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The Siskiyou Mountains form the watershed boundary between the Klamath and Rogue Rivers and are also a rough natural separator between Oregon and California. The summit on Interstate 5 is about 12 miles (19 km) south of Ashland, Oregon, 25 miles (40 km) north of Yreka, California, and 0.5 miles (0.80 km) east of the historical Siskiyou Pass, the most used mountain pass in the state. [2]
The pass is situated in Jackson County on the road and rail transport link between Oregon and California.It measures 4,129 feet (1,259 m) above MSL.Situated along Oregon Route 273 (also known as Old Highway 99), it is 5 miles (8.0 km) north of California state boundary, and 0.5 miles (0.80 km) west of the I-5 summit feature, Siskiyou Summit.
Siskiyou Peak: 1156842: Clatskanie Hill Summit: 760 ft (230 m) Clatskanie Hill: 1156842: Clatsop Crest Summit ... Siskiyou Pass: 1127005: Siskiyou Summit: 4,310 ft ...
Siskiyou Summit is the highest pass on Interstate 5, at 4,310 feet (1,310 m). This pass is one of the most treacherous in the Interstate highway system. The California side has a more gradual slope than the Oregon side, where the freeway climbs or descends 2,300 feet (700 m) in elevation over about 7 miles (11 km).
Aerial view of Interstate 5 in downtown Medford, where it travels on an elevated viaduct. I-5 enters Oregon at the California state line in southern Jackson County.The highway travels northeast along a ridge in the Siskiyou Mountains, with a maximum grade of 6 percent, to Siskiyou Summit; [12] at 4,310 feet (1,310 m), it is the highest point on all of I-5 and one of the highest points on the ...
Finally, it is an important alternate route for traffic moving up and down the West Coast, as bad weather frequently closes Interstate 5 at the Siskiyou Summit during the winter. The Union Pacific Railroad I-5 Corridor main line through Oregon and California roughly follows OR 58 and US 97. While a rail line exists through Siskiyou Summit, it ...
As it approaches the summit, the Middle Fork Smith River turns east, but US 199 continues northeast, following Griffin Creek to near its source (where there is a rest area), and passing under Hazel View Summit, the border between the Smith River NRA and the Rogue River-Siskiyou National Forest, in the 1963 Collier Tunnel (elevation about 2,100 ...
OR 273 is known as the Siskiyou Highway No. 273 (see Oregon highways and routes). It is 12.42 miles (19.99 km) long and runs north–south parallel of I-5, entirely within Jackson County . OR 273 was established in 2003 as part of Oregon's project to assign route numbers to highways that previously were not assigned.