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Evaluating all the data they have collected the
Irving biologists identify which streams need work to make them better
habitat for fish and other wildlife. Sometimes this means the forest
workers must clear the stream bed of debris, or stabilize the stream
banks to keep the earth and rock from sliding into the waterway. Other
work involves placing small barriers called riffles across part of the
waterway to slow the water’s speed. Fast moving water can be so
strong a force that the fish are unable to swim against it as they go
upstream to spawn. Fast-moving water will also undercut a stream’s
banks and allow more earth to slide into the stream bed, so fish cannot
make their way through the shallow water.
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