California State Route 243
state highway in Riverside County, California, United States
State Route 243 (SR 243) is a 30-mile (48-kilometer) two-lane state highway in Riverside County, California, that runs from SR 74 in Mountain Center to Interstate 10 (I-10) in Banning. Known as the Banning-Idyllwild Panoramic Highway, it also provides access to Idyllwild and the San Bernardino National Forest. The road from Banning to Idyllwild originally opened by 1910, and was added to the state highway system in 1970. The highway was later also designated as the Esperanza Firefighters Memorial Highway in honor of firefighters who died while fighting the 2006 Esperanza Fire.
Route description
Route 243 is defined in section 543 of the California Streets and Highways Code, and that the highway is "from Route 74 near Mountain Center to Route 10 near Banning".
SR 243 begins at SR 74 in the San Jacinto Wilderness near Mountain Center, Riverside County as Idyllwild Road. The highway traverses north along a winding road through the community of Idyllwild. SR 243 makes a left turn at the intersection with Circle Drive and continues through Pine Cove. The road continues through the forest past Mount San Jacinto State Park through Twin Pines and the Morongo Indian Reservation before making a few switchbacks and descending en route to the city of Banning as the Banning Idyllwild Panoramic Highway. The highway continues as San Gorgonio Avenue into the city before making a left onto Lincoln Street and a right onto 8th Street and terminating at a diamond interchange with I-10.
The public source identifies “California State Route 243” as state highway in Riverside County, California, United States. This brief keeps that definition visible, then builds a research path around California, State and Route.
Why this record matters
A short description can identify a subject without explaining its stakes. For “California State Route 243”, the useful work is to connect “state highway in Riverside County, California, United States” to the records capable of establishing context and consequence.
Maps, plans, fabric surveys and administrative records can establish how the site’s name, extent and function changed over time. The source revision retrieved here is dated Sep 11, 2026. The linked authority identifier is Q624133. Authority coordinates are 33.848, -116.820. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank. The first chronological checks are 1910, 1970 and 2006.
Modern boundaries and familiar names can conceal earlier jurisdictions or structures that do not align with the present site. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
How to read it
Treat names, boundaries and functions as historically changeable. Maps, plans, inventories and administrative records can clarify what the place meant at different dates.
- Historic place names
- Jurisdictional context
- Routes into maps and plans
Contemporary maps, plans, listed-building records, estate papers and the responsible local or national archive.
Three-step research path
- Establish the record: confirm the title “California State Route 243”, its source revision and the description used here.
- Expand the search: follow California State Route 243 primary sources, California State Route 243 archive and California research across catalogues and specialist indexes.
- Test the account: compare the strongest cited source with the responsible institution’s current record and note any disagreement.
Questions for further research
- Which source most directly establishes the central claim about “California State Route 243”?
- Which earlier names or jurisdictions may reveal additional records?
- What physical evidence or contemporary plan supports the description?
Search terms from this dossier
This entry incorporates text from “California State Route 243” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.