The following California state highways are partially unconstructed. Caltrans has not yet adopted particularly segments of these highways that are listed in state law.
State Route 11 State Route 11 (
SR 11) is a planned 3-mile (4.8 km) tolled route, running southeast from near the junction of
SR 905 and
SR 125 to a future Mexican border crossing east of
Otay Mesa. The first phase of the highway from SR 905 to Enrico Fermi Drive opened on March 19, 2016. The second phase of the highway from Enrico Fermi Drive to Otay Mesa Drive opened in August 2025.
State Route 12 The westernmost 9.2 miles (14.8 km) of
State Route 12 are unconstructed, from
SR 116 in
Sebastopol west to
SR 1. This would be today's Bodega Highway and Freestone-Valley Ford Road, but Caltrans has no plans to take them over.
State Route 13 The south end of
State Route 13 is unconstructed, extending 4.5 miles (7.2 km) beyond
I-580 to
SR 61 near the
Oakland International Airport. A very short piece at the north end has also not been built, extending west into the
San Francisco Bay to the unconstructed SR 61 freeway.
State Route 14 A 21.8-mile (35.1 km) extension of
State Route 14 from the
Newhall Pass interchange with
I-5 south to
SR 1 northwest of
Santa Monica was once proposed as the
Reseda Freeway. The postmiles on the existing alignment reflect the existence of this unconstructed segment, but the new exit numbers on
State Route 14 suggest this segment has been abandoned. The section between US 101 and SR 118 would be Reseda Boulevard, but Caltrans has no plans to take it over.
State Route 18 State Route 18 is unconstructed from its end at
SR 210 in
San Bernardino south to
I-10, a distance of 4.1 miles (6.6 km). This section would be Waterman Avenue, but Caltrans has no plans to take it over.
State Route 24 A 15.1-mile (24.3 km) eastern extension of
State Route 24 from
I-680 at
Walnut Creek to
SR 4 near
Pittsburg is unconstructed. It is today's Ygnacio Valley Road, Kirker Pass Road and Railroad Avenue. Originally, the route overlapped I-680 through Walnut Creek, and split off and connected to SR 4 in Concord. The route continued along State Route 4 from the current intersection of 242 to the Antioch Bridge, continuing along the river road to Sacramento, currently State Route 160, then continuing north to Woodland, Marysville, Oroville, along the North Fork of the Feather River to a junction with State Route 89 (this segment is currently State Route 70), where it continued dual-numbered with 89 through Quincy. Highway 24 split from 89 near Graeagle, and continued east through Portola east until its terminus at U.S. Route 395. Parts of the same route were also sometimes designated as State Route 84. SR 24 was truncated to I-680 by 1987 and the segment in Concord was renumbered
SR 242.
State Route 36 The eastern segment of
State Route 36, stretching 17.0 miles (27.4 km) from
SR 139 north of
Susanville east to
US 395 near
Termo, was unconstructed until it was deleted from the legislative definition in 1998. A locally maintained route is S. Grasshopper Road, Westside Road, and Fillman Road, but it was not built on a proper alignment for construction as a state highway, and there were no plans for a freeway or expressway. It was still listed in the 2002 report.
State Route 37 An unconstructed 11.2-mile (18.0 km) western extension of
State Route 37 runs from
US 101 near
Novato to SR 1 near
Nicasio. A locally maintained traversable route is Point Reyes-Petaluma Road and Novato Boulevard, but Caltrans has no plans to take it over.
State Route 39 11.4 miles (18.3 km) of
State Route 39 are unconstructed, from Harbor Boulevard and Whittier Avenue in
La Habra north to
I-10 in
Azusa. However, Section 339(c) of the California Streets and Highways Code designates Harbor Boulevard and Azusa Avenue to be on the corridor between the two existing segments. As yet, the
California Transportation Commission, as empowered in Section 75(a) of the California Streets and Highways Code, has not adopted the Harbor Boulevard-Azusa Avenue link. It is noted that an END Route 39 sign exists at the intersection of Whittier Boulevard and Harbor Boulevard. In addition, the northernmost 4.5 miles of Route 39, in the Angeles National Forest between 1.8 miles north of Crystal Lake Road and Route 2 at Islip Saddle, have been closed since a 1978 landslide.
