The California Transportation Commission has approved the relocation of CA 58 between I-5 and CA 99, from the McKittrick and Rosedale Highways and part of CA 43, south to parts of the Stockdale Highway (county road) and the Westside Parkway (locally-maintained freeway, already in the usasf route set). See https://www.cahighways.org/ROUTE058.html for all the mind-numbing details.
Part of the Westside Parkway hasn't yet been adopted into the state highway system (apparently because Caltrans thinks the part east of Coffee Rd. needs improvements before it can be adopted at a later date), and the easternmost part completing the Parkway's connection to CA 99 and the rest of CA 58 is still under construction. I'll take some time to figure out how and when to implement the reroute in the HB. That might include a split of CA 58, a Buttonwillow segment between US 101 and Coffee Rd. in Bakersfield, and a Tehachapi segment between CA 99 and I-15, until the gap between those segments is filled.
Is there a chance it could be like other routes that despite having non-Caltrans gaps, are still signed by a local jurisdiction & this included as one piece?
Caltrans' Postmile Query Tool now shows CA 58 following the two-lane Stockdale Highway from I-5 to the Westside Parkway, and most of the Westside Parkway (previously a county freeway) to the Coffee Rd. interchange. However, multiple freeway entrance signs shown in March 2022 GMSV indicates CA 58 not only includes the Parkway to Coffee Rd., but continues one more interchange east, to Mohawk St.
The PQT is consistent with Caltrans' formal adoption of the Westside Parkway into the state highway system only to Coffee Rd., as well as the Stockdale Hwy. from I-5 to the Westside Parkway. But while the PQT shows the Stockdale Hwy. as part of route 58, March 2022 GMSV imagery shows no CA 58 signs on the Stockdale Hwy., or on I-5 at or north of the Stockdale junction. This might be that the existing Stockdale Hwy. is planned to be just a temporary CA 58 alignment, to be replaced someday with a new alignment between I-5 and the Westside Pkwy.
Most of the existing CA 58 (Hageman Rd. and Rosedale Hwy.) between I-5 and CA 99 has been relinquished to the city of Bakersfield or Kern County, except the short section between Mohawk St. and CA 99, and the shorter section concurrent with CA 43. This confirmed by the PQT. State law includes the usual requirement that the local government maintain continuation signage to the rest of route 58. Some CA 58 signage has been removed, but some remains on the concurrency with CA 43 about midway between I-5 and CA 99. There also are no End signs confirming that the relinquished segments are no longer part of CA 58, like
the one on CA 160 at the southern Sacramento city limit.
There remains an unbuilt gap between the east end of Westside Parkway and the southern CA 58/99 junction. This segment, called the Centennial Corridor, is being built for Caltrans, with expected completion in mid-2023.
For more, see Daniel Faigin's
California Highways page on route 58.
My suggested fixes:
-- In keeping with yakra's suggestion, leave the existing CA 58 route file as is, to maintain route continuity while the Centennial Corridor is under construction.
-- Add a separate new CA 58 segment (ca.ca058wes), including the part of the Westside Parkway west of Coffee Rd., but not the Stockdale Hwy. between I-5 and the Westside Pkwy.
-- Leave the Westside Pkwy. in the HB as an active route in the U.S. Select Named Freeways (usasf) route set, partly concurrent with the new CA 58 segment.
All this will change (hopefully next year) with the completion of the Centennial Corridor, linking the Westside Pkwy. to CA 99 and points east on existing CA 58. This would create a continuous state-maintained CA 58 from US 101 to I-15, bypassing CA 58's old Rosedale Hwy. alignment.
