Geomorphic Mapping of Fall Creek Lake, Oregon, 2016
Dates
Publication Date
2021-01-25
Time Period
2016-11-10
Citation
Keith, M.K., and Stratton Garvin, L.E., 2021, Geomorphic Mapping of Fall Creek Lake, Oregon, 2016: U.S. Geological Survey data release, https://doi.org/10.5066/P9YZSJJJ.
Summary
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 to dam operations at Fall Creek Lake in which lake levels are temporarily lowered to streambed each fall or winter to facilitate downstream passage of juvenile spring Chinook salmon. Reservoir erosion during these streambed drawdown operations results in sediment delivery to downstream reaches. This study of geomorphic change is focused on the major alluvial channel segments downstream of [...]
Summary
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 to dam operations at Fall Creek Lake in which lake levels are temporarily lowered to streambed each fall or winter to facilitate downstream passage of juvenile spring Chinook salmon. Reservoir erosion during these streambed drawdown operations results in sediment delivery to downstream reaches. 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 7.36 square kilometers Fall Creek Lake. This mapping, along with analyses of topographic change, were carried out to better understand patterns and processes of erosion within the reservoir that occur during streambed drawdowns and how they may relate to geomorphic changes in downstream reaches.
This dataset consists of a single GIS layer defining the reservoir spatial domains, landforms, and substrates within the Fall Creek Lake reservoir. For this study, the reservoir mapping area boundary was defined by elevation, encompassing all landforms within maximum pool elevation of 254 meters (North American Vertical Datum of 1988) and extends about 10 kilometers from Fall Creek Dam upstream to Big Fall Creek Road bridge. The dataset was mainly developed by digitizing from orthophotographs and digital elevation models (DEMs) created from aerial photographs collected in November 2016 and supplemented with lidar data collected in January 2012.
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Related External Resources
Type: Related Primary Publication
Keith, M.K., Wallick, J.R., Schenk, L.N., Stratton Garvin, L.E., Gordon, G.W., and Bragg, H.M., 2024, Reservoir evolution, downstream sediment transport, downstream channel change, and synthesis of geomorphic responses of Fall Creek and Middle Fork Willamette River to water years 2012–18 streambed drawdowns at Fall Creek Lake, Oregon: Scientific Investigations Report, https://doi.org/10.3133/sir20235135.
Digital channel maps were produced to depict reservoir landforms and substrate conditions in Fall Creek Lake from orthophotograph and DEMs. These data have been created to support an assessment of geomorphic responses to sediment released from Fall Creek Lake between 2011 and 2018 on Fall Creek and the Middle Fork Willamette River, in western Oregon. The detailed geomorphic mapping provides a basis for evaluating geomorphic context and temporal and spatial patterns of sediment deposition and erosion in Fall Creek Lake.
