California State Route 20

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Source: Wikipedia, the free encyclopedia.
"CA 20" redirects here. For the congressional district, see California's 20th congressional district.

Yuba-Donner Scenic Byway
RestrictionsNo hazardous material along the northeast shore of Clear Lake between SR 29 and SR 53[2]
Major junctions
West end SR 1 in Fort Bragg
Major intersections
East end I-80 near Emigrant Gap
Location
CountryUnited States
StateCalifornia
CountiesMendocino, Lake, Colusa, Sutter, Yuba, Nevada, Placer
Highway system
← SR 19→ SR 22

State Route 20 (SR 20) is a state highway in the northern-central region of the U.S. state of California, running east–west north of Sacramento from the North Coast to the Sierra Nevada. Its west end is at SR 1 in Fort Bragg, from where it heads east past Clear Lake, Colusa, Yuba City, Marysville and Nevada City to I-80 near Emigrant Gap, where eastbound traffic can continue on other routes to Lake Tahoe or Nevada.

Portions of SR 20 are built near the routing of what was first a

freeway
standards.

Route description

State Route 20 begins at

Salt Creek.[3]

SR 20 in the Sacramento Valley

Once it enters the flat Sacramento Valley, SR 20 takes a generally straight path, crossing

Sutter Bypass on its way to Yuba City. The route crosses SR 99 west of central Yuba City, and runs east through northern Yuba City to the Feather River, which it crosses on the 10th Street Bridge into Marysville. Within the central part of that city, SR 20 makes several turns, first turning south from 10th Street onto E Street, then east on 9th Street (overlapping SR 70), north on B Street, and east on 12th Street (splitting from SR 70). The highway leaves Marysville to the northeast, paralleling the Yuba River on its north side as it enters the foothills of the Sierra Nevada.[3]

SR 20 rises into the Sierra along the north side of the Yuba River, crossing to the south side near

National Recreation Trail, parallels SR 20 from a point on Harmony Ridge to the Bear Valley, and includes parts of a branch of the California Trail first used in 1850.[4]

SR 20 east of US 101 is part of the

Yuba-Donner Scenic Byway, a National Forest Scenic Byway that uses SR 20 east of SR 49.[13]

History

Marker along SR 20
Donner Summit
near the eastern terminus of SR 20

The east end of SR 20, from Bear Valley (just below Emigrant Gap) to Nevada City, closely follows a branch of the Truckee Route of the California Trail, first used by California-bound emigrants in 1850.[4] Later a turnpike was built here by the same company that opened the Pacific Turnpike (Culbertson Road and Bowman Lake Road between Dutch Flat and Bowman Lake) in 1864.[14]

By the end of the 1910s, a passable

Route 7, now I-5) with the county seat of Colusa.[17]

This state highway was significantly extended in both directions in 1919, west to Ukiah and east to Emigrant Gap,

Route 50, now SR 53 and SR 16) east to Wilbur Springs.[20][21] With the completion of this segment in mid-1932, the highway was ready for heavy travel,[22] and became Sign Route 20 in 1934 as part of the initial signed state route system.[23]

In 1953, the legislature added an extension of Route 15 from US 101 at Willits (north of Ukiah) west to SR 1 near Fort Bragg.

county road[25]) and became part of Sign Route 20 prior to 1964,[26] when the Route 20 designation was legislatively adopted.[27] Subsequent improvements include the construction of the Golden Center Freeway, connecting Grass Valley with Nevada City, in the late 1960s, and a new alignment of SR 20 west from Grass Valley, bypassing Rough and Ready, in the mid-1980s.[28]

Major intersections

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage. R reflects a realignment in the route since then, M indicates a second realignment, L refers to an overlap due to a correction or change, and T indicates postmiles classified as temporary (for a full list of prefixes, see California postmile § Official postmile definitions).[1] Segments that remain unconstructed or have been relinquished to local control may be omitted. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.

