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California State Route 70

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For the former highway signed as Route 70, see U.S. Route 70 (California).

State Route 70 marker
State Route 70
Map
SR 70 highlighted in red
Route information
Maintained by Caltrans
Length178.528 mi[1] (287.313 km)
(plus about 0.5 mi (1 km) on SR 20)
HistoryState highway in 1910 and 1931; became SR 24 in 1934, US 40A in 1954, and SR 70 in 1964
Tourist
routes		 Feather River Scenic Byway
Major junctions
Southwest end SR 99 near Pleasant Grove
Major intersections
Northeast end US 395 at Hallelujah Junction
Location
CountryUnited States
StateCalifornia
CountiesSutter, Yuba, Butte, Plumas, Lassen
Highway system
← US 70→ SR 71

State Route 70 (SR 70) is a state highway in the U.S. state of California, connecting SR 99 north of Sacramento with U.S. Route 395 (US 395) near Beckwourth Pass (lowest in the Sierra Nevada) via the Feather River Canyon. Through the Feather River Canyon, from SR 149 to US 395, SR 70 is the Feather River Scenic Byway, a Forest Service Byway that parallels the ex-Western Pacific Railroad's Feather River Route.

The Beckwourth Trail was the earliest predecessor of SR 70, which was a spur of the California Trail. This was followed by the railroad, mostly built on the route of the trail; a dirt road was needed for construction that was later converted into part of the present state highway. Construction on the highway began in 1928, which involved the boring of three tunnels. Previously, the road was signed as U.S. Route 40 Alternate, crossing the Sierra Nevada at a lower elevation than Donner Pass on US 40, now Interstate 80 (I-80). The road was renumbered SR 70 in the 1964 state highway renumbering. Today, portions of SR 70 have been upgraded to a four-lane expressway, and even a freeway in a few locations.

Route description

[edit]

State Route 70 begins at a partial interchange with SR 99 north of Sacramento, close to the Feather River Route rail line that parallels the entire highway, and heads north along a four-lane mix of expressway and freeway. Just north of the Bear River crossing / Yuba County line, in Plumas Lake, SR 70 becomes a freeway for the second time, which continues to just beyond the Yuba River in Marysville. Within that city, SR 70 makes two turns and overlaps SR 20 before heading north on a two-lane road, expanding to four lanes shortly thereafter. Another four-lane freeway begins south of SR 162 in Oroville, and ends at SR 149. SR 149 is a major connection northwest to SR 99, and became the straight-through movement when the construction to replace the intersection with an interchange was completed in November 2008.[2] The State Scenic Highway portion of SR 70 begins at SR 149, which is where SR 70 turns northeast out of the Sacramento Valley and into the mountains. The short SR 191 spurs north to Paradise, while SR 70 crosses the West Branch Feather River on the double-decker West Branch Bridge, with the Feather River Route below. A short four-lane section runs over the bridge towards Jarbo Gap, where the present SR 70 merges with the old road (Dark Canyon Road) that was used before the Feather River was dammed to create Lake Oroville in the 1960s.[3]

The Pulga Bridges over the Feather River Route (lower bridge) and North Fork Feather River

After crossing through Jarbo Gap, SR 70 drops down into the canyon of the North Fork Feather River, which it follows almost to Quincy, usually on the opposite side from the Feather River Route; this results in two places where both transportation lines cross the river and each other. The first of these is the Pulga Bridge, an arch bridge that crosses over a lower railroad truss bridge; soon after are the highway's three tunnels through rock formations in the canyon. After a fair distance through the canyon, and that formed by the East Branch North Fork Feather River, SR 70 reaches the junction with State Route 89 near Paxton; Routes 70 and 89 overlap southeast from that point, where the East Branch splits into Indian Creek and Spanish Creek.[3]

