In the early 1920s, the State of California had the daunting task of plotting out a highway system, and there were plenty of details to be dealt with. Among them, especially for the traveling public, was the designation of highway routes. In the early 1920s, the California Automobile Association led a campaign to give descriptive names of the mountain routes. Highway boosters of the region proclaimed the route between Red Bluff and Susanville, the Lassen Volcanic Highway, since the highway went by the southern entrance of the national park. In time, the State of California began to use a numbering system, and initially proclaimed this route as Number 29. In 1935, it was changed to State Highway Route 36. The change of the number was necessary to reflect the adoption of a uniform system, where even road numbers went to east-west direction and odd ones were for north-south routes.