CountyLocationPostmile
[1][28][29]		Exit
[30][31]		DestinationsNotes
Mendocino
MEN R0.00-44.11		Fort BraggR0.00 SR 1 (Shoreline Highway) – Caspar, Fort BraggWestern terminus
​33.217
 US 101 north – Eureka		West end of US 101 overlap; US 101 exit 568
West end of freeway on US 101
​R32.63[N 1]557West Road – Redwood ValleyExit number follows US 101
​​East end of freeway on US 101
​41.06[N 1][32]Ridgewood Summit
​​West end of freeway on US 101
Calpella30.83[N 1]
33.22		East end of freeway on US 101
Trumpet interchange
; east end of US 101 overlap; US 101 exit 555B
​33.77Road 230 – Redwood ValleyInterchange via connector road; serves Redwood Valley Rancheria
Lake
LAK 0.00-46.48		Upper Lake8.32
 SR 29 south – Lakeport, Kelseyville		Roundabout; serves Sutter Lakeside Hospital
​31.62 SR 53 – City of Clearlake, Lower Lake, LakeportRoundabout
Wilbur Springs
3.45
 SR 16 east – Woodland
WilliamsT20.56

 SR 20 Bus. east (E Street)
R21.85
US 99W
R22.12 I-5 – Redding, SacramentoI-5 exit 578
T23.19

 SR 20 Bus. west (Husted Road)
Colusa31.09
 SR 45 north (Market Street west) – Princeton		West end of SR 45 overlap
​36.79
 SR 45 south / Steidlmayer Road – Grimes		East end of SR 45 overlap
Sacramento River39.34
0.00		Meridian Bridge
Sutter
SUT R0.00-17.06		Yuba City15.57 SR 99 – Chico, Sacramento
16.84Sutter Street / 2nd StreetInterchange; 2nd Street not signed westbound
Feather River17.06
0.00		10th Street Bridge
Yuba
YUB 0.00-21.67		Marysville​I StreetRight-in/right-out interchange; eastbound exit and entrance
0.99
US 99E
south
1.47
 SR 70 north (B Street north) – Oroville		East end of SR 70 overlap
At-grade intersection
; west end of Eric W. Rood Memorial Expressway
Grass ValleyR12.16—McCourtney Road / Mill StreetMcCourtney Road not signed westbound
R12.24East end of Eric W. Rood Memorial Expressway
R12.24–
R12.30
 SR 49 south / Empire Street east – Auburn		Signalized interchange; west end of SR 49 overlap
R12.30West end of freeway
R12.92182A SR 174 – Colfax, Grass Valley
R13.61182BIdaho Maryland RoadEastbound signage
E. Main StreetWestbound signage
R14.27183ADorsey Drive
R14.80183BBrunswick Road
Nevada CityR15.92185AGold Flat Road / Ridge RoadSigned as exit 185 westbound
R16.74185BSacramento Street – Nevada CityEastbound exit and westbound entrance
R16.99186Broad StreetEastbound exit and westbound entrance
R17.24Coyote Street – Historical DistrictNo eastbound exit
East end of freeway
R17.40
 SR 49 north / Uren Street – Downieville		East end of SR 49 overlap
Placer
PLA 41.287-43.87		Bear River41.29Bridge
Nevada
NEV 43.87-45.66		​45.66 I-80 – Reno, SacramentoEastern terminus; I-80 exit 161
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  1. ^ a b c Indicates that the postmile represents the distance along US 101 rather than SR 20.

