Impervious Surfaces

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Source NOAA Coastal Change Analysis Program (C-CAP); National Land Cover Database; Thurston Regional Planning Council
Data Table 9-02: Impervious Surfaces by Watershed
Map Thurston County Watersheds
Explanation Watersheds or basins that have an impervious land cover of more than 10% are generally assumed to have degraded water quality. Two watersheds in Thurston County were near or above this level in 2014: Henderson Inlet, with approximately 17.3% impervious surface coverage, and Budd/Deschutes with 9.4%.
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