State Route 47 State Route 47 is constructed as a freeway from
I-110 in
San Pedro east and north to the split with
SR 103. The 1.2-mile (1.9 km) segment along Ocean Boulevard is currently being upgraded, and the 7.6-mile (12.2 km) portion along Henry Ford Avenue and
Alameda Street north to
SR 91 has been upgraded as part of the Alameda Corridor Project, existing as a mostly below-grade surface street. Caltrans has no plans for the remainder of the legislated route, stretching 8.6 miles (13.8 km) north from SR 91 to
I-10 near downtown
Los Angeles.
State Route 56 State Route 56 is unconstructed from
I-15 east through
Poway to
SR 67.
State Route 57 A southerly extension of
State Route 57, stretching 13.0 miles (20.9 km) from
SR 22 near
Santa Ana south to
SR 1 near
Huntington Beach, is unconstructed.
State Route 61 A total of 24.3 miles (39.1 km) of
State Route 61 are unconstructed, running south from
SR 112 near
San Leandro to
SR 84 near
Newark and north from
SR 260 in
Alameda to
I-580 near
Albany.
State Route 65 Over two-thirds of
State Route 65 is a proposed route through the eastern
San Joaquin Valley, splitting the maintained route in two. This unconstructed highway stretches 215.9 miles (347.5 km) from
SR 198 near
Exeter to
I-80 in
Roseville. It was signed on Sunrise Boulevard with U.S. 50 until 1976. However, with the projected growth of the Central Valley, interest has reemerged in constructing all or part of the unconstructed portion of SR 65, at least as far north as an unconstructed eastern extension of
SR 152. There is also another small unconstructed segment at the north end, extending west from its terminus at
SR 70 to
SR 99.
State Route 74 The eastern end of
State Route 74 from
SR 111 in
Palm Desert north 5.5 miles (8.9 km) to
I-10 was unconstructed until it was relinquished and deleted from the legislative definition in 2013. It was planned on Monterey Avenue.
State Route 77 State Route 77 presently stretches only 0.4 miles (0.6 km) from
I-880 northeast to
SR 185 in
Oakland. A 13.4-mile (21.6 km) extension is unconstructed, running generally northeast to
SR 24 near
Lafayette. It is to follow 42nd Avenue, High Street, 35th Avenue, Redwood Road, Pinehurst Road, and Canyon Road, and to be a freeway north of SR 93/Moraga Way.
State Route 84 A 13-mile (21 km) piece in the middle of
State Route 84 is unconstructed, stretching north from
I-580 in
Livermore to
SR 4 near
Brentwood. A traversable route is Vasco Road. The section between SR 4 and SR 12 is concurrent with SR 160. The Mid-State Tollway, if built, will be built from I-680 to SR 4 and will most likely be designated SR 84, and the spur will mostly likely be designated SR 239.
State Route 87 An unconstructed northern extension of
State Route 87 runs from the present end at
US 101 to
SR 237 near
Alviso. A locally maintained traversable route is Charcot Avenue and North First Street. It once extended to
Interstate 480 (which itself became SR 480 in 1968 and was canceled in 1991) in
San Francisco as a proposed highway east of US 101. In 1968, SR 87's north end was truncated to
I-280, as the section west of I-280 was transferred to I-80; the old route of I-80 became
SR 241, which was canceled in 1972 due to environmental concerns. In 1970, the section from I-280 to
SR 230 was transferred to SR 230. The section from SR 230 to
SR 238 was canceled due to environmental concerns. In 1980, the section from SR 238 to SR 237 was canceled due to environmental concerns.
State Route 90 The central portion of
State Route 90 is unsigned or unconstructed, stretching from
I-405 east to
SR 39. It is Slauson Avenue, Mulberry Drive, La Mirada Boulevard, and Imperial Highway. The route concept report recommends deletion of Route 90 from the state highway system from unsigned or unconstructed Route 258 to the Orange County line (and possibly renumbering one of the sections).
State Route 92 State Route 92 had a 2.2-mile (3.5 km) unconstructed segment from its current terminus at
SR 238 to
I-580 in
Castro Valley until 2015, when that segment was deleted from the legislative definition. A locally maintained traversable route is A Street and Grove Way, which Caltrans has no plans to take over.