See also

  • sign 
    California Roads portal

References

  1. ^ a b c California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on June 30, 2015. Retrieved June 30, 2015.
  2. ^ "Special Route Restrictions". Caltrans. Retrieved July 28, 2014.
  3. ^
    USGS topographic maps, accessed January 2008 via ACME Mapper
  4. ^
    U.S. Forest Service, Pioneer Trail
    , revised May 2006
  5. ^ "Article 2 of Chapter 2 of Division 1". California Streets and Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
  6. ^ Federal Highway Administration (March 25, 2015). National Highway System: California (North) (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved October 19, 2017.
  7. ^ Natzke, Stefan; Neathery, Mike & Adderly, Kevin (June 20, 2012). "What is the National Highway System?". National Highway System. Washington, DC: Federal Highway Administration. Retrieved July 1, 2012.
  8. ^ California State Legislature, CA Codes (shc:163-164.56) Archived 2009-05-01 at the Wayback Machine, accessed March 2008
  9. ^ California Department of Transportation, High Emphasis Routes, January 2005
  10. ^ California Department of Transportation, Focus Routes, January 2005
  11. ^ "Article 2.5 of Chapter 2 of Division 1". California Streets & Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
  12. ^ California Department of Transportation (August 2019). "Officially Designated State Scenic Highways and Historic Parkways" (XLSX). Sacramento: California Department of Transportation. Retrieved October 19, 2017.
  13. National Scenic Byways Online, Yuba-Donner Scenic Byway Archived 2008-02-14 at the Wayback Machine
    , accessed January 2008
  14. California Highways and Public Works
    : Centennial Edition, September 9, 1950, p. 64
  15. ^ Official Automobile Blue Book, Volume Eight, 1919, pp. 146-147, 176-178, 225-226, 231
  16. ^ Automobile Club of Southern California, Automobile Road Map of California, 1917
  17. ^ a b Howe & Peters, Engineers' Report to California State Automobile Association Covering the Work of the California Highway Commission for the Period 1911–1920, pp. 11-16
  18. ^ Ben Blow, California Highways: A Descriptive Record of Road Development by the State and by Such Counties as Have Paved Highways, 1920 (Archive.org or Google Books), pp. 104-105
  19. ^ California State Assembly. "Senate Constitutional Amendment No. 27—Resolution to propose to the people of the State of California an amendment to the constitution of said state, by adding to article sixteen thereof a new section to be numbered two, providing for the..." Forty-third Session of the Legislature. Statutes of California (Resolution). State of California. Ch. 46 p. 1520.
  20. ^ Oakland Tribune, Highway Commission Lays Plans for Building Lake Connection, September 6, 1925
  21. Fresno Bee
    , Route Follows Lake Shore, September 27, 1925
  22. ^ Cass Kennedy, Oakland Tribune, Tahoe-Ukiah Highway Ready for Heavy Travel, March 6, 1932
  23. Archive.org
    .
  24. ^ California State Assembly. "An act to amend Section 315 of the Streets and Highways Code, relating to the State Highway System". 1953 Session of the Legislature. Statutes of California. State of California. Ch. 1408 p. 3002.: "Route 15 is from Route 56 near Fort Bragg to Route 37 near Emigrant Gap via Willits, Calpella, Williams and Colusa."
  25. H.M. Gousha Company, California Archived 2008-08-22 at the Wayback Machine
    , 1955
  26. ^ H.M. Gousha Company, California, 1963
  27. ^ California State Assembly. "An act to add Section 253 and Article 3 (commencing with Section 300) to Chapter 2 of Division 1 of, and to repeal Section 253 and Article 3 (commencing with Section 300) of Chapter 2 of Division 1 of, the..." 1963 Session of the Legislature. Statutes of California. State of California. Ch. 385 p. 1173.: "Route 20 is from: (a) Route 1 near Fort Bragg to Route 101 at Willits. (b) Route 101 to Route 80 near Emigrant Gap via Williams and Colusa."
  28. ^ a b California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
  29. ^ California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
  30. California Numbered Exit Uniform System, State Route 20 Freeway Interchanges
    , Retrieved on 2009-02-05.
  31. ^ California Department of Transportation, California Numbered Exit Uniform System, U.S. Route 101 Freeway Interchanges, Retrieved on 2009-03-21.
  32. ^ "Elevation and Location of Summits and Passes in California". California Department of Transportation. Archived from the original on March 1, 2017.

External links

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