Large woody debris in streams builds pools that shelter fish through low flows
Fallen logs and root wads lodged in a channel force water to scour pools, slow currents, and create cover. Those microhabitats become cold-water refuges when summer flows shrink to a trickle.
“Cleaning” streams of wood for navigation or neatness removes the architecture fish, amphibians, and invertebrates need. Restoration crews now reintroduce engineered logjams where natural recruitment was cut off.
A river without wood is a hallway without furniture. Leaving or rebuilding woody debris turns a flat ditch back into a living mosaic of pools and riffles.
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