CALIFORNIA STATE ROUTE 237 - Mtn View/Alviso Freeway

Highway 237 is a combination of a 9-mile freeway and a 2-mile city street that serves the cities of Mountain View, Sunnyvale, Santa Clara, San Jose and Milpitas. The freeway segment is known as the Southbay Freeway but is also called the Mtn View/Alviso Freeway. The city street segment in Milpitas is called Calaveras Blvd.

The original freeway ran from U.S. 101 to just east of the Lawrence Expwy exit. The section from Lawrence to Interstate 880 was upgraded to a freeway in the early 1990's. The section between Highway 85 and U.S. 101 was upgraded in 1997. Calaveras Blvd through Milpitas will not be upgraded in my lifetime.

Exit 377A Exit Number Installed
Exit 377A Exit Number Not Installed

Exit 8

North of Hwy 237 is the San Jose sewage treatment plant. South of the freeway are a number of high tech companies like Cisco and Altera. Zanker can be a good alternative to the often congested First Street.

Exit 7

North First Street connects downtown San Jose to the high tech companies that call north San Jose home. It also connects the community of Alviso to the rest of San Jose.

Exit 6

Use Great America Parkway to get to the Santa Clara Convention Center and the Great America theme park. Lafayette travels through Santa Clara's industrial area.

There are plans to build a new stadium for the San Francisco 49ers near the convention center so this may become a major access point for the new stadium.

Exit 5

Lawrence Expwy is part of Santa Clara County's expressway system, Lawrence Expwy travels through the heart of Sunnyvale's industrial area, home to a number of tech companies. Lawrence serves the cities of Saratoga, San Jose, Sunnyvale and Santa Clara.

Caribbean Drive is the northern extension of Lawrence Expwy. It eventually loops around to become Mathilda Avenue.

Exit 3B

Mathilda Avenue is a major north-south road through Sunnyvale. Lockheed, Yahoo and Juniper Networks are all located north of this exit. Sunnyvale's shopping district lies to the south.

There is no direct ramp to southbound U.S. 101. You must use Mathilda Avenue's on-ramp.

Exit 3A


This exit for northbound U.S. 101 is very congested during commute hours because it handles both west and eastbound Hwy 237 traffic.

Exit 2

Middlefield and Maude lead to more high tech companies located in northern Sunnyvale and western Mountain View. This was the last interchange to be built during the conversion of Hwy 237 from expressway to freeway.


Exit 1C

Whisman Road can be taken to get to the Moffett Federal Airfield and NASA/AMES. Dana Street and Evelyn Avenue both lead to downtown Mountain View.

Exit 1B

This is the exit for southbound Hwy 85/Stevens Creek Freeway. Although the destination cities are Los Gatos and Santa Cruz, Hwy 85 also passes through Sunnyvale, Cupertino, San Jose and Saratoga. You can also use this exit to get to southbound Hwy 82/El Camino Real without encountering a signal light.

About 1/2 a mile after the Hwy 85 south exit, Hwy 237 ends at the El Camino Real traffic signal and becomes Grant Road. El Camino Hospital is located a few blocks south of El Camino Real.