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"This synthesis report will be of interest to state highway design engineers and structural engineers, as well as environmental and historic preservation personnel in transportation agencies. It will also be of interest to state historic preservation offices, federal historic preservation agencies, ang engineering preservation consultants"--Avant-propos.
Designed first and foremost to be practical, bridges nevertheless are often breathtaking in their construction, combining function and aesthetics. The historic structures that span the Evergreen State's highways are no exception. These technological wonders are extraordinary by any measure, yet their stories have remained largely unknown. Conceived by visionary engineers and built by anonymous workmen, Washington's highway bridges are amazing triumphs of skill, and played a significant role in the state's history. Several, at the time of their completion, attracted worldwide attention and the praise of professional engineers, influencing the course of bridge construction. In their quest to compile the first comprehensive history of the state's highway bridges, the authors poured through the extensive records at the Washington State Department of Transportation (WSDOT), collecting definitive documentation and photographs from across the state. This magnificent book, including more than 100 illustrations, represents the culmination of years of study by many individuals associated with WSDOT and the Office of Archaeology and Historic Preservation (Olympia).
Rugged individuals armed with hand tools, sweat, and ambition began building covered bridges in Oregon during the mid-1850s. These bridge builders often camped out at remote sites, living off the land or contracting with local farmers for food. Early owners of covered bridges financed construction by charging tolls3 for a sheep, 5 for a horse and rider, and 10 for a team of horses and wagon. In the early 20th century, the state provided standard bridge and truss designs to each county, and most of the resulting structures incorporated the Howe truss. With the abundance of Douglas fir and the shortage of steel during the world wars, the construction of wooden covered bridges continued well into the 1950s, mainly in the Willamette Valley. During the 1920s, Oregon boasted more than 350 covered bridges.
In the 1920s and 1930s, Oregon's legendary bridge engineer Conde B. McCullough designed a first-rate collection of aesthetic bridges on the Oregon Coast Highway to enhance an already dramatic and beautiful landscape. The six largest of these, at Gold Beach, Newport, Waldport, Florence, Reedsport, and Coos Bay, eliminated the last ferries on the Oregon Coast Highway between the Columbia River and California. McCullough planned to build one bridge each year after completion of the Rogue River Bridge at Gold Beach in 1932, but the tightening grip of the Depression threatened his plans. In 1933, McCullough and his staff worked day and night to finish plans for the remaining five bridges, and in early 1934, the Public Works Administration funded simultaneous construction of them. The combined projects provided approximately 630 jobs, but at least six workers perished during construction. After the bridges were complete, Oregon coast tourism increased by a dramatic 72 percent in the first year.
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 28. Chapters: Belknap Bridge, Big Creek Bridge (Oregon), Cape Creek Bridge, Chambers Covered Bridge, Conde McCullough Memorial Bridge, Coyote Creek Bridge, Crawfordsville Bridge, Currin Bridge, Deadwood Creek Bridge, Depoe Bay Bridge, Dorena Bridge, Earnest Bridge, Gallon House Bridge, Goodpasture Bridge, Harris Bridge (Wren, Oregon), Hayden Bridge, Interstate Bridge, Irish Bend Covered Bridge, Isaac Lee Patterson Bridge, Lake Creek Bridge, Lewis and Clark Bridge (Columbia River), List of bridges on the National Register of Historic Places in Oregon, Lost Creek Bridge, Lowell Bridge, Mosby Creek Bridge, Office Bridge, Oregon City Bridge, Parvin Bridge, Pengra Bridge, Rock O' the Range Bridge, Short Bridge, Siuslaw River Bridge, Ten Mile Creek Bridge (Oregon), Umpqua River Bridge, Union Street Railroad Bridge, Vista Bridge, Wendling Bridge, Wildcat Creek Bridge, Wilson River Bridge, Yaquina Bay Bridge. Excerpt: This is a list of bridges and tunnels on the National Register of Historic Places in the U.S. state of Oregon. Gray shading indicates that a structure has been removed from the Register. Often the road listed in the "location" column now parallels the bridge on a new one, and the old bridge is closed to traffic. The Interstate Bridge (also Columbia River Interstate Bridge, I-5 Bridge, Portland-Vancouver Interstate Bridge, Vancouver-Portland Bridge) is a pair of nearly identical steel vertical-lift, through-truss bridges that carry Interstate 5 traffic over the Columbia River between Vancouver, Washington, and Portland, Oregon, in the United States. The bridge opened to traffic in 1917 as a single bridge carrying two-way traffic. A second, twin bridge opened in 1958 with each bridge carrying one-way traffic. The original 1917 structure is the northbound bridge. As of 2006, the bridge pair handles around 130,000 vehicles...