Mackenzie Keith
Mackenzie Keith is a Hydrologist at the USGS Oregon Water Science Center.
Mackenzie joined the Oregon Water Science Center in 2009 as a hydrologist on the Geomorphology Team. Her main research focuses on documenting and understanding recent and historical physical changes to rivers to inform restoration and management decisions. Current projects include characterizing the geomorphic responses of dam removal on the Sandy River, mapping the Willamette River floodplain geomorphology, characterizing the coupled upstream-downstream geomorphic responses to deep reservoir drawdowns at Fall Creek Lake, and developing a geomorphic framework to inform erosion and deposition processes within Willamette Valley reservoirs.
Education and Certifications
B.S. in Geology, Oregon State University, 2006
M.S. in Geology, Portland State University, 2012
Science and Products
Below are publications that Mackenzie Keith has authored.
Preliminary assessment of aggradation potential in the North Fork Stillaguamish River downstream of the State Route 530 landslide near Oso, Washington
Geologic and geomorphic controls on the occurrence of fens in the Oregon Cascades and implications for vulnerability and conservation
Geomorphology and flood-plain vegetation of the Sprague and lower Sycan Rivers, Klamath Basin, Oregon
Organic matters: investigating the sources, transport, and fate of organic matter in Fanno Creek, Oregon
Investigating organic matter in Fanno Creek, Oregon, Part 1 of 3: estimating annual foliar biomass for a deciduous-dominant urban riparian corridor
Investigating organic matter in Fanno Creek, Oregon, Part 3 of 3: identifying and quantifying sources of organic matter to an urban stream
Investigating organic matter in Fanno Creek, Oregon, Part 2 of 3: sources, sinks, and transport of organic matter with fine sediment
Assessing inundation hazards to nuclear powerplant sites using geologically extended histories of riverine floods, tsunamis, and storm surges
Geologic and physiographic controls on bed-material yield, transport, and channel morphology for alluvial and bedrock rivers, western Oregon
Geomorphic and vegetation processes of the Willamette River floodplain, Oregon: current understanding and unanswