New open-bottom arch culvert on Stillwell Creek. Many culverts block fish migration upstream. The inherent strength, durability, cost-savings, and rapid installation of precast concrete bridges have made them the premier bridge technology in the world. The largest structure was the Whitehorse Crossing which required an H-Pile foundation consisting of Lineal Meters of driven piles. Boulder steps were built inside the culvert every 20 feet. In the last few years, many miles of habitat have been opened up for coho salmon, steelhead, and cutthroat trout as a result of restoration projects to replace small and failing culverts with new ones that more closely match the stream's gradient, width and bed or with bridges that span the stream. For information on the exact coefficients used and to view diagrams showing the different culvert wingwall configurations, see the help describing the HY-8 polynomial coefficients.
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Precast Bridges and Structures
The old culvert had been built perpendicular to the road. Randomly placed boulders were added to the streambed through the culvert, and logs were placed below the culvert to capture sediment as it moved through the new culvert. Prefabricated bridge components ensure a long life cycle and low life cycle costs, requiring virtually no maintenance. The new culvert is a foot wide open-bottom concrete box culvert , and is skewed to better fit the alignment of the stream channel. A 4-foot diameter round pipe, which was often partially blocked with woody debris and sediment, was replaced with an foot wide open-bottom arch.
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Boulder steps were built inside the culvert every 20 feet. Headwalls retain earth fill over the top of the arch structure at each end. We are taking a new approach to culvert design that fits the culvert to the stream and not the stream to the culvert. The old culvert had been built perpendicular to the road. For information on the exact coefficients used and to view diagrams showing the different culvert wingwall configurations, see the help describing the HY-8 polynomial coefficients. Elliptical culvert under resource haul road with well armored inlet to minimize erosion possibilities. Building a streambed inside the culvert that simulates the natural streambed above and below the culvert.
Description:Using precast concrete headwalls, wingwalls and foundations, an entire structure can often be installed in one day. Prefabricated, modular concrete bridges require less material than cast-in-place structures, for a lower initial cost. Use of non-proprietary shapes simplifies the bidding process and complies with public funding requirements. Personal tools Create account Log in. It offers the load-carrying capacity of the arch while the vertical legs maximize open area for waterway or other clearance requirements. A foot wide pipe arch was replaced with a foot wide open-bottom metal arch. Because of this, separate polynomial coefficients were determined for culverts with each of these span-to-rise ratios.