1-02B: Impervious Area
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PERCENT IMPERVIOUS SURFACE COVER
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THURSTON COUNY WATERSHEDS
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1991, 1996, 2001, 2006, 2011, 2014
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NOAA C-CAPNLCDTRPC ESTIMATES
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WatershedLand Acres199119962001200620112014BUILDOUT
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Black River79,5001.5%1.6%2.5%2.6%2.7%2.7%4.9%
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Budd Inlet/Deschutes River101,5705.9%6.3%8.2%8.9%9.2%9.4%12.5%
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Chehalis River46,7702.2%2.3%3.2%3.3%3.4%3.5%6.5%
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Eld Inlet23,6702.2%2.4%3.9%4.2%4.4%4.5%6.3%
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Henderson Inlet28,65010.3%11.1%14.4%16.1%17.1%17.3%22.5%
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Nisqually River88,7602.0%2.2%3.7%4.3%4.5%4.6%8.0%
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Skookumchuck River54,9600.4%0.4%0.8%0.8%0.8%0.8%2.7%
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Totten Inlet19,8501.1%1.2%1.8%1.9%1.9%1.9%3.5%
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West Capitol Forest19,4400.1%0.1%0.2%0.2%0.2%0.2%0.4%
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Total Thurston County463,1703.0%3.2%4.5%4.9%5.2%5.2%8.0%
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SOURCE
2014 - Buildout:
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Thurston Regional Planning Council (TRPC)
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Estimates of Current and Future Impervious Area for Watershed-Based Land Use Planning (2015 update)
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http://www.trpc.org/regionalplanning/environment/Pages/HealthyWatersheds.aspx
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2006 - 2011:
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National Land Cover Database (NLCD) 
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http://www.mrlc.gov/
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1991 - 2001:
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NOAA Coastal Change Analysis Program (C-CAP)
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http://www.csc.noaa.gov/digitalcoast/data/ccapregional
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NOTE
Data for Thurston County portions of watersheds only.
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Land acres exclude major water bodies.
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"Buildout" is an estimate of the maximum impervious surface coverage if all residential lands were developed under current zoning and development regulations.
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DATE UPDATED11/17/2015
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