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The RCS extent was derived by a combination of Hydrologic units both Watershed Boundaries and Subwatershed Boundaries. The intent was to reach from the foothills of the Cascades over to the foothills of the Coast Range and from the East Fork of the Lewis River to south of the metro UGB.
Data sources used to develop the extent were based off the USGS Watershed Boundary Dataset (WBD) http://www.ncgc.nrcs.usda.gov/products/datasets/watershed/index.html
For more information, please refer to the Technical Report available from The Intertwine Alliance website (http://theintertwine.org/), Clean Water Services, and Metro.