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Salyer vicinity

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



B&W Photos

HB125551
View To Northeast

HB125552
View To East

HB125553
View To Southwest

HB125554
View To West-southwest

HB125555
View To East

HB125556
View To Southeast

HB125557
View To Southeast

HB125558
View To South-southeast

HB125559
View To Northeast

HB125560
View To Southeast

HB125561
View To Southeast

HB125562
View To Southwest

HB125563
View To Northeast

HB125564
View To Southwest

HB125565
View To Northeast

HB125566
View To South-southwest

HB125567
View To West

HB125568
View To Southwest

HB125569
View To Northwest

HB125570
View To Southeast

HB125571
Stress Sheet And General Notes, May 22, 1929.

HB125572
Approach Spans, May 22, 1929.

HB125573
Truss Diagram, May 22, 1929.

HB125574
Erection Details, May 22, 1929.

HB125575
Main Piers And Bearings, May 22, 1929.

HB125576
Truss Details L6-l8, May 22, 1929.

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Data Pages


Photo Caption Pages


Item Title


Location
State Highway 299 spanning South Fork Trinity Rive, Salyer vicinity, CA

Find maps of Salyer, CA


Created/Published
Documentation compiled after 1968.

Notes
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
Civil Engineering
Steel Truss Bridges


Related Names
Mercer-Fraser Company


Collection
Historic American Engineering Record (Library of Congress)

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.


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