page_title: California State Route 37
section_title: White Slough and Sonoma Boulevard interchange
hierarchical_section_title: California State Route 37 / History / White Slough and Sonoma Boulevard interchange
caption_attribution_description: a display of the various components of the project including the Highway 37/Highway 29 interchange.
context_page_description: State Route 37 is a state highway in the U.S. state of California that runs 21 miles along the northern shore of San Pablo Bay. It is built from U.S. Route 101 in Novato and runs through northeastern Marin County, the southern tip of Sonoma and Solano Counties to Interstate 80 in Vallejo. It serves as a vital connection between the four counties of the North Bay Area, north of San Francisco; Sonoma Raceway and Six Flags Discovery Kingdom are accessible from Route 37. The road is commonly called Highway 37 by local residents.
  Route 37 has been proposed to be built to freeway standards since the early 1950s. However, the proposal was met with many economic and environmental obstacles, making the task all but impossible for much of the route. The route is plagued by flooding which can be exacerbated by levee breaks near Vallejo. Most of the highway crosses a marsh that is home to endangered salt marsh harvest mice. A section of highway was once known as "Blood Alley" for its high rate of fatal accidents. A concrete barrier built in the 1990s eliminated those fatal head-on collisions.
context_section_description: To protect White Slough while still allowing the widening of SR 37, the White Slough Protection and Development Act was passed in 1990. It allowed up to 13 acres of wetlands to be filled but required at least four times as much wetland restoration elsewhere in the Bay Area.
  After environmental studies on the White Slough, Caltrans widened and elevated that section of the road and converted it to a freeway. To accommodate bicycles and pedestrians, a cycleway was built along the eastbound side of the freeway. Finally, Caltrans completed the overpass which crossed SR 29, Broadway, and Mini Drive (bypassing Marine World Parkway, three traffic signaled intersections, and a railroad grade crossing). The project was completed in the summer of 2005, and fully open to traffic on August 20.
caption: Display of the various components of the project including the SR 37/SR 29 interchange.
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