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In 1965, Chapter 2007 simplified the wording of the origin: "Route 1 near
north of the intersection of Sunset Boulevard and
Route 1...". In 1981, Chapter 292 simplified the wording of the
terminus: "Route 118 at or near Chatsworth".
Topanga Canyon originally terminated at Santa Susana Pass Road (in fact, it was known as Santa Susana Road N of Devonshire). The extension N of Devonshire St. from just S of the SP Railroad "S" curve to the new freeway was completed in 1966; this extension climbs an 8% grade to an elevation of 1,232'. Topanga Canyon Blvd was rerouted sometime in the 1960s between Plummer and Marilla Street. The original routing was along what is now Topanga Canyon Place, and went first W of the current route, crossed the current route, and then looped E and back to the current route shortly N of Marilla Street. This was to avoid a hill that was later taken down. However, the Plummer to Topanga intersection was constructed in the 1980s or 1990s.
There also appears to be rerouting between Roscoe and Nordhoff, as well as slightly around Oxnard. The original terminus was Devonshire Street, where it met Route 118 and continued N and then W as Santa Susana Ave.
There is an "Old Topanga Canyon Road" that splits off Topanga Canyon Road in the community of Topanga, and continues on a more westerly and winding route, meeting Mullholland Drive near Valley Circle. This does not appear to have ever been a part of Route 27 or LRN 156.
In April 2013, it was reported that the Los Angeles County Board of Supervisors has asked the state to designate the portion from Route 1 to the Ventura County line as a state scenic highway (essentially, the entire route).
In August 2016, the CTC approved $31,477,000 for Los Angeles 07-LA-118 R0.0/R14.4 Route 118 in the city and county of Los Angeles, from Ventura County line to Route 210; also on Route 27 (Topanga Canyon Boulevard) from Devonshire Street to Route 118. Outcome/Output: Rehabilitate 65.0 lane miles of roadway to extend pavement surface life and improve ride quality. Replace approach slabs and upgrade curb ramps to meet current ADA standards.
[SHC 263.3] From Route 1 to Mulholland Drive.
June 2017, it was reported that Topanga Canyon Blvd had received a state
scenic highway designation: "Topanga Canyon State Scenic Highway, a 2.5
mile (although another article says 3.5 mi) segment of Route 27, runs
through the county and city of Los Angeles in the Santa Monica Mountains
National Recreation Area near the Pacific coast." The LA Times clarified
that the designation is from Mile 1 to Mile 3.5 (near Old Topanga Blvd),
putting it within the SHC 263.3 designation. The new scenic highway runs
parallel to Topanga Creek, with views of massive rock formations, valleys,
mountains, and a diversity of plants and animals. California’s
scenic state highway program was implemented in 1963 in order to
“add to the pleasure of state residents,” and “encourage
the growth of recreation and tourist industries.” Designated scenic
highways, along with adjacent scenic corridors, require special
conservation treatment. Scenic corridors consist of land that can be seen
from the scenic highway and is next to the highway, even if it is outside
the highway right-of-way. The legislation lets the state assign
responsibility for the regulation of land use and development along scenic
highways to the appropriate state, local and county agencies. “The
city or county must also adopt ordinances, zoning and/or planning policies
to preserve the scenic quality of the corridor or document such
regulations that already exist in various portions of local codes,”
Caltrans specifies. According to Westways magazine, this was the first LA
County road to receive the state scenic highway designation in 45 years.
It was reported as the culmination of a five-year effort by Topanga
Chamber of Commerce members Joseph Rosendo and Roger Pugliese, along with
the Topanga Association for a Scenic Community working with county and
city officials to develop a scenic corridor protection program. The new
Topanga Canyon State Scenic Highway travels through a portion of Topanga
State Park, which features 36 miles of trails through open grassland and
live oaks, and spectacular views of the Pacific Ocean,” it said.
“The park is one of the world’s largest wildlands within the
boundaries of a major city.”
(Source: OneTopanga, 6/17/2017; LATimes, June 2017; Caltrans; Malibu Times, 10/20/2017)
Overall statistics for Route 27:
The route that was to become LRN 27 was first defined in the 1916 Second Bond Issue as part of the "extension of the San Bernardino county state highway lateral to the Arizona State Line near the town of Yuma, Arizona, via the cities of Brawley and El Centro in Imperial County by the most direct and practical route...". LRN 26 took the portion from the San Bernardino County lateral (LRN 9) down through Brawley and El Centro. LRN 27 then continued E-ly from El Centro to Yuma Arizona. (LRN 26 continued S to Calexico as part of LRN 26's 1931 extension)
In 1935, LRN 27 was codified into the highway code as running from El Centro to Yuma, and was all primary state highway. The definition remained unchanged until 1963 and the great renumbering. This route was signed as US 80, and is present-day I-8.
Acronyms and Explanations:
Route 26 Route 28
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