California State Route 37
|Defined by S&HC § 337|
|Maintained by Caltrans|
|Length:||21.494 mi (34.591 km)|
|Existed:||1917 – present|
|West end:||US 101 in Novato|
| SR 121 at Sears Point
SR 29 in Vallejo
|East end:||I-80 in Vallejo|
State Route 37 (SR 37) is a state highway in the northern part of California that runs 21 miles (34 km) along the northern shore of San Pablo Bay. It is built from U.S. Route 101 in Novato and runs through the southern tips of Sonoma and Napa 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; Infineon Raceway and Six Flags Discovery Kingdom are accessible from Route 37.
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. Problems included a levee break in Vallejo which turned part of the land around the highway into a marsh that is home to endangered salt marsh harvest mice, and a section of highway known as "Blood Alley" for its high rate of fatal accidents.
Intended to run from State Route 251, a highway that has not been constructed, SR 37 begins in Novato with a junction at U.S. Route 101 and heads northeast as a freeway for about a quarter mile before becoming a four-lane expressway. The route passes over the Petaluma River into Sonoma County before meeting the southern terminus of State Route 121 at a signal-controlled intersection near Sears Point and the Sonoma Raceway.
The route continues as a divided two-lane expressway in a more easterly, then southeasterly, direction as it crosses Tolay Creek and proceeds through the Napa Sonoma Marsh at the northern edge of San Pablo Bay. Before the construction of the barrier in 1995, this portion of SR 37 was three lanes with the middle lane alternately serving as a passing lane for each direction. This stretch of highway was given the nickname of "Blood Alley" for its high-rate of fatal accidents. With the middle lane removed, accidents dropped dramatically.
SR 37 becomes a four-lane freeway on Mare Island, approaching northern Vallejo. After it crosses over the Napa River Bridge, it continues as a freeway, overlapping the old highway alignment and passing north of the old road known as Marine World Parkway (due to its proximity to the Six Flags Discovery Kingdom, previously known as Marine World). SR 37 travels in a northeasterly direction along the White Slough before turning east as it crosses over State Route 29 and heads to its eastern terminus at I-80. In the early 1990s, the stretch between Fairgrounds Drive, which serves as the entrance to Discovery Kingdom, and Mini Drive was upgraded to a freeway. In 2004 and 2005, following over fifty years of complications, the remaining non-freeway section in Vallejo was upgraded as well.
Route 37 is also known as Randy Bolt Memorial Highway from Route 29 to Skaggs Road, and Sears Point Toll Road, which was originally a toll road that ran from Route 121 to Vallejo. This route is part of the California Freeway and Expressway System and is eligible for the State Scenic Highway System. However, it is not designated as a scenic highway by Caltrans.
The stretch of road east of Sears Point was once part of the historical El Camino Real. As a result of the State Highways Acts of the early 20th century, the Black Point Cut-off was built over it and opened to traffic in 1917. This highway followed the current alignment east of Sears Point, before diverting northeast along present-day Route 121. It was first designated Legislative Route 8 (LRN 8), later being signed as State Route 37. 
Prior to being under State control, the section between Sears Point and Vallejo was known as the Sears Point Toll Road, a toll road managed by Golden Gate Ferry that was built over an ancient Native American trail. When it was purchased by the State in 1938, tolls were removed; it then became signed as State Route 48 until 1964.
Route 37 was redefined in the 1964 state highway renumbering as a route starting at SR 251, then SR 17, near Nicasio and ending at I-80 near Lake Chabot. The whole of SR 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.
Sears Point Toll Road
As late as 1926, Golden Gate Ferries, owners of the Sears Point Toll Road Co., began plans to build the Sears Point Toll Road, with a contract awarded to Oakland-based Hutchinson Company in October 1927. The paved toll road was to be built on top of an ancient Native American trail along the San Pablo Bay shore between the Sacramento Highway and the Black Point cut-off (LRN 8) near Sears Point. It was expected to cost $775,000USD, with a toll not exceeding $0.35. Toll road officials explained the purpose of the road; to stimulate motor vehicle usage by reducing the commute times and expenses of motorists traveling from the East Bay and Sacramento areas by offering a more direct route toward Marin, Sonoma and the Redwood Highway. The road opened for traffic in 1928. 
