Ultimate Interstates:West Coast

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California and Nevada would see a number of interstate improvements. The map below shows these various improvements. Solid Blue Lines indicate new free and purple indicates toll interstate routes. Dotted lines show additional Proposed routes or alternative routes. Red and Green (toll) lines show existing Interstate highways. Click on a shaded region below to view more detailed information about interstate ideas for that area

Corridor 1

Ultimate Interstate 1 is an interstate highway corridor that travels up the California Coastline from Los Angeles to San Francisco. This route could also be extended northward along the Oregon and Washington coastline to Olympia, WA.

The route would largely replace US 101 throughout most of the state. However through the bay area it would replace I-880 along the east bay and cross using the San Rafael bridge (I-580) which is where it would route back over to back to the US-101 alignment northward.

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Corridor 9

This Central California interstate would replace existing SR-99 throughout most of the state of California. Traveling from Red Bluff to Mettler via Chico along existing SR-99 the route then switched to SR-70 through Oroville and Marysville before rejoining SR-99 near Nicolaus, the route then continues along I-5 through Sacramento, and then along SR-99 through the cities of Modesto, Fresno, and Bakersfield.

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Corridor 11

Originating from Gila Bend, Arizona I-11 travels north into Nevada crossing the new Colorado River Bridge near the Hoover Dam. This interstate would replace existing US-93 and I-515 south of Las Vegas. North of Las Vegas the route will generally follow US-95 northward throughout the state north through Fallon. I-11 would be cosigned with I-80 from Fallon Junction to Winnemucca before continuing north along US-95 into Oregon. Eventually the route continues north toward Boise and Lewiston eventually ending in Spokane.

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I-40 Extension

This plan would extend I-40 from its existing terminus in Barstow, CA westward along CA-52 through Bakersfield to I-5. Then head west following CA-46 over to the coast ending at US-101/Corridor 1 in Paso Robles. This would also complete a missing link in the Interstate system and connect the lower central valley to the interstate system.

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I-70 Extension

From its existing terminus in Utah, this interstate would generally follow existing US-50/6 route to Ely. From there the interstate would continue west along one of two possible routes. From Ely the northern route follows along US-50 to Fallon and then ends in Fernley terminating at I-80. The southern route would generally follow US-6 toward Tonopah and Bishop connecting to I-11 and ending at I-9 where at some point it could be extended westward into California as a second interstate route to the California Central valley and Bay Area region.

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High Desert Conceptual Corridor

This is a conceptual corridor following along sections of CA-14; US-395 and US-6. exact routing and interstate number designations with this route are to be determined. The route would essentially build two sections of interstate highway. One from Newhall Pass (Santa Clarita) to Coaldale NV ending at Ultimate Interstate:Corridor 11, and another segment from Tonopah, NV to Ely, NV connecting to a possible westward extension of I-40

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Bay Area

This proposal would renumber several bay area freeways as auxiliary interstate routes based on the planned I-1 and I-9 corridors and involve the upgrade and construction of a few key corridors for future growth and interregional travel, including one new auxiliary interstate in the Sacramento Area.

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Southern California

This proposal would renumber several southern california freeways as interstates and involve the upgrade and construction of a few key corridors for future growth and cross border commerce with Mexico.

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