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Corkscrew Bridge, Old East Entrance Road, Sylvan Pass, Yellowstone National Park, Park County, WY
Photo Caption Pages
Sylvan Pass, Yellowstone National Park, WY
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Documentation compiled after 1968.
Survey number HAER WY-86
Unprocessed field note material exists for this structure (N949).
Building/structure dates: 1904 initial construction
Building/structure dates: 1916 subsequent work
Building/structure dates: 1919 subsequent work
Significance: The Corkscrew Bridge employed an unusual engineering technique to change elevation rapidly on a steep section of the East Entrance Road near Sylvan Pass. By 1929, when it was bypassed with a road constructed along the above slope, the increasing power and speed of automobiles had rendered it obsolete.
Concrete Arch Bridges
Perham & Harris
Chittenden, Capt. Hiram M.
Crecelius, S. F.
McClure, Nancy M., Historian
Huisman, Forrest, Delineator
Lowe, Jet, Photographer
Historic American Engineering Record (Library of Congress)
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