The highway heads southeast, partly along the latter creek, past Keddie to Quincy in the American Valley. It leaves the valley via Greenhorn Creek, passing the Feather River Route's Williams Loop and then following the small Estray Creek to Lee Summit, which the rail line passes under in the Spring Garden Tunnel. This brings SR 70 into the valley of the Middle Fork Feather River, which takes it southeast to Blairsden, where the State Scenic Highway ends and State Route 89 splits to the south, and then east, through the Plumas National Forest, to Portola and Beckwourth. The large Sierra Valley begins at the latter community, and SR 70 heads almost directly across, passing the north end of SR 49 at Vinton and the south end of SR 284 at Chilcoot before crossing Beckwourth Pass, which the railroad takes the Chilcoot Tunnel under, and descending slightly to end at U.S. 395 at Hallelujah Junction.[3]

The portion of SR 70 west of State Route 89 near Blairsden is also eligible for the State Scenic Highway System,[4] but has not been designated as such by Caltrans.[5] The entire route is part of the California Freeway and Expressway System,[6] though it is mostly two lanes. SR 70 south of SR 149 is part of the National Highway System,[7] a network of highways that are considered essential to the country's economy, defense, and mobility by the Federal Highway Administration.[8] All of SR 70 is designated as the Feather River Scenic Byway, a National Forest Scenic Byway.[9]

History

[edit]

Trails

[edit]

James Beckwourth opened the Beckwourth Trail over Beckwourth Pass in 1851, crossing the Sierra Nevada at a lower elevation than the existing Donner Pass route of the California Trail. This split from the Truckee Route of the California Trail near Reno and roughly followed the present SR 70 to Quincy, but, rather than passing through the Feather River Canyon, it followed Oroville-Quincy Highway along ridges to Bidwell's Bar.[10] A company was incorporated on July 23, 1855, to build the Quincy and Spanish Ranch Wagon Road, which bypassed the older trail from Quincy west to Spanish Ranch and began collecting tolls in November. The Pioneer Wagon Road, another toll road, was built in 1856 and 1857, continuing the improvements southwest to Buckeye (just before the Butte County line). An 1866 law authorized Plumas County to improve the portion from Quincy east to Beckwourth. The county also improved the road east from Beckwourth over the pass as part of the Red Clover Wagon Road, which began at Genesee and was completed in the 1870s.[11]

The Western Pacific Railroad completed its main line into California in 1909. This followed the old Beckwourth Trail east of Quincy, but to the west it reached Oroville and Marysville via the Feather River Canyon. While building the railroad, the Utah Construction Company had created a dirt road through the canyon to assist with construction; citizens created the Plumas County Road Association in 1911 to push for improvements to this roadway and creation of a year-round route between Oroville and Quincy (the existing route over the ridges was closed for at least four months each winter). The first state highway bond issue, passed by the state's voters in 1910, included a Route 30 connecting Oroville with Quincy. Plumas County surveyor Arthur W. Keddie surveyed the Feather River Canyon route for the California Highway Commission in 1913, but the state announced in 1916 that the existing ridge route would be improved. After much debate, the state legislative road committee included the statement that this route would follow the Feather River in the 1919 amendment authorizing a third bond issue;[12] instead of keeping it as Route 30, the Highway Commission changed the designation to an extension of the short Richvale-Oroville (now SR 162) Route 21, which was also part of the first bond issue.[13][14]

Modern route

[edit]
Westbound through the Arch Rock Tunnel, the westernmost of the three

Construction began on July 1, 1928, with convict labor for the easier portions and contractors for the remainder, as well as bridges and tunnels, but was slowed by the Great Depression. On the most difficult portion, between Cresta and Rock Creek, three tunnels had to be built at Arch Rock, Grizzly Dome, and Elephant Butte; at the former two, surveyors had to hang out on rope over steep granite slopes, and rockslides repeatedly caused delays. The commission dedicated the road at a ceremony at Grizzly Dome, halfway between the ends, on August 14, 1937. Construction had cost $8.15 million for 78 miles (126 km) of new road. The remainder of the old trail from Quincy to the junction with Route 29 (now U.S. 395) east of Beckwourth Pass was added to the state highway system in 1931 as an extension of Route 21,[15] and was paved by 1936.[14] A new Route 87 was created in 1933, stretching from Woodland via Marysville and Oroville to Route 3 (State Route 99) southeast of Chico, including the present SR 70 between Marysville and Oroville.[16][17] Route 87 from Woodland to Oroville and Route 21 from Oroville to east of Beckwourth Pass became a new State Route 24 in 1934;[18] State Route 24 was extended southwest from Woodland to Oakland by the end of 1937.[19]

