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Road crossings at rivers and streams can create barriers to the movement of migratory fish when they are improperly designed or constructed. Washington State is home to several threatened species of salmon and trout, including bull trout, and recovery plans for these fish include repairing or replacing culverts that currently block their passage. The state is currently looking to replace approximately 1,000 culverts at an estimated cost of $2.45 billion. As engineers re-design these culverts, which typically have a service life of 50-100 years, it will be important to consider how changing climate conditions will impact streams in the region. Climate change is projected to increase peak streamflows, and therefore...
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Climate change scientists have noted changes in Pacific Northwest hydrology, including reductions in the size of glaciers, less snowpack, and earlier peak stream flow in many rivers. These trends are expected to continue, along with increasing flood size, and decreasing summer low flows. Typically, the size of water-crossing structures like culverts and bridges is based on stream width. As the size of floods increases, so will stream width. WDFW’s web application can help you understand how the stream width at your project site may change in the future -- the 2040s and 2080s. With this information, you can make an informed decision about the design of your new culvert, bridge, or habitat restoration project. Culverts...
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The Western Governors’ Association has sponsored an assessment of crucial habitats which will be used for the evaluation of landscape-scale energy, land use, and transportation projects. At present, this assessment does not incorporate ecological integrity or stream-network connectivity into its assessment of aquatic habitats. This proposal will address in both Oregon and Washington states the need to incorporate ecological integrity and stream network connectivity into the Western Governors’ assessment of aquatic crucial habitats.
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