ULTIMATE INTERSTATES

NORTHERN CALIFORNIA



GENERAL INFORMATION & MAP

Northern California 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

Interstate 201 - San Jose Bypass
Description This Would replace the existing SR 85 freeway that loops around the San Jose Area. Click Here to see a more detailed map of this route
Purpose and Need To promote continuity with the existing interstate system.
Notes This route could also be looped back along the SR-84 (Dumbarton Bridge) to Fremont to complete the loop.
Interstate 205 Extension
Description This Would replace existing SR 120 between I-5 and I-7 (SR 99) with an extension of existing Interstate 205. The highway would be cosigned a short distance along I-5. Click Here to see a more detailed map of this route
Purpose and Need Improved Connectivity to the interstate system.
Interstate 207 - Valley to Bay Spur
Description This Would replace existing SR 4 between I-80 near Rodeo CA and I-7 (SR 99) near Stockton CA with an Interstate 207.
Purpose and Need Improved Connectivity to the interstate system.
Interstate 301 - Southbay Freeway
Description This Would replace the existing SR 237 freeway around the north side San Jose Area from Mountain View to Milpitas. Click Here to see a more detailed map of this route
Purpose and Need To promote continuity with the existing interstate system.
Notes This route could also be extended east to I-680 but due to large right of way aquisitions needed this would likely never happen.
Interstate 401 - San Mateo Freeway/Toll Bridge
Description This Would replace the existing SR 92 freeway crosses the San Mateo bridge. Traveling from I-280 southwest of San Mateo to I-880 near Hayward. Click Here to see a more detailed map of this route
Purpose and Need To promote continuity with the existing interstate system.
Notes This route could also be extended northeastward through Hayward to connect to I-580 but due to large right of way aquisitions needed this would likely never happen.
Interstate 480 - Capital City Freeway - Sacramento
Description This Would replace a portion of US-50 and the existing SR 51 (Business 80) freeway that loops around downtown and midtowm Sacramento. Click Here to see a more detailed map of this route.
Purpose and Need To promote continuity with the existing interstate system. And make final upgrades to interstate standards along SR-51 (Business 80).
Notes This route could also be cosigned with I-7 for a short distance from the I-5 interchange to the US50 and Capital City Freeway east interchange.
Interstate 701 Spur - Santa Cruz
Description This Would replace the existing SR 17 freeway from I-280 to SR 1 in Santa Cruz serving as an interstate spur to Santa Cruz. Click Here and see map below for a visual of this route.
Purpose and Need Connectivity to the existing interstate system and upgrading a highly traveled corridor to freeway standards.
Notes This route could also be extended southward along existing SR-1 to connect with the future I-901 spur to Monterey.
Interstate 801 - Northbay Freeway
Description This Would replace existing SR 37 from US-101(I-1) in Novato to I-80 in Vallejo.
Purpose and Need To promote continuity with the interstate system. and upgrading the SR 37 corridor to freeway standards.
Interstate 807 - Sacramento Metro
Description This Would replace existing SR 65 from I-7 (SR-70) near Olivehurst to I-80 near Roseville.
Purpose and Need To promote continuity with the interstate system. and upgrading the SR 65 corridor to freeway standards.
Notes Depending upon the final routing of parent Interstate 7 This route could also be swapped with to I-7 along the SR-70 corridor which travels due south from Olivehurst to North Natomas. This is likely if I-7 were to be routed along the Capital City Freeway (SR-51) northeast to Roseville and thentravel along the SR 65 corridor instead.
Interstate 901 Spur - Monterey Bay
Description This Would replace existing SR 156 and be cosigned along the SR-1 freeway from Castroville to Monterey (at the SR-68 junction) freeway from I-280 to SR 1 in Santa Cruz serving as an interstate spur to Monterey. See map below for a visual this route.
Purpose and Need Connectivity to the interstate system and upgrading the SR 156 section of the corridor to freeway standards.
Interstate 980 Extension and Bay Area Toll Road
Segment 1 Oakland to Walnut Creek (see note 1) - This Would replace the existing SR 24 freeway from I-980/580 interchange in Oakland, east to I-680 in Walnut Creek. Click Here and see map below for a visual of this route.
Segment 2 Walnut Creek to Bay Point (see note 1) - This Would Run Cosigned with I-680 from the SR-24 interchange north to SR 242 in Concord. From there it would replace SR 242 and then run Cosigned from there with I-207 (or SR 4) to Bay point or Antioch depending which routing is chosen. From there I 980 would continue northeast on Segment 3 (or 3A). Click Here and see map below for a visual of this route.
Segment 3 Baypoint to I-5 near Hood CA - Via Antioch CA (see note 2)This Would replace the existing SR 160 highway and also be partially built on a new alignment generally following the Sacramento river northeastward to I-5 near Hood CA.
Segment 3A Baypoint to I-5 near Hood CA - Via new western route (see note 3)This Would construct a new bridge crossing west of Baypoint then near the suisun Bay. After crossing the delta channel the highway turns northeast heading towards and then west of rio Vista before heading to Hood and I-5 south of Laguna and Elk Grove Click Here and see map below for a visual of this route.
Segment 4 I-5 near Hood CA to I-80 near Auburn CAThis Would construct a new freeway along a new alignment running eastward to the south of Laguna and Elk Grove to I-7 (SR-99). From there it turns notrheastward Generally following Grant Line Rd until it reaches US-50 near El Dorado Hills It would then turn northward and travel around the east side of Folsom Lake and connect to I-80 near Auburn CA. See map below for a visual of this route.
Purpose and Need Segment 1: To upgrade SR-24 to interstate standards. Segments 2-4: To provide an additional direct route to the bay area for travelers from the Sacramento Metro and Reno-Tahoe Metro Areas.
Notes 1. I-980 could end at I-680/SR24 interchange and the Bay Toll Road portion could be signed as I-407 instead.

2. If segments 3 and 4 are signed as I-407 instead of being an extension of I-980 then segment 2 is not needed and I-407 would have its southern terminous at Antioch. this is more likely to happen if the Via Antioch routing is chosen.

3. If segments 3 and 4 are signed as I-407 instead of being an extension of I-980 then segment 2 is not needed and I-407 would have its southern terminous at Bay Point. Since concurrencies are shortthen it makes sense to use I-980 instead of I-407.