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In Terrebonne, Oregon the Crooked River Bridge has constructed
adjacent to the classic Conde McCullock Steel arch bridge. The New
bridge spans the Crooked River Gorge, 300 ft. above the river, with an
concrete arch span of 410 ft. The structure is being built in 28 x 43-ft.
segments that will support a concrete box girder that is 79 ft. wide and 5
ft.- 6 in. deep and spans 53 ft. between spandrel columns.
U.S. High Gorge Cast-in-Place Segmental Arch Bridge ever
Completion Date: Sept 16, 2000
costs: 15.8 Million
Designer: T.Y. Lin
Contractor: Kiewit Pacific Co.
years in the making from design through construction, the Crooked River
Bridge in Terrebone, Oregon, opened to traffic on September 16, 2000.
Spanning a dramatic basalt gorge 300 feet above the Crooked River, this is
the first major cast-in-place segmental concrete arch bridge in the United
States and “one of ODOT’s marquee projects of the decade,” according
to Mark Hirota, PE, State Bridge Engineer for the Oregon Department of
Transportation. The bridge,
which is located about 10 miles north of Redmond on Highway 97, is 535
feet long and 79 feet wide.
Designed by T.Y. Lin International, Crooked
River Bridge has set a new standard in bridge engineering and construction
and created new possibilities for concrete arches over deep crossings.
Although cable-stayed construction and the use of segmental travelers are
both relatively common, they had never before been combined on an arch
bridge design in the United States.
The unusual engineering solution responded to
the complexity of the site, whose vertical sides precluded traditional
construction, 185-foot tall stay towers were erected on both rims of the
gorge, which is 410 feet wide. Steel
cables suspended the segmental travelers as each segment was cast, moving
from the canyon rims toward the center.
When the arch was complete, finally meeting at the center within
one inch of allowed tolerances, the towers and cables were removed.
“Given the uniqueness of the site,
constructibility became more than just a cost factor because the
construction scheme would define the feasibility of a concrete
crossing,” said David Goodyear, the project chief bridge engineer for
T.Y. Lin International. More
than 7,860 cubic yards of concrete – the equivalent of 1,000 concrete
mixer loads – were used to construct the new bridge.
It is reinforced with one-inch rebar that, if placed end to end,
would stretch 132 miles.
Crooked River Bridge replaces the High Bridge
– now a certified historic landmark – which was designed by famed
Oregon bridge engineer Conde B. McCullough and built in 1926. The state
will retain High Bridge as a pedestrian and bicycle crossing after
structural improvements have been made.
Mandated as an arch by ODOT and a citizen advisory committee, the
new bridge compliments the design of the old, with adequate separation
between the two to allow scenic views of both. “Oregon has developed a
culture of bridge design that has largely avoided the stark and industrial
efficiency that has affected bridge designs in other states,” commented
Goodyear. He added, “The bridge is painted to blend with Nature’s high
desert palette. The box is a
burnt brown, the arch and columns a rust-red, and abutments a rock-colored