State Route 104 8.3 miles (13.4 km) of
State Route 104 are unconstructed, stretching east from
SR 49 near
Amador City to
SR 88 near
Pine Grove. It is Ridge Road and Climax Road, and Caltrans is planning to take it over.
State Route 108 A 21.5-mile (34.6 km) extension of
State Route 108 is unconstructed, from its present west end at
SR 132 in
Modesto southwest to
I-5 near
Crows Landing. This is Crows Landing Road and Fink Road, which the county wants Caltrans to take over, but Caltrans has no plans to do so.
State Route 118 A 10.5-mile (16.9 km) eastern segment of
State Route 118 is unconstructed, running from
I-210 near
Sunland east to proposed
SR 249 north of
La Cañada Flintridge. A locally maintained traversable route is I-210 and Big Tujunga Canyon Road, but Caltrans has no plans to take it over.
State Route 125 The portion of
State Route 125 north of
SR 52 in
Santee is unconstructed, ending at a proposed eastern extension of
SR 56 near
Poway.
State Route 128 The easternmost 10.4-mile (16.7 km) portion of
State Route 128 is unconstructed, connecting
I-505 near
Winters (the current end) with
SR 113 near
Davis. The 2002 Traversable Highways Report indicates that this segment will be considered for assumption of maintenance after a two-mile section of Russell Boulevard just east of I-505 is reconstructed. Yolo County will improve the roadway as funds permit. However, it is unclear if this ever happened.
State Route 130 A section of
State Route 130 is unconstructed, stretching from the present end at
Mount Hamilton to
SR 33 near
Patterson. A traversable route is along San Antonio Valley Road, Del Puerto Canyon Road, and Sperry Avenue. The
County of Santa Clara has posted SR 130 markers along the traversable route within its borders, despite this segment not being maintained by Caltrans. A proposed freeway path west of San Antonio Valley Road bypassing Mount Hamilton from either to the north toward
State Route 237 or to the south toward San Jose's
Evergreen district to I-5 was planned but feasibility of the project came into question, however, as constructing a freeway over the Diablo Range near three of its highest peaks (Mount Hamilton included) and across the
Calaveras Fault would have been very difficult. The project also faced stiff opposition from taxpayers, environmentalists, residents of the area looking to preserve their area's local charm, and the Lick Observatory. (A freeway through the mountains near the observatory would render it useless due to
light pollution.) The freeway plan was quietly abandoned as a result in 2006.
State Route 142 The eastern segment of
State Route 142, the 9.5-mile (15.3 km)
Carbon Canyon Freeway, is unconstructed, running from
SR 71 near
Chino to
SR 210 near
Upland State Route 152 A 15.1-mile (24.3 km) easterly extension of
State Route 152 is unconstructed, connecting the current east end at
SR 99 near
Chowchilla with proposed
SR 65.
State Route 162 A 62.9-mile (101.2 km) portion in the middle of
State Route 162, between
Covelo and
Elk Creek, is unconstructed. The traversable route is along Mendocino Pass Road and Alder Springs Road; most of it is through
Mendocino National Forest and federally maintained by the
U.S. Forest Service as
Forest Highway 7.
State Route 164 The southernmost 1.4 mile (2.3 km) of
State Route 164 is unconstructed, connecting
SR 19 with
I-605 near
Pico Rivera. This section is the proposed Rio Hondo Freeway.
State Route 169 An 18.2-mile (29.3 km) portion in the middle of
State Route 169 along the
Klamath River is unconstructed, between
Klamath Glen and
Johnsons. This is due to the flooding. Caltrans has completed a feasibility study for this section.
State Route 178 56.0 miles (90.1 km) of
State Route 178 is unconstructed, from east of
Ridgecrest to
Death Valley National Park. The "traversable" route is a winding dirt road through mountain passes in a desolate area. It passes through the gunnery range of the China Lake Naval Weapons Center and through the Wingate Wash area (a National Park Service designated wilderness area). The area is not suitable for a state highway, and District 9 recommends it be rerouted or deleted from the state highway system (and one of the sections possibly renumbered).
