| State Route 121 | ||||
|---|---|---|---|---|
| Route information | ||||
| Defined by S&HC § 421 | ||||
| Maintained by Caltrans | ||||
| Length: | 33.567 mi[1] (54.02 km) | |||
| Major junctions | ||||
| South end: | SR 37 at Sears Point | |||
| SR 12 near Sonoma SR 29 in Napa |
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| North end: | SR 128 near Lake Berryessa | |||
| Highway system | ||||
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State highways in California(list • pre-1964)
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State Route 121 (SR 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.
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This route is part of the California Freeway and Expressway System[2] and is eligible for the State Scenic Highway System[3]. However, it is not a scenic highway as designated by Caltrans.[4]
The route begins at SR 37 in Sears Point. As it continues northward through Sonoma County, it meets SR 116. It then enters Schellville, where it begins a short overlap with SR 12. Upon leaving, it begins another overlap with SR 29, which happens to be a freeway, in Napa County. When it leaves, it continues northward and meets SR 221 in Napa. As it leaves the city, it continues northward for several miles before reaching its north end at SR 128.
The section from SR 37 to SR 29 in Napa remains virtually unchanged since its definition in 1963. The northern section, however, was slightly altered since its definition the same year due to a realignment of various other freeways.[5]
| County | Location | Postmile [6][7] |
Destinations | Notes |
|---|---|---|---|---|
| Sonoma SON 0.00-11.62 |
Sears Point | 0.00 | SR 37 – Vallejo, Novato | |
| 6.69 | SR 116 west (Arnold Drive) / Bonneau Road – Glen Ellen, Petaluma | |||
| Schellville | 7.44 | SR 12 west (Broadway) – Sonoma, Boyes Hot Springs, Glen Ellen | South end of SR 12 overlap | |
| R10.79 | Napa Road | |||
| Napa NAP 0.00-22.08 |
Napa | R4.47 R8.66[N 1] |
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 | ||||
| R10.30[N 1] 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 | |||
| 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 | |||
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Concurrency terminus • Closed/Former • Incomplete access • Unopened |
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