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The available Caltrans chronology does not support a blanket statement that all of Highway 36 was built before the Redwood Highway. It describes a route assembled from segments and identifies different kinds of dates.
What the Caltrans table establishes#
Appendix L of A Historical Context and Methodology for Evaluating Trails, Roads, and Highways in California lists SR 36 with a 1964 “formed” date and a 1907–1933 range under “Became a State Highway.” The table’s endpoints are Fortuna/US 101 and Susanville/US 395. These fields concern route history and state-system incorporation; neither field states that the complete road was constructed in 1907.
The distinction matters when comparing roads. A route number can be assigned to existing roads. A section can enter state administration before later construction or improvement. Different sections of one modern highway can therefore have different histories.
Comparison with the Redwood Highway#
The Redwood Highway history hub distinguishes its bond authorization, construction, and later alignments. “Which road was first?” becomes answerable only after identifying the particular segment and whether the comparison concerns a trail, wagon road, state adoption, through automobile travel, or a numbered highway.
For a defensible segment history, follow the route table into dated legislation, highway commission reports, construction contracts, and contemporary maps. A modern route shield is not proof that the same number appeared on a nineteenth-century map. A photograph of an old road is likewise insufficient to establish its administrative status.
Research boundary#
This note deliberately does not assign a single opening date to the complete Fortuna–Susanville corridor. The reviewed table supplies a useful starting chronology, not that conclusion. The transportation research guide and historical maps library provide the next research paths.