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The watershed lies partly in the Coast Range ecoregion and partly in the Willamette Valley ecoregion designated by the U.S. Environmental Protection Agency (EPA).[33] The historic lower Balch Creek watershed through the 1880s was a mixture of open water, wetlands, grassland, and forest, while above the flood plain the watershed consisted of closed canopy forest.[34] People who settled here in the 19th century logged much of this forest and filled the wetlands.[34] In 2002, aerial photographs showed that buildings, parking lots, shoreline structures, and other cleared areas covered most of the lower floodplain.[34] On the other hand, hill forests protected from major disturbance covered about 65 percent of the watershed.[34]



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The historic
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