![]() ![]() In places, the median is over 1.5 mi (2.4 km) wide. At the Mountain Springs/In-Ko-Pah grade, the freeway is routed down two separate canyons- Devils Canyon for westbound traffic and In-Ko-Pah Gorge for eastbound traffic-as it descends 3,000 ft (910 m) in 11 mi (18 km). I-8 straddles the San Diego– Imperial county line for a few miles before turning east. In Boulevard, I-8 has an interchange with the eastern end of SR 94. The freeway intersects with SR 79 in the national forest before passing through the La Posta and Campo Indian reservations. However, this resulted in smugglers driving the wrong way on I-8 at high speeds in order to avoid the checkpoint, causing several crashes, even after concrete barriers were installed. border patrol interior checkpoint that was constructed in 1995 near Buckman Springs Road turnoff just east of the summit. This route achieves four 4,000-foot (1219.2 meters) high points at Carpenter Summit, then crosses the Pine Valley Creek Bridge before the Laguna Summit, followed by the Crestwood Summit, then the Tecate Divide, After the Laguna Summit, the road passes a U.S. From Mission Valley through El Cajon, it is paralleled by the San Diego Trolley Green Line.Įast of El Cajon, it ascends into the mountains and the Cleveland National Forest, traveling through towns such as Alpine then going by the Viejas Casino before reaching Pine Valley. In La Mesa, the route intersects SR 125, and in El Cajon it intersects with SR 67. I-8 then has interchanges with SR 163, I-805, and I-15. ![]() As the freeway enters Mission Valley, it continues eastward, bisecting the area known as "Hotel Circle" that has several hotels. Near Old Town San Diego, I-8 intersects with I-5 as well as with Rosecrans Avenue, the former routing of SR 209. ![]() For its first few miles, it parallels the San Diego River floodway. The freeway begins at the intersection of Sunset Cliffs Boulevard and Nimitz Boulevard in San Diego. The freeway from the eastern junction with California State Route 98 (SR 98) to the eastern end is designated as part of the Juan Bautista de Anza National Historic Trail auto tour route, promoted by the National Park Service. I-8 is part of the National Highway System, a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration. ![]() Since then, the freeway through San Diego has been widened due to increasing congestion, and another portion in Imperial County had to be rebuilt following damage by the remnants of Hurricane Kathleen. The route was completed in 1975 through California, and by 1977 through Arizona, though the bridge over the Colorado River was not completed until 1978. House of Representatives subcommittee found that the Arizona government had mismanaged financial resources. Several controversies erupted during the construction process questionable labor practices in Imperial County led to the federal conviction of mobster Jimmy Fratianno, and a U.S. The Arizona portion of the road was built starting in the 1960s. The US 80 freeway through San Diego was largely complete by the time it was renumbered as I-8 in the 1964 state highway renumbering east of San Diego, the US 80 roadway was slowly replaced by I-8 as construction progressed in the Imperial Valley. Route 80 (US 80) across California and part of Arizona, and Arizona State Route 84 (SR 84) between Gila Bend and Casa Grande. The first route over the Cuyamaca Mountains was dedicated in 1912, and a plank road served as the first road across the Imperial Valley to Yuma east of there, the Gila Trail continued east to Gila Bend. Crossing the Colorado River into Arizona, I-8 continues through the city of Yuma across the Sonoran Desert to Casa Grande, in between the cities of Phoenix and Tucson. In California, the freeway travels through the San Diego metropolitan area as the Ocean Beach Freeway and the Mission Valley Freeway before traversing the Cuyamaca Mountains and providing access through the Imperial Valley, including the city of El Centro. It runs from the southern edge of Mission Bay at Sunset Cliffs Boulevard in San Diego, California, almost at the Pacific Ocean, to the junction with I-10, just southeast of Casa Grande, Arizona. Interstate 8 ( I-8) is an Interstate Highway in the southwestern United States. I-8 in San Diego, from the San Diego Trolley ![]()
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