On November 29, 1932, the California State Highway Commission received a recommendation to purchase the road and was able to invest $418,000USD by 1936. However, the U.S. Navy owned rights to the right-of-way of part of the route, and opposed the purchase. This resulted in congressional actions to establish a clear title deed for the route.  House Representative Richard J. Welch was one of the earliest government officials to pressure the State of California to acquire the toll road in order to convert it into a toll-free highway. He argued that having only one toll road to travel in order to reach the Golden Gate Bridge would benefit commuters; he also cited the ten and seventh-tenths-mile difference in distance between the toll road and a route through Napa. A Navy Department deed permitting the State to purchase the road was granted by the Attorney General on October 26, 1938. The highway then became signed as State Route 48 until the 1964 renumbering.
Highway upgrading in Vallejo
By 1955, talks began about upgrading the highway. After a proposition to turn much of the route into a toll road failed, it was decided a four-lane freeway would be the best decision. However, opposition from residents in surrounding neighborhoods as well as a federal oil embargo only allowed widening of the approach between Fairgrounds Drive and I-80. In 1977, a levee broke and flooded a portion of the developed land, turning it into protected wetlands that is home to endangered species. Because of its new status, environmental studies were needed in order to continue the project.
Soon after, the project was split into different phases to handle problems with particular areas. It was first divided between the newly created marshlands and the section between Sonoma Blvd. (SR 29) and I-80. With Marine World being relocated, the city was able to the widen the latter section and build an overpass across Fairgrounds Drive in 1992.
While the Vallejo section of SR 37 was being updated, another problem with the route would hinder its progress. The section between Sears Point and Mare Island was plagued with fatal accidents, earning its nickname of "Blood Alley". Between 1966 and 1970, 27 people lost their lives to it. In a preliminary effort to reduce the fatalities, officials established both a daylight test section, requiring all cars to keep their headlights on during the day, and passing lanes. However, these efforts were ineffective.
In 1993, local resident Jim Poulos campaigned to have a barrier erected after the death of his 18-year-old son, Frankie, on "Blood Alley". At this time, the situation with this stretch only worsened as the death toll between 1990 and 1996 rose to thirty-one. At first, Caltrans thought the barrier would make matters worse since it would be difficult for emergency vehicles to attend to accidents; environmental issues were also cited. Caltrans was waiting for the ability to create a causeway to span the area instead. Poulos continued his campaign despite opposition, and was granted the barrier in 1995. The barrier was not built without controversy, as it also eliminated the passing lanes. However, since the barriers were built, there were no longer any crossover accidents as of 2005.
While the median was built, a few problems needed to be resolved in order for the road to work both safely and in an environmentally friendly way. Emergency personnel needed to quickly access accidents and provide them easy transport to nearby hospitals. To alleviate this problem, Caltrans implemented electric gate technology, which would allow emergency vehicles to cut through certain parts of the median. The other problem was to both protect the plant life and the salt harvest mice residing around the highway. As a result, crews placed timbers and sheeting to protect foliage, and added holes into the median barrier to allow the mice to cross the highway.
White Slough and Sonoma Boulevard interchange
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.
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.