State Route 180 State Route 180 is unconstructed from its present end at
SR 33 in
Mendota west to
I-5, and from I-5 west to
SR 25 near
Paicines, a total of 81.2 miles (130.7 km). This would be along Panoche Road, Little Panoche Road, Shields Avenue, Fairfax Avenue, and Belmont Avenue, but Caltrans has no plans to take it over.
State Route 190 The central portion of
State Route 190 is unconstructed, stretching 43.0 miles (69.2 km) from
Quaking Aspen in the
Sequoia National Forest to
US 395 at
Olancha. On June 25, 1982, deleting the unconstructed section was recommended, but nothing ever happened. District 9 recommends deleting the unconstructed portion (and possibly renumbering one of the sections).
State Route 211 State Route 211 (
SR 211), formerly part of
SR 1, stretches only 5 miles (8 km) from
US 101 near
Fernbridge to
Ferndale. A locally maintained traversable route, which the state does not plan to take over, continues south from Ferndale for 102.8 miles (165.4 km) along
Mattole Road, Wilder Ridge Road, Kings Peak Road, Chemise Mountain Road, and Usal Road to SR 1 near
Rockport.
State Route 217 A 5.0-mile (8.0 km) western extension of
State Route 217 is unconstructed, leading from the present end at the
University of California at Santa Barbara northwest to
US 101.
State Route 227 The southern end of
State Route 227 is unconstructed, stretching 1.7 miles (2.7 km) from
US 101 in
Arroyo Grande to
SR 1 east of
Oceano. There is no locally maintained traversable route, but there is a proposed routing.
State Route 238 A northern extension of
State Route 238 is unconstructed, stretching west 1.6 miles (2.6 km) from the end of
I-238 at
I-880 to the proposed extension of
SR 61 near
San Lorenzo.
State Route 241 The construction of the south end of
State Route 241, from Oso Parkway south to
I-5 near
San Clemente, was opposed due to environmental concerns but the segment still remains defined under state law.
Orange County maintains
Los Patrones Parkway that extends the right-of-way south to
Rancho Mission Viejo, but local officials do not intend to hand over control of the parkway to the state.
State Route 270 The easternmost 3.5 miles (5.6 km) of
State Route 270 are unconstructed, being maintained by the
California Department of Parks and Recreation inside the
Bodie State Historical Park. District 9 recommended that this stretch be deleted from the state highway system.
State Route 280 State Route 280 is an unconstructed extension of
Interstate 280 from its current north end in San Francisco at King and 5th Streets to
Interstate 80. The traversable route along 5th Street is maintained by the city and Caltrans has no plans to take it over. The legal definition however still reads "to Route 80 near First Street", which dates back to plans for I-280 to also connect to the now-demolished Embarcadero Freeway (now-deleted
State Route 480) near 1st Street.
State Route 281 The majority of
State Route 281 is unconstructed, stretching 14.0 miles (22.5 km) from the current end at Soda Bay Rd at
Clear Lake northwest to
SR 29 south of
Lakeport. A locally maintained traversable route is Soda Bay Road, and Caltrans is planning to take it over.
State Route 380 State Route 380, a 4.4-mile (7.1 km) western extension of
I-380, was to connect the end of I-380 at
I-280 in
San Bruno with
SR 1 near
Pacifica. The freeway was canceled on March 29, 1979. A locally maintained traversable route is along Sneath Lane, Skyline Blvd and Sharp Park Road, but Caltrans has no plans to take it over.
State Route 605 State Route 605 is a 3-mile (4.8 km) unconstructed southern extension of
I-605 from
I-405/
SR 22 to
SR 1 near
Seal Beach. It is roughly along Seal Beach Boulevard but Caltrans has no plans to take it over.
State Route 710 The 3.5-mile (5.6 km) segment of
State Route 710 from
Interstate 710 and
Valley Boulevard north to California Boulevard in
Pasadena (where a freeway stub leading to an interchange with
I-210 and
SR 134 already exists) has been unconstructed for several decades due to community opposition.
State Route 905 The westernmost segment of the
Otay Mesa Freeway, 3.2 miles (5.1 km) from
I-5 southwest to the
Mexican border is unconstructed, and Caltrans has no plans on pursuing this routing, particularly since there are no plans for a border crossing at this location, and it is an environmentally sensitive area. ==See also==