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This is a huge question that has lead to many dissertations, extraordinary amounts of research, and volumes of literature. It often boils down to one simple answer, human disturbance. Human disturbance includes all of the activities in which we engage that alter natural processes. A little human disturbance will not usually create an unhealthy stream, but when the disturbance alters water quality, hydrology, ecosystems, etc., stream health declines.

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Q: What causes unhealthy rivers and streams?
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