|Novato||R11.20||—||South Novato Boulevard||Continuation beyond US 101|
|—||US 101 – Santa Rosa, Eureka, San Rafael, San Francisco|
|11.50||—||Marsh Drive, Hanna Ranch Road|
|East end of freeway|
|13.77||Atherton Avenue – Black Point|
|14.47||Harbor Drive||No eastbound exit|
|Sears Point||3.90||SR 121 (Arnold Drive) – Napa, Sonoma||Serves Sonoma Raceway|
|West end of freeway|
|R7.39||Mare Island Bridge over Napa River|
|8.01||18||Wilson Avenue, Sacramento Street||Signed as Wilson Avenue eastbound|
|9.52||19||SR 29 (Sonoma Boulevard) – Napa, Downtown Vallejo|
|10.96||20||Fairgrounds Drive – Discovery Kingdom|
|R12.00||21||I-80 – Sacramento, San Francisco||Eastbound exit and westbound entrance; signed as exits 21A (west) and 21C (east)|
|21B||Auto Mall Columbus Parkway||Eastbound exit and westbound entrance|
|1.000 mi = 1.609 km; 1.000 km = 0.621 mi
- LeBaron, Gaye (September 10, 1995). "The Damp and Difficult History of Highway 37". Santa Rosa Press Democrat. p. A2. "Some of Marin's problem was solved in 1917 with the opening of the Black Point Cut-Off, a straight-on stretch of roadway bordering the tidelands from Ignacio on the San Rafael to Santa Rosa north-south road to the little town of Black Point on the Sonoma–Marin county line, connecting with Route 8, (now Highway 121) the road from Napa by way of Schellville, which had been taken into the state system in 1909."
- Staff. "State Truck Route List" (XLS file). California Department of Transportation. Retrieved August 21, 2012.
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- Gafni, Matthias. "'Perserverance' at a high price". Vallejo Times Herald (ANG Newspapers). Archived from the original on November 21, 2006. Retrieved September 24, 2009.
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- "CA Codes (shc:260-284)". California State Legislature. Retrieved May 17, 2008.
- "Officially Designated State Scenic Highways and Historic Parkways". California Department of Transportation. December 7, 2007. Retrieved June 22, 2011.
- California Streets and Highways Code, Chapter 2, Article 3, Section 635
- State of California Department of Public Works. Road Map of California 1936 (Map). http://www.cosmos-monitor.com/ca/map1936/insets/sf-vicinity-plus-monterey-co.html.
- State of California Department of Public Works. Road Map of California 1956 (Map). Cartography by Highways Division. http://www.cosmos-monitor.com/ca/map1956/insets/sf-bay-inset.html.
- "Golden Gate Ferries, Inc.". Berkeley Daily Gazette. October 1, 1927. Retrieved April 22, 2013.
- California State Legislature (1984). "An act...relating to state highways". State of California. 1984 chapter 409.
- California State Legislature (1963). "An act...relating to routes on the state highway system". State of California. 1963 chapter 385.
- "Award Contract on Sears Point Cut-off". Berkeley Daily Gazette. October 1, 1926. Retrieved April 22, 2013.
- "Ask Showdown on Sears Point Road". Berkeley Daily Gazette. United Press International. November 29, 1932. Retrieved April 22, 2013.
- "Sears Point Road Status Undecided". Berkeley Daily Press. United Press International. June 17, 1936. Retrieved April 23, 2013.
- "Sears Point Road Acquisition Aided". Berkeley Daily Gazette. United Press International. October 14, 1938. Retrieved April 23, 2013.
- "Ask Showdown on Sears Point Road". Berkeley Daily Gazette. United Press International. September 14, 1936. Retrieved April 22, 2013.
- "Approves Toll Road Purchase". Berkeley Daily Press. United Press International. October 25, 1938. Retrieved April 23, 2013.
- "'Experimental idea: Daylight Headlight Test fails to return the expected results". Vallejo Times Herald (ANG Newspapers). Archived from the original on July 22, 2006. Retrieved April 21, 2013.
- "Crews improvise to erect Highway 37 median". Vallejo Times Herald (ANG Newspapers). Archived from the original on November 21, 2006. Retrieved April 21, 2015.
- "California Government Code Section 66670-66682". Retrieved April 2, 2013.
- Cobb, Steve (August 14, 2005). "Route 37 Traffic Switch onto New Alignment Starts Tonight in Vallejo" (PDF) (Press release). California Department of Transportation. Retrieved January 11, 2008.
- Staff (July 2007). "Log of Bridges on State Highways". California Department of Transportation.
- Staff (2005 and 2006). "All Traffic Volumes on CSHS". California Department of Transportation.
- Warring, KS. "Route 37" (PDF). California Numbered Exit Uniform System. California Department of Transportation. Retrieved February 2008.
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