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Mapping cold-water refuges on the East Fork Lewis River guides restoration and a $24M floodplain reconnection
Summary
A thermal assessment using airborne FLIR and ground surveys identified cold-water refuges in the East Fork Lewis River and produced a prioritized list of ~30 project concepts; a large Ridgefield Pits floodplain reconnection (~$24 million) is under construction and expected to improve hyporheic connectivity and reduce warm-water gravel-pit traps.
Keith (Lower Columbia Estuary Partnership) described a three-year thermal assessment for the East Fork Lewis River that combined helicopter-mounted thermal infrared (FLIR) mapping, ground validation and stakeholder prioritization to find small-scale cold-water refuges that juvenile salmon depend on during hot summers. The study ranked about 30 candidate…
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