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Clark County monitoring shows hot summer temperatures and bacteria at urban sites; several areas improving
Summary
Clark County—s long-term monitoring program shows mixed stream-health trends: urban subwatersheds have higher bacteria and turbidity and several summer temperature readings exceed salmonid standards, while some subwatersheds show improvement since 2010. County staff described program methods, maps and local stormwater projects.
Marley Mosswich Butler, Clean Water special projects coordinator, reviewed Clark County—s monitoring network and methods: nine long-term index sites (monitored monthly), 42 rotating-panel sites on a five-year cycle, continuous temperature loggers and precipitation gauges. She said the county uses the Oregon Water Quality Index (OWQI), a benthic index (BIBI) and a TQ mean (flashiness metric) to…
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