U.S. Route 40 Alternate

[edit]
Alternate plate 1961.svg
U.S. Route 40 Alternate marker
U.S. Route 40 Alternate
LocationSacramento, California–Reno, Nevada
Existed1954–1964
Main article: Special routes of U.S. Route 40 § California alternate route

In 1954,[20][21] the original part of State Route 24 was replaced by U.S. Route 40 Alternate, which continued south on U.S. 99W from Woodland to Davis and southeast on U.S. 395 to Reno, Nevada to join U.S. 40 at both ends.[22] A direct route from Marysville south to Sacramento was added to the state highway system in 1949 as Route 232,[23][24] and later became part of a rerouted State Route 24.[25] The U.S. 40 Alternate designation was short-lived, and was mostly replaced by State Route 70 in the 1964 renumbering. Southwest of Marysville, former U.S. 40 Alternate instead became State Route 113, and SR 70 ran south along former State Route 24 (Route 232) to a point north of Sacramento, where the new State Route 99 came in from the northwest and continued south.[26][27] Despite SR 70 always ending at State Route 99, it was once signed along State Route 99 (El Centro Road, Garden Highway, and the Jibboom Street Bridge) to Sacramento.[28]

Modern alignments

[edit]

When it was originally built, the Feather River Highway northeast from Oroville followed the present Oroville Dam Boulevard (County Route B2) to the present location of the Oroville Dam, and then ran north and northeast alongside the North Fork Feather River along a route now covered by Lake Oroville. It left to the north on Dark Canyon Road, meeting the present alignment at Jarbo Gap.[29] Since the old road would be flooded, a $14.8 million new alignment, much of it four lanes, was built around the west side; the Western Pacific Railroad was also relocated to a nearby alignment.[30] The double-decker West Branch Bridge over the West Branch Feather River northwest of the dam, carrying the highway above the rail line, was dedicated on August 15, 1962.[31] Three portions of SR 70 have been upgraded to freeways: north of SR 99 to Berry and Kempton Roads in the early 2010s; south from Marysville to the State Route 65 split in the mid-1950s, extended farther south in the late 1960s and late 2000s; and around downtown Oroville, built in the early 1960s.[32]

In 2004, SR 70 was upgraded to a four-lane expressway between Feather River Boulevard north of the Bear River and the Yuba/Sutter county line to the freeway portion south of McGowan Parkway.[33] A freeway interchange was constructed in 2008 at Plumas Lake Boulevard for access to the Plumas Lake development previously served at an uncontrolled intersection with Plumas Arboga Road. The removal of this intersection effectively upgraded the expressway portion to freeway south to the Feather River Boulevard intersection.[34][35][36] In the early 2010s, the last two-lane segment of SR 70 south of Marysville was expanded to a four-lane expressway, with a freeway section bypassing the small town of East Nicolaus to the west. In 2015, the interchange with Feather River Boulevard in Plumas Lake was opened to traffic, eliminating the last signalized intersection between Sacramento (with SR 99) and Marysville.[37]

In 2023, one of the last stretches of two-lane highway of SR 70, between East Gridley Road and just north of Laurellen Road, was widened to a four-lane expressway, with a center left-turn lane and eight foot wide shoulders on each side.[38] The project was completed in September of that year.[39] The portions between SR 162 and East Gridley Road were completed in the early 2010s to the early 2020s.[40]

Future

[edit]

The last two-lane section of SR 70 between Marysville and Oroville, which involves the portion between 14th Street in Marysville and Laurellen Road just north of Marysville was approved to be expanded into four lanes, with a center left-turn lane. It will involve expanding the narrow roadway under two railroad overcrossings and the relocation of a levee. The project is on hold as the city of Marysville is in a lawsuit with Caltrans over the increased traffic through the city.[40] Once the project is completed, SR 70 will become a continuous four-lane highway from its start at SR 99 all the way to SR 191 south of Paradise, even though traffic will still have to navigate through the center of Marysville.

