Wawona Tunnel, Wawona Road through Turtleback Dome, Yosemite Village, Mariposa County, CA
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part of Yosemite National Park Roads and Bridges Recording Project, 1991; see HAER No. CA-117 for overview
Significance: The longest vehicular tunnel in the western United States at the time of construction, the Wawona Tunnel is significant for minimizing the negative effects of road construction on the Yosemite landscape.
Unprocessed Field note material exists for this structure: N93
Survey number: HAER CA-105
Building/structure dates: 1931- 1932 Initial Construction