Unconstructed state highways in California
The following state highways in the U.S. state of California are entirely or partially unconstructed; in other words, their routings have been defined by state law, but no route has been adopted by the California Department of Transportation (Caltrans).
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.
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 post miles 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 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.
11.4 miles (18.3 km) of State Route 39 are unconstructed, from 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 Fullerton Road. 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 is constructed as freeway from I-110 in San Pedro east to the east end of the Vincent Thomas Bridge and from I-710 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.
SR 48 was originally planned to run from Ridge Route Road (approximately four miles east of Interstate 5) near Quail Lake in Los Angeles County to SR 122 near the Los Angeles / San Bernardino County Line. The segment between Ridge Route Road and SR 14 was signed as SR 138, which was defined on a southeastely course through or paralleling Oakdale and Pine Canyons to meet SR 14 in Palmdale opposite the easterly continuation of Route 138. The planned rerouting was known as the Metropolitan Bypass Freeway. In the mid 1960s, because of constructability issues on the proposed realignment of Route 138 through or near Oakdale and Pine Canyons, the proposed junction, and thus the west end of SR 48, was moved east to 170th Street West. In 1995, the segment of SR 48 between 170th Street West and SR 14 was transferred to SR 138, leaving only the unconstructed portion.
|← SR 47||SR 49 →|
State Route 64 is an unconstructed 30-mile (48.3 km) freeway connecting SR 1 near Malibu Beach with I-5 at SR 170 south of San Fernando. It was legislated in 1959 as Route 265, and renumbered Route 64 in 1964.
|← SR 63||SR 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 near Roseville.
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.
State Route 81 is an entirely-unconstructed 30.9-mile (49.7 km) freeway from I-215 southeast of Riverside west and north around the south and west sides of Riverside to I-15 south of Devore. It was defined in 1959 as Legislative Route 276 and renumbered to Route 81 in 1964.
|← I‑80||SR 82 →|
|← SR 99||US 101 →|
State Route 102 is a 37.5-mile (60.4 km) unconstructed freeway that would generally parallel I-80, beginning at I-5 near SR 99 north of Sacramento and heading east across I-80 and northeast to I-80 near Auburn.
|← US 101||SR 103 →|
|← SR 121||SR 123 →|
|← SR 142||SR 144 →|
|← SR 147||SR 149 →|
The southerly section of State Route 170 is the 4.5-mile (7.2 km) unconstructed Skyway Freeway, which would link Los Angeles International Airport with SR 90. The segment between SR 90 and SR 2 does not have a current routing. The portion of La Cienega Blvd. built to expressway standards was likely intended to be part of this routing.
State Route 179 is an entirely unconstructed 13.8-mile (22.2 km) route connecting I-80 near Vacaville with SR 128 near Lake Berryessa. A locally maintained traversable route has been defined via Cherry Glenn Road and Pleasants Valley Road.
|← SR 178||SR 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). The latter segment would be along Panoche Road, but Caltrans has no plans to take it over.
State Route 181 is a 9.5-mile (15.3 km) route, entirely unconstructed, following Mirabel Road and River Road from SR 116 near Forestville to US 101 north of Santa Rosa. Caltrans has no plans to take it over.
|← SR 180||SR 182 →|
State Route 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 230 is a 4.1-mile (6.6 km) completely unconstructed route in southeastern San Francisco and San Mateo County, linking US 101 with I-280 along the San Francisco Bay. Except for the southern end, the route was part of SR 87 until 1970, when SR 87 was cancelled north of SR 237. Some of the plans for a Southern Crossing across the bay would have used SR 230.
|← SR 229||SR 231 →|
State Route 234 and State Route 235 are unconstructed southern and northern bypasses of Stockton, each linking I-5 with SR 99. Caltrans has no plans to build either, but has identified locally-maintained traversable routes: French Camp Road for the 3.4-mile (5.5 km) SR 234, and Eight Mile Road for the 6.4-mile (10.3 km) SR 235.
|← SR 233||SR 236 →|
State Route 239 is a 17-mile (27.4 km) unconstructed route that would link I-580 at I-205 west of Tracy with SR 4 near Brentwood. Caltrans has identified Mountain House Road and Byron Highway (CR J4) as a traversable route, but has no plans to maintain it. In 2005, the federal legislation known as SAFETEA-LU provided $14 million for the purpose of studying the route's corridor and funding its construction.
|← SR 238||SR 241 →|
Until 1994, State Route 244 included an unconstructed extension from Auburn Boulevard east to Fair Oaks Boulevard in Sacramento County.
State Route 249 is a 13.5-mile (21.7 km) unconstructed route that would connect SR 2 north of La Cañada Flintridge with SR 14 south of Palmdale. Angeles Forest Highway (CR N3) follows the general alignment, but Caltrans has no plans to take it over.
|← SR 247||SR 251 →|
State Route 251 is a completely unconstructed route, defined to extend from I-580 near Point San Quentin to SR 1 near Point Reyes Station. The 1.6-mile (2.6 km) portion east of US 101 has a locally maintained traversable route on Sir Francis Drake Boulevard, and Caltrans is rebuilding it with the intent to adopt it. The rest is the proposed 22.9-mile (36.9 km) Point Reyes Freeway, and was part of SR 17 until 1984, when SR 17 over the Richmond-San Rafael Bridge became I-580.
Sir Francis Drake Boulevard roughly parallels the highway's length. If built, the highway was probably going to be called the "Point Reyes Freeway"; extra flyover ramps at the Sir Francis Drake Boulevard-U.S.-101 interchange suggest this.
The freeway was born due to an idea to develop west Marin County, a traditionally rural area, into a sprawling area not usually found in Marin County. With all the new residents, local roads would have been overburdened. Chief among them was Sir Francis Drake Boulevard, a two lane road from Olema to Fairfax before widening to 4 lanes as it passes through the Ross Valley.
However, the development and freeway planning were stopped due to concerns about fragile ecosystems that urbanization would have damaged or destroyed. The animals, mostly egrets and the California red-legged frog ended up being the main reason the freeway and redevelopment was defeated. There was another problem though: the plan put the entire area on the San Andreas Fault. The decision to not redevelop West Marin made the freeway unnecessary, and it was therefore scrapped.
|← SR 249||SR 253 →|
State Route 257 stretches 19.6 miles (31.5 km) from a proposed relocation of SR 34 east of Port Hueneme west and northwest around Oxnard to US 101 near Ventura. 5th Street and Harbor Boulevard has been identified as a traversable routing, but Caltrans has no plans to maintain the streets.
|← SR 255||SR 258 →|
|← SR 257||SR 259 →|
State Route 276 is an 8.5-mile (13.7 km) unconstructed route from SR 198 near Three Rivers east to Sequoia National Park. It initially stretched further east through the park (though it was not part of the park at the time) to Mineral King, where the Walt Disney Company planned to build a recreational development.
|← SR 273||I‑280 →|
The southernmost segment of Interstate 710, 3.5 miles (5.6 km) from SR 1 south and west to SR 47 on Terminal Island recently added to the legislative definition, is currently being upgraded. At the northern end, 3.5 miles (5.6 km) from 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, although Caltrans continues to study alternative alignments.
The westernmost segment of State Route 905, 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.
- California Department of Transportation, State Highway Routes: Selected Information, 1994 with 1995 revisions
- California Department of Transportation, Traversible Highways Report 2002 [sic]