California State Route 121
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| State Route 121 | |||||||||||||
| Defined by S&HC § 421, maintained by Caltrans | |||||||||||||
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| Length: | 33.567 mi[1] (54.02 km) | ||||||||||||
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| South end: |  SR 37 at Sears Point |
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| Major junctions: |
 SR 12 near Sonoma SR 29 in Napa |
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| North end: |  SR 128 near Lake Berryessa |
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State Route 121 is a California state highway in the Wine Country that runs northerly from its junction with State Route 37 at Sears Point, past the Tolay Lake basin and across Tolay Creek near Infineon Raceway, veers east at a junction with State Route 116 and Bonneau Road at Schellville, runs eastward through the Carneros region of the southern Sonoma Valley and Napa Valley (concurrent first with State Route 12, then with State Route 29), then northeastward to end near Lake Berryessa in Napa County.
The California Legislature named the route "Carneros Highway" from its southern terminus to its junction with route 29 in Napa. The stretch between the junctions with route 116 and Napa Road near the Sonoma/Napa county line is known locally as "Fremont Drive." Addresses along the stretch between routes 37 and 116 sometimes use the postal address "Arnold Drive," even though that name officially applies only to the county road north of 116.
This route is part of the California Freeway and Expressway System[2] and is eligible for the State Scenic Highway System[3].
[edit] Major intersections
- Note: Except where prefixed with a letter, postmiles were measured in 1964, based on the alignment as it existed at that time, and do not necessarily reflect current mileage. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.
| County | Location | Postmile [4][5] |
Destinations | Notes |
|---|---|---|---|---|
| Sonoma SON 0.00-11.62 |
Sears Point | 0.00 | SR 37 – Vallejo, San Francisco |
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| 6.69 |  SR 116 west (Arnold Drive) / Bonneau Road – Glen Ellen, Petaluma |
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| 7.44 | SR 12 west (Broadway) – Sonoma, Boyes Hot Springs |
South end of SR 12 overlap | ||
| R10.79 | Napa Road, Leveroni Road | |||
| Napa NAP 0.00-22.08 |
Napa | R4.46 29 R8.66 |
SR 29 south / SR 12 east – American Canyon, Vallejo, Fairfield |
North end of SR 12 overlap; south end of SR 29 overlap |
| South end of freeway on SR 29 | ||||
| North end of freeway on SR 29 | ||||
| 29 R10.30 R4.47 |
SR 29 north / Imola Avenue west – Calistoga |
Interchange; north end of SR 29 overlap | ||
| 6.01 |  SR 221 south (Soscol Avenue south) / Imola Avenue east – Vallejo |
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| 6.55 | Soscol Avenue north – Downtown Napa | |||
| 9.40 | Silverado Trail, Trancas Street | |||
| 16.07 | Wooden Valley Road – Fairfield | |||
| 22.08 | SR 128 – Winters, Lake Berryessa, Rutherford |
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[edit] References
- ^ California Department of Transportation, State Truck Route List (XLS file), accessed February 2008
- ^ CA Codes (shc:250-257)
- ^ CA Codes (shc:260-284)
- ^ California Department of Transportation, Log of Bridges on State Highways, April 2008
- ^ California Department of Transportation, All Traffic Volumes on CSHS, 2007
[edit] External links
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