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Fall Creek and Middle Fork Willamette Geomorphic Mapping Geodatabase


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Keith, M.K., and Gordon, G.W., 2019, Fall Creek and Middle Fork Willamette Geomorphic Mapping Geodatabase: U.S. Geological Survey data release,


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 including the lowermost 11.5 km of Fall Creek and 27.3 km of the Middle Fork Willamette River, as well as Fall Creek Lake. GIS layers defining the landforms, cover type, vegetation [...]


Originator :
Mackenzie Keith, Gabriel W Gordon
Metadata Contact :
Mackenzie Keith
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
SDC Data Owner :
Oregon Water Science Center
USGS Mission Area :
Water Resources

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Digital channel maps were produced to depict channel and floodplain conditions along Fall Creek and the Middle Fork Willamette River from aerial photographs. These data have been created to support an assessment of geomorphic responses to sediment released from Fall Creek Lake between 2011 and 2017 on Fall Creek and the Middle Fork Willamette River, in western Oregon. This geomorphic mapping provides an inventory of existing landforms and habitats from which to evaluate spatial and temporal changes that may result from multiple factors, including aggradation of reaches downstream of Fall Creek Lake that may result from annual lowering of lake levels to streambed that occurs during the drawdown period. The detailed mapping will also provide a basis for evaluating geomorphic context and temporal and spatial patterns of sediment deposition. This mapping will also be used to track temporal changes in channel morphology and planform over the course of the drawdowns. Additional historical mapping provides context for comparing channel change 2011–2017 with channel morphology and patterns of channel change that occurred prior to dam construction.

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DOI doi:10.5066/P9THIZD6

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