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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 P4 from 1977 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T2 from 1983 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T6 from 1986 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P1 from 18 July 1990 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T6 from 1991 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T1 from 26 July 1996 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T4 from 14 July 1999 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P3 from 2000 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T9 from 2000 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P11 from 2001 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P7 from 2002 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T8 from 2002 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T5 from 2003 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P1 from 2005 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P11 from 2007 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands P6 and P7 from 2011 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands T4, T5, T6, and T7 from 2012 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands T8 and T9 from 2012 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands P8 and T1 from 2015 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 T6 from 1991 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T6 from 1986 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T2 from 1983 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T4 from 14 July 1999 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T1 from 26 July 1996 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T8 from 2002 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P4 from 1977 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T9 from 2000 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P3 from 2000 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland T5 from 2003 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P1 from 18 July 1990 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands T4, T5, T6, and T7 from 2012 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands P8 and T1 from 2015 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P1 from 2005 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P7 from 2002 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands P6 and P7 from 2011 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P11 from 2001 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetlands T8 and T9 from 2012 Digital Orthorectified Aerial Image of Cottonwood Lake Study Area Wetland P11 from 2007 High-resolution digital elevation model of Fall Creek Lake, Oregon, acquired during annual drawdown to streambed November 8, 2016