Major intersections

[edit]

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on primarily a south-to-north alignment (especially the freeway segment between State Route 99 and State Route 149), 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][32][41]		Exit
[42]		DestinationsNotes
Sutter
SUT R0.05-8.30		​R0.05
 SR 99 south – Sacramento		Interchange; southbound exit and northbound entrance; southwestern terminus of SR 70; SR 99 north exit 319
​M1.00

 Striplin Road to SR 99 north – Yuba City
​1.18South end of freeway
East NicolausM3.994Nicolaus Avenue
​6.82North end of freeway
​7.09South end of freeway
Yuba
YUB 0.00-25.82		Plumas LakeR0.359Feather River Boulevard
R3.4712Plumas Lake Boulevard
OlivehurstR7.3516McGowan Parkway
R8.2917
 SR 65 south – Roseville		Southbound left exit and northbound entrance; northern terminus of SR 65; former US 99E south
R9.2818AOlivehurst (Olivehurst Avenue)
LindaR10.1618BErle Road
R11.39
13.01		20AFeather River BoulevardServes Beale AFB, Yuba College (northbound only)
13.2320BNorth Beale RoadNo southbound entrance; serves Beale AFB, Yuba College
Marysville14.08—1st Street, F StreetSouthbound entrance only
14.25North end of freeway
14.70
0.99[N 1]
 SR 20 west (E Street) / 9th Street – Yuba City		South end of SR 20 overlap; former US 40 Alt. west / US 99E north
1.47[N 1]
14.71
 SR 20 east (12th Street) – Grass Valley		North end of SR 20 overlap
Butte
BUT 0.00-48.08		​12.65South end of freeway
Oroville13.9046 SR 162 (Oroville Dam Boulevard, SR 70 Bus. east) – Richvale
14.6147Montgomery Street (CR B2)Western terminus of CR B2
15.43–
15.72		48Grand Avenue, Nelson Avenue (SR 70 Bus. west)
​16.6349Garden Drive
Wicks Corner20.48—

 SR 149 north to SR 99 – Chico, Red Bluff		Southern terminus of SR 149
​R21.22North end of freeway
​21.87
 SR 191 north (Clark Road) / Table Mountain Boulevard – Paradise		Southern terminus of SR 191
​28.22West Branch Bridge over West Branch Feather River
​40.99Pulga Bridge over North Fork Feather River
​47.15Arch Rock Tunnel
Plumas
PLU 0.00-95.96		​0.77Grizzly Dome Tunnel
​0.99Elephant Butte Tunnel
​33.03
 SR 89 north – Greenville, Lake Almanor		West end of SR 89 overlap
​49.80Massack Rest Area
BlairsdenR66.63
 SR 89 south – Truckee		East end of SR 89 overlap
Portola75.96 CR A15 (Gulling Street)Northern terminus of CR A15
​R79.20Davis Rest Area
BeckwourthR80.32 CR A23 (Beckwourth-Calpine Road) – CalpineNorthern terminus of CR A23
​83.17 CR A24 (Beckwourth-Loyalton Road)Northern terminus of CR A24
Vinton92.07
 SR 49 south – Loyalton		Northern terminus of SR 49
Chilcoot94.28 SR 284 (Frenchman Lake Road) / Patterson Street – Frenchman Lake Recreation AreaSouthern terminus of SR 284
​95.76[43]Beckwourth Pass, elevation 5,212 feet (1,589 m)[43]
Lassen
LAS 0.00-3.89		Hallelujah Junction3.89 US 395 – Reno, SusanvilleInterchange; northeastern terminus of SR 70; US 395 exit 8; former US 40 Alt. east
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  1. ^ a b Indicates that the postmile represents the distance along SR 20 rather than SR 70.

Oroville business loop

[edit]
Business plate California.svg
State Route 70 Business marker
State Route 70 Business
LocationOroville, California

State Route 70 Business (SR 70 Bus.) is a business route of California State Route 70 in Oroville. It provides access to downtown Oroville, following Oroville Dam Boulevard (SR 162), Myers Street, Montgomery Street (CR B2), Table Mountain Boulevard, and Nelson Avenue.

