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

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Historic American Buildings Survey/Historic American Engineering Record/Historic American Landscapes Survey

61 b&w photos
6 data pages
5 photo caption pages

TITLE:
South Fork Trinity River Bridge, State Highway 299 spanning South Fork Trinity Rive, Salyer vicinity, Trinity County, CA

CALL NUMBER:
HAER CAL,53-SALY.V,1-

REPRODUCTION NUMBER:
[See Call Number]

MEDIUM:
Photo(s): 61 (4 x 5 in. and 8 x 10 in.)
Data Page(s): 5 plus cover page
Photo Caption Page(s): 5

DATE:
Documentation compiled after 1968.

CREATOR:
Historic American Engineering Record, creator

RELATED NAME(S):
Mercer-Fraser Company

NOTE:
Survey number HAER CA-29

Building/structure dates: 1930 initial construction

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.

SUBJECTS:
CALIFORNIA--Trinity County--Salyer vicinity
civil engineering
steel truss bridges

COLLECTION:
Historic American Engineering Record (Library of Congress)

REPOSITORY:
Library of Congress, Prints and Photograph Division, Washington, D.C. 20540 USA

DIGID:
http://hdl.loc.gov/loc.pnp/hhh.ca1365

CONTENTS:
Photograph caption(s):
1. View to northeast. Oblique view of upstream side of bridge. (90mm lens)
2. View to east. Oblique view of downstream side of bridge and east pier. (135mm lens)
3. View to southwest. Oblique view of downstream side of bridge and west pier. (135mm lens)
4. View to west-southwest. Oblique view of upstream side of bridge from approximately deck level. (90mm lens)
5. View to east. Oblique view of downstream side of bridge. (90mm lens)
6. View to southeast. View of downstream side of bridge from riverbed. (90mm lens)
7. View to southeast. View of downstream side of bridge from confluence of Trinity and South Fork Trinity Rivers. (90mm Lens)
8. View to south-southeast. View of downstream side of bridge. (90mm lens)
9. View to northeast. Oblique view of upstream side of bridge from approximately deck level. (90mm lens)
10. View to southeast. Overview of bridge in setting; downstream side. (135mm lens)
11. View to southeast. More distant overview of bridge in setting; downstream side. (135mm lens)
12. View to southwest. View along centerline from Trinity County side of bridge. (90mm lens)
13. View to northeast. View along centerline from Humboldt County side of bridge. (90mm lens)
14. View to southwest. View through truss along centerline from below deck. (65mm lens)
15. View to northeast. View along centerline from below deck; detail of bent and floor beams. (65mm lens)
16. View to south-southwest. Detail, connection point U1 (see plans), from below deck. (135mm lens)
17. View to west. Detail, connection point L2 (see plans), from below deck. (135mm lens)
18. View to southwest. Detail, bearing shoe, upstream side of east pier. Copy negative made from 35mm color transparency made with with 135mm lens by John Snyder, due to lack of sufficiently long lens for 4x5 camera.
19. View to northwest. Aerial view of bridge in setting; upstream side. (135mm lens)
20. View to southeast. Aerial view of bridge in setting; downstream side. (135mm lens)
21. Stress Sheet and General Notes, May 22, 1929.
22. Approach Spans, May 22, 1929.
23. Truss Diagram, May 22, 1929.
24. Erection Details, May 22, 1929.
25. Main Piers and Bearings, May 22, 1929.
26. Truss Details L6-L8, May 22, 1929.

CONTROL #:
CA1365

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