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Photographic reproductions of original (1912) photographs of the Parks Bar Bridge on State Highway 20 crossing the Yuba River near Smartsville, Yuba County. Example of the Thomas System of pre-cast, reinforced concrete, three-hinged arch bridges. Design and method of bridge construction was patented by William M. Thomas during his association with W. S. Post in their Los Angeles engineering firm of Thomas and Post. View 32 (1994-0033). Preliminary work, with old suspension bridge in middle ground, looking downstream, view to west. CA-132-32 -- view 33 (1994-0034). Steam-powered pile driver working on footings for Pier 3, with south abutment visible at right; view to south. CA-132-33 -- view 34 (1994-0035). Steam-powered stiff-leg power shovel at work, Pier 2 or 3 at left; view to north. CA-132-34 -- view 35 (1994-0036). Caisson on Pier 2 at center, with pile driver working on Pier 1; view to north-northeast. CA-132-35 -- view 36 (1994-0037). North arch abutment, view to northeast. CA-132-36 -- view 37 (1994-0038). Pier 1, view to northwest. CA-132-37 -- view 38 (1994-0039). Falsework in place, formwork beginning to be placed, for arch rib between north abutment and Pier 1, view to south-southwest. CA-132-38 -- view 39 (1994-0040). Second piece of formwork being readied for lifting into place for arch rib at north abutment, view to northwest. CA-132-39 -- view 40 (1994-0041). Second piece of formwork being lifted into place for arch rib at north abutment, view to northwest. CA-132-40 -- View 41 (1994-0042). Second piece of formwork being lifted into place for arch rib at north abutment, view to northwest. CA-132-41 -- view 42 (1994-0043). Piers 2 and 3 under construction. Pier 3 at right, pier 2 still in forms at left center, pier 1 with formwok for arch ribs in place at left; view to north-northeast. CA-132-42 -- view 43 (1994-0044). Arch ribs between north abutment and pier 1 completed, working platform for constructing spandrel members being placed; formwork for arch ribs between pers 1 and 2 being placed; concrete placement tower at center with chute ready for a pour; view to northwest. Ca-132-43 --view 44 (1994-0045). Arch ribs in place, arch ribs between piers 2 and south abutment still in forms, south abutment at right, pier 3 at center, pier 2 at left; falsework for deck and south approach spans being placed, view to east. CA-132-44 -- view 45 (1994-0046). Formwork for decks in place, except on arch ribs between piers 2 and 3, concrete being poured on south arch, view to north-northeast from near south abutment. CA-132-45 --view 46 (1994-0047). Lowering concrete placement tower, Pier 1 at center; view to northwest. CA-132-46 -- view 47 (1994-0048). Pouring deck columns, steam-powered concrete mixer at center; direction of view not clear, but probably to north. CA-132-47. Accompanied by: Parks Bar Bridge (Yuba River Bridge), California State Highway 20 spanning the Yuba River, Smarville vicinity, Yuba County, California : photographs, written historical and descriptive data. San Francisco, Calif. : Historic American Engineering Record, National Park Service, Western Region, Dept. of the Interior, 1993. Report prepared by Bonnie Wehle Parks. , 14 p. ; 28 cm. HAER No. CA-132.
Photographs. Nonprojected graphic
16 photographic prints ; 8 x 10 in.
Rivers--California, Northern Bridges--California--Yuba River Bridge construction--California--Yuba River Yuba River (Calif.)--Photographs Parks Bar Bridge (Yuba County, Calif.)--Photographs Photographic prints Aerial views
California, Northern California Yuba River Yuba River (Calif.) Parks Bar Bridge (Yuba County, Calif.)