Major intersections

The entire route is in Oroville, Butte County.

mikmDestinationsNotes
0.00.0
 SR 162 west (Oroville Dam Boulevard west) – Willows		Continuation beyond SR 70
Module:Jctint/USA warning: Unused argument(s): state
0.00.0 SR 70 – Marysville, QuincyInterchange; southern terminus; south end of SR 162 overlap; SR 70 exit 46
1.52.4
 SR 162 east (Oroville Dam Boulevard east) / Myers Street south – Lake Oroville		North end of SR 162 overlap
2.23.5Montgomery Street west (CR B2 west) / Myers Street northSouth end of CR B2 overlap; Montgomery Street is former US 40 Alt. west
2.64.2Montgomery Street east (CR B2 east) / Washington AvenueMontgomery Street Roundabout; north end of CR B2 overlap
3.45.5Table Mountain Boulevard, Cherokee RoadTable Mountain Roundabout; Table Mountain Boulevard is former US 40 Alt. east
4.26.8
 SR 70 north / 3rd Street – Chico, Quincy		Interchange; northern terminus; SR 70 exit 48; connects to SR 149
4.26.8

 4th Street to SR 70 south – Marysville
4.26.8Nelson Avenue westContinuation beyond SR 70
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

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References

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  1. ^ a b c California Department of Transportation. "State Truck Route List". Sacramento: California Department of Transportation. Archived from the original (XLS file) on September 5, 2015. Retrieved June 30, 2015.
  2. ^ Weston, Mary (November 20, 2008). "Highway 49: a reason to celebrate". Chico Enterprise-Record. Chico, California. Retrieved June 29, 2012.
  3. ^ a b c Google Maps street maps and USGS topographic maps, accessed December 2007 via ACME Mapper
  4. ^ "Article 2.5 of Chapter 2 of Division 1". California Streets & Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
  5. ^ California Department of Transportation (August 2019). "Officially Designated State Scenic Highways and Historic Parkways" (XLSX). Sacramento: California Department of Transportation. Retrieved October 13, 2017.
  6. ^ "Article 2 of Chapter 2 of Division 1". California Streets and Highways Code. Sacramento: California Office of Legislative Counsel. Retrieved February 6, 2019.
  7. ^ Federal Highway Administration (March 25, 2015). National Highway System: California (North) (PDF) (Map). Scale not given. Washington, DC: Federal Highway Administration. Retrieved October 13, 2017.
  8. ^ 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.
  9. ^ Staff. "Feather River Scenic Byway". America's Byways. Federal Highway Administration. Archived from the original on October 23, 2011. Retrieved October 23, 2011.
  10. ^ The Beckwourth Trail: A Route to the Gold Country, accessed December 2007
  11. ^ Illustrated History of Plumas, Lassen & Sierra Counties, 1882
  12. ^ 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.: "Feather river route Oroville to Quincy"
  13. ^ Howe & Peters, Engineers' Report to California State Automobile Association Covering the Work of the California Highway Commission for the Period 1911-1920, pp. 11-14
  14. ^ a b Jim Young, Plumas County: History of the Feather River Region, Arcadia Publishing, 2003, pp. 65-68
  15. ^ California State Assembly. "An act establishing certain additional state highways and classifying them as secondary highways". Forty-ninth Session of the Legislature. Statutes of California. State of California. Ch. 82 p. 102.: "Quincy to State Highway Route 29, near Chats."
  16. ^ California State Assembly. "An act to amend sections 2, 3 and 5 and to add two sections to be numbered 6 and 7 to an act entitled 'An act to provide for the acquisition of rights of way for and the construction, maintenance..." Fiftieth Session of the Legislature. Statutes of California. State of California. Ch. 767 p. 2035.: "State Highway Route 3 near Chico to State Highway Route 21 near Oroville." "State Highway Route 15 near Marysville to State Highway Route 21 near Oroville." "State Highway Route 7 near Woodland to State Highway near Yuba City."
  17. ^ California State Assembly. "An act to establish a Streets and Highways Code, thereby consolidating and revising the law relating to public ways and all appurtenances thereto, and to repeal certain acts and parts of acts specified herein". Fifty-first Session of the Legislature. Statutes of California. State of California. Ch. 29 p. 276, 282.
  18. ^ Dennis, T.H. (August 1934). "State Routes Will Be Numbered and Marked with Distinctive Bear Signs". California Highways and Public Works. 11 (8): 20–21, 32. ISSN 0008-1159 – via Archive.org.
  19. ^ Fresno Bee, New Bay Area Tunnel is Modern Traffic Unit, December 15, 1937
  20. ^ Reno Evening Gazette, April 28, 1954: "The complete caravan will then proceed up the Feather river canyon and into Reno via Highway 24, the Feather river route."
  21. ^ Reno Evening Gazette, July 16, 1954: "...located on Alternate U.S. 40, former State Route 24, about two miles (3 km) east of Portola."
  22. ^ H.M. Gousha Company, California Archived December 2, 2011, at the Wayback Machine, 1955
  23. ^ California State Assembly. "An act...relating to state highway routes". 1949 Session of the Legislature. Statutes of California. State of California. Ch. 1467 p. 2556.: "Route 207 is from Sacramento to Marysville..."
  24. ^ California State Assembly. "An act...relating to state highway routes". 1951 Session of the Legislature. Statutes of California. State of California. Ch. 1562 p. 3560.: renumbered Route 207 to 232, since a Route 207 already existed
  25. ^ H.M. Gousha Company, California, 1963
  26. ^ "Route Renumbering: New Green Markers Will Replaces Old Shields" (PDF). California Highways and Public Works. 43 (1–2): 11–14. March–April 1964. ISSN 0008-1159. Retrieved March 8, 2012.
  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. 1177.: "Route 70 is from Route 99 near Catlett Road to Route 395 near Hallelujah Junction via Quincy and Beckwourth Pass."
  28. ^ H.M. Gousha Company, Sacramento, California Archived April 11, 2008, at the Wayback Machine, 1967
  29. ^ United States Geological Survey, Oroville, Calif. (1944, roads 1943) and Big Bend Mtn., Calif. (1948), scale 1:62500
  30. ^ Oakland Tribune, Man, Machines Change Face of Earth in Gigantic Dam Project at Oroville, June 8, 1964
  31. ^ Oakland Tribune, Bridge Dedicated, August 15, 1962
  32. ^ a b California Department of Transportation (July 2007). "Log of Bridges on State Highways". Sacramento: California Department of Transportation.
  33. ^ "Sacramento Valley Route 70/99 Business Plan: Appendix A, page A-4" (PDF). Caltrans. November 29, 2006. Archived from the original (PDF) on November 16, 2009. Retrieved February 25, 2009.
  34. ^ "State Route 70/Plumas Lake Blvd. Interchange". Yuba County Public Works. Retrieved February 25, 2009.
  35. ^ "A new path opens for Plumas Lake". Appeal-Democrat. September 9, 2008. Archived from the original on July 18, 2012. Retrieved February 25, 2009.
  36. ^ 39.033961,-121.543529 - Map of Cities in 39.033961,-121.543529 - MapQuest (Map). MapQuest. Retrieved February 25, 2009.
  37. ^ "Marysville to Sacramento a straight shot on Highway 70". Appeal-Democrat. September 29, 2015. Retrieved October 3, 2015.
  38. ^ "State Highway 70 Safety Improvement Project | Caltrans | Caltrans". dot.ca.gov. Retrieved August 23, 2022.
  39. ^ "Caltrans Completes SR-70 Corridor Improvement and Bridge Project". Caltrans. September 15, 2023. Retrieved August 28, 2024.
  40. ^ a b "Last two-lane stretches of Highway 70 now being widened to four lanes". Chico Enterprise-Record. May 4, 2022. Retrieved August 23, 2022.
  41. ^ California Department of Transportation, All Traffic Volumes on CSHS Archived July 21, 2011, at the Wayback Machine, 2006
  42. ^ "California Numbered Exit Uniform System - State Route 70 Freeway Interchanges" (PDF). Caltrans. September 27, 2018.
  43. ^ a b "Elevation and Location of Summits and Passes in California". California Department of Transportation. Archived from the original on March 1, 2017.
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