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Watershed health monitoring cycles

Since 2009, we've sampled selected streams and rivers to monitor conditions and track trends in watersheds across the state that are not on federal or tribal lands. Find where we have already monitored, and see our data. Learn about past watershed monitoring cycles that give us a snapshot of regional trends.

Random sites help estimate regional conditions and trends

The network of streams we monitor are naturally formed, freshwater, and flow year-round. Between 2009-2017, we sampled 520 random sites. Half of the sites in a sample season are drawn from those that were already sampled in the previous survey. Comparing results over time should objectively show if regional conditions decline or improve.

Reference sites give context to random sites

We've handpicked 90 locations to represent least-disturbed conditions from each of three larger-scale reference regions around the state. Sixteen of these sites, called the sentinel sites, are sampled every year and provide a way to estimate statewide large-scale environmental changes across years.

See where we have sampled

Explore the maps below to see the sites we've sampled from 2009-2017.