South Fork Trinity River Bridge, State Highway 299 spanning South Fork Trinity River, Salyer, Trinity County, CA

Significance: The South Fork Trinity River Bridge is one of a very limited number of cantilever truss highway bridges in California. Best suited to specific terrain conditions such as deep canyons to be crossed by a single span, or where use of falsework was impractical, the type enjoyed brief popularity in California during the decade spanning the late 1920s to the late 1930s. With a high degree of integrity, and representing a type, period, and method of construction, the South Fork Trinity River Bridge was determined eligible for inclusion in the National Register of Historic Places on December 9, 1983, meeting Criterion C at the local level of significance.

Survey number: HAER CA-29

Building/structure dates: 1930 Initial Construction

steel truss bridges civil engineering vehicular bridges cantilever trusses deck trusses transportation salyer fork trinity bridge south fork trinity river bridge highway state highway south fork trinity river trinity county california american bridge company historic american engineering record ja mohr and sons korbel lumber company mercer fraser company santa cruz portland cement company photo ultra high resolution high resolution library of congress national register of historic places

1969 - 1980

Library of Congress

http://www.loc.gov/

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