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The Middle Fork Willamette River basin encompasses 3,548 square kilometers of western Oregon and drains to the mainstem Willamette River. Fall Creek basin encompasses 653 square kilometers and drains to the Middle Fork Willamette River. In cooperation with the U.S. Army Corps of Engineers, the U.S. Geological Survey evaluated geomorphic responses of downstream river corridors to annual drawdowns to streambed at Fall Creek Lake. This study of geomorphic change is focused on the major alluvial channel segments downstream of the U.S. Army Corps of Engineers’ dams on Fall Creek and the Middle Fork Willamette River, as well as the 736 hectare Fall Creek Lake. Reservoir erosion during streambed drawdown results in sediment...


map background search result map search result map Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P1 from 1975 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T3 from 1976 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P1 from 1977 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T9 from 1980 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T5 from 1987 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T6 from 1987 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T7 from 1987 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P8 from 1988 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P7 from 1989 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T2 from 1991 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T4 from 1991 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P6 from 2001 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P8 from 2002 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T9 from 2004 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T4 from 2006 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T6 from 2006 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands P1, T1, and T3 from 2009 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands P6 and P7 from 2012 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P7 from 2014 High-resolution digital elevation model of Fall Creek Lake, Oregon, acquired during annual drawdown to streambed November 8, 2016 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T4 from 1991 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T6 from 1987 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T5 from 1987 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T7 from 1987 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T3 from 1976 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T2 from 1991 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P7 from 1989 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T9 from 1980 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T4 from 2006 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T6 from 2006 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P8 from 1988 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T9 from 2004 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P1 from 1977 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P6 from 2001 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P1 from 1975 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P7 from 2014 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands P1, T1, and T3 from 2009 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P8 from 2002 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands P6 and P7 from 2012 High-resolution digital elevation model of Fall Creek Lake, Oregon, acquired during annual drawdown to streambed November 8, 2016