Interstate 80 Business (Sacramento, California)
|Capital City Freeway|
|Defined by S&HC § 350 and 351|
|Maintained by Caltrans|
|Length:||14.50 mi (23.34 km)|
|Existed:||1979 by FHWA
1981 (from I-80) by Caltrans – present
|West end:||I-80 in West Sacramento|
| I-5 in Sacramento
US 50 / SR 16 / SR 99 in Sacramento
|East end:||I-80 / SR 244 in Sacramento|
Interstate 80 Business, called the Capital City Freeway in its entirety, is a Business Loop of Interstate 80 through Sacramento. As it is state-maintained, unlike most business routes in California, it is assigned route numbers - part of U.S. Route 50 on its western half (5.64 miles/9.08 km), and unsigned State Route 51 on its eastern half (8.86 miles/14.26 km). The full road is a freeway, and carried Interstate 80 until 1983. The designation was reportedly changed in 1981, but the signage of Interstate 80 was transferred to the Beltline Freeway, previously signed as Interstate 880 in November 1983. At that time, the American Association of State Highway and Transportation Officials (AASHTO) assigned the Interstate 305 designation to the west half, which met Interstate Highway standards. However, the California Department of Transportation (Caltrans) has never signed this number, put it on any road signs, or used it internally. (Note: The Federal Highway Administration lists unsigned I-305 as 8.44 miles (13.58 km), increased from 5.3 miles (8.5 km) in 1999.
Route description 
Western section 
Business 80 begins in West Sacramento at Interstate 80, where I-80 leaves the West Sacramento Freeway onto the Beltline Freeway (which travels north of the Bryte neighborhood, over the Sacramento River, and into the Natomas area). This interchange in West Sacramento is also the current west end of U.S. Route 50 and the west end of the unsigned I-305.
In downtown West Sacramento, Business 80 and US 50 split from the West Sacramento Freeway, which is now locally maintained over the Tower Bridge, but once carried State Route 275. Business 80 crosses the Sacramento River on the Pioneer Memorial Bridge, intersecting with Interstate 5 on the east bank. State Route 99 once ran along I-5 to the north and Business 80 to the east, but this is now signed TO SR 99. After crossing I-5, Business 80 runs on top of an embankment between W and X Streets; this was originally known as the WX Freeway.
At an interchange southeast of downtown Sacramento, Business 80 turns north onto the south end of unsigned SR 51. US 50 continues east, State Route 99 heads south, and the "hidden" I-305 ends. The embankment carrying Business 80 east of downtown is between 29th and 30th Streets, and was known as the Elvas Freeway. Northeast of downtown, Business 80 crosses the American River before merging with the North Sacramento Freeway (the northern portion of State Route 160 towards downtown).
Eastern section 
The North Sacramento Freeway, originally a portion of U.S. Route 40, merges with the Elvas Freeway and continues north to Marconi Avenue. This portion of Interstate 80 was at one time designated to be bypassed by a newer version of Interstate 80, but that planned route along the western side of the Southern Pacific railroad tracks was cancelled by the City of Sacramento. The North Sacramento Freeway becomes the Roseville Freeway at the curve north of Marconi Avenue (also known as the Marconi Curve, where the freeway once ended at Auburn Boulevard). At the east end of Business 80, the Roseville Freeway continues northeast to Roseville as Interstate 80, while the short unsigned State Route 244 heads east to Auburn Boulevard. I-80 heads west around the north side of Sacramento; the built portion of the never completed North Sacramento Freeway replacement, in the median of I-80, now serves as parking and access for the northernmost three stations (Watt/I-80, Watt/I-80 West, and Roseville Road) on the Sacramento Regional Transit District's light rail Blue Line.
|This section requires expansion. (January 2008)|
Business 80 was part of Interstate 80 until the early 1980s, with the actual signage change occurring in 1983. The replacement for the North Sacramento Freeway was cancelled in 1978, and in 1979 the Federal Highway Administration removed it from the Interstate Highway System, redesignating the west half of the Capital City Freeway (which met Interstate Highway standards) as I-305. The east half was designated Federal Aid Primary 51. The next year, the California State Legislature extended U.S. Route 50 west to cover the west half of old I-80, and the east half was assigned the new SR 51 number (last used in 1965 for a short route in Orange). (The Interstate 880 designation, which had been used for the Beltline Freeway, was reused in 1984 for the Nimitz Freeway in the east bay communities of the San Francisco Bay Area.)
The old I-80 was never signed as US 50 (alone) or SR 51, but as a business route. Unlike most business routes in California, which run along locally-maintained streets through a downtown area, Business 80 was not assigned to the pre-freeway alignment of U.S. Route 40, but to a freeway. The existence of two freeways, both numbered 80, has caused some confusion, and in 1996 the full route was given the Capital City Freeway name. This name appears on overhead signs at prominent interchanges.
An earlier State Route 51 was defined on July 1, 1964 on a section of pre-1964 Legislative Route 2, providing a loop east of Interstate 5 (pre-1964 Legislative Route 174 there) through Orange, around the Orange Crush Interchange. It was removed from the state highway system in 1965.
Route confusion 
Business 80 is referred to as Business 80, Biz 80, Capital City Freeway, Cap City Fwy and US 50 (western section only) by residents and mapmakers. Caltrans does not normally use the Business 80 designation, except for signage and other related concepts like Cal-NExUS exit numbers (which are continuous along the business loop). Caltrans refers to the western half as US 50 and the eastern half as SR 51 for traffic condition reporting. The Caltrans traffic camera system refers to the route by its name, Capital City Freeway.
The SR 99 concurrency is not officially designated by Caltrans, but mapmakers often show it as such. SR 99 signage had existed along that route for motorists' convenience, but was removed in 2000, and replaced by TO SR 99 signs instead.
Exit list 
Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, and do not necessarily reflect current mileage. R reflects a realignment in the route since then. The numbers reset at county lines; the start and end postmiles in each county are given in the county column.
YOL 0.00[N 1]-3.16[N 1]
|West Sacramento||0.00||I-80 west – San Francisco||Westbound exit and eastbound entrance; west end of I-80 Bus. overlap; former US 40 west / US 99W north|
|0.00[N 1]||1A||I-80 east – Reno||Westbound exit and eastbound entrance; former I-880 east|
|1.20[N 1]||1B||Harbor Boulevard||Signed as exit 1 eastbound|
|2.50[N 1]||3||Jefferson Boulevard (SR 84) – Downtown Sacramento (SR 275), West Sacramento||SR 275 was former US 40 east / US 99W south|
|2.92[N 1]||3||South River Road||Westbound exit and eastbound entrance|
SAC L0.00[N 1]-8.86[N 2]
|Sacramento||L0.35[N 1]||4A||I-5 to SR 99 north – Redding, Los Angeles|
|4B||5th Street – Downtown Sacramento||Eastbound exit and westbound entrance; former SR 99|
|L0.96[N 1]||4B||10th Street – Downtown Sacramento||Westbound exit and eastbound entrance|
|L1.37[N 1]||5||15th Street, 16th Street||Former US 99W / SR 160|
|L2.20[N 1]||6A||26th Street||Westbound exit and eastbound entrance|
|6B||SR 99 south – Fresno|
|6A||US 50 east (El Dorado Freeway) – Placerville, South Lake Tahoe||East end of US 50 overlap|
|0.24[N 2]||6C||P Street||Westbound exit and eastbound entrance|
|0.24[N 2]||7A||N Street||Eastbound exit and westbound entrance|
|0.84[N 2]||7A||J Street||Westbound exit and eastbound entrance|
|1.20[N 2]||7B||H Street||Eastbound exit and westbound entrance|
|1.44[N 2]||7B||E Street||Westbound exit and eastbound entrance|
|3.36[N 2]||9A||Exposition Boulevard – Cal Expo|
|3.69[N 2]||9B||SR 160 south (North Sacramento Freeway) – Downtown Sacramento||Eastbound exit is via exit 9B; former US 40|
|4.06[N 2]||10A||Arden Way||Signed as exit 9B eastbound|
|4.74[N 2]||10B||El Camino Avenue – Carmichael||Signed as exit 10 eastbound|
|5.50[N 2]||11||Auburn Boulevard, Marconi Avenue||No eastbound entrance|
|5.96[N 2]||12A||Howe Avenue||Eastbound exit and entrance|
|6.21[N 2]||12B||Auburn Boulevard, Bell Street||Eastbound exit only; Auburn Boulevard was former US 40|
|6.79[N 2]||12C||Fulton Avenue||Signed as exit 12 westbound|
|14B||Watt Avenue||Signed as exits 14A (south) and 14B (north) eastbound|
|8.52[N 2]||14C||Auburn Boulevard (SR 244)||Signed as exit 14A westbound; Auburn Boulevard was former US 40|
|8.86[N 2]||I-80 east – Reno||Eastbound exit and westbound entrance|
- Indicates that the postmile represents the distance along US 50.
- Indicates that the postmile represents the distance along hidden SR 51.
See also 
- California Highways: Interstate 80
- January 1, 2006 California Log of Bridges on State Highways
- Auxiliary Routes of the Dwight D. Eisenhower National System Of Interstate and Defense Highways as of October 31, 2002
- Kurumi.com: I-305 California
- District VII State Highway Numbering Map, September 20, 1963
- California Highways: Route 51
- California Department of Transportation, State Truck Route List (XLS file), accessed February 2008
- California Department of Transportation, Log of Bridges on State Highways, July 2007
- California Department of Transportation, All Traffic Volumes on CSHS, 2005 and 2006
- California Department of Transportation, California Numbered Exit Uniform System, Interstate Business Loop 80 Freeway Interchanges, Retrieved on 2009-02-07.
- Windmiller, Joel. "Elvas Freeway — US 99E (map of Sacramento showing the routing of US 99W)". Golden State Highways. Retrieved July 23, 2011.
- "Elvas Freeway - US 99E (photo of signage)". Joel Windmiller. Retrieved 2009-02-27.
|Wikimedia Commons has media related to: Interstate 80 Business (Sacramento, California)|
- California @ AARoads.com - Business Loop I-80 Sacramento
- The Highwayman's Road Reports - Elvas Freeway, North Sacramento Freeway and West Sacramento Freeway[dead link]