad also followed the route of the Siskiyou Trail.[5] By the early 20th century, pioneering automobile roads were built along the path of the Siskiyou Trail, notably the Pacific Highway. The Pacific Highway ran from British Columbia to San Diego, California, and was the immediate predecessor of much of U.S. Route 99. The route of U.S. 99 was in turn used as a basis for much of the route of today's I-5.

A major deviation from the old U.S. 99 route is the Westside Freeway portion of I-5 in California's Central Valley. To provide a faster and more direct north-south route through the state, the decision was made to build a new freeway to the west and bypass Fresno, Bakersfield, and the rest of population centers in the area instead of upgrading the existing highway (which was re-designated as part of California State Route 99).[6]

Major intersectionsEdit

EnlargeLooking South at Interstate 5 and Interstate 90 meeting in Seattle, Washington.*Interstate 805 (bypass) in south San Diego, California [Exit 1A]

ass) in Tukwila, Washington (southern junction) [Exit 154A]

I-5 will have a complete set of auxiliary routes (105, 205, 305, 405, 505, 605, 705, 805, 905), with the completion of Interstate 905 in San Diego. Currently, Interstate 80 and Interstate 90 are the only two interstates to have complete sets of auxiliary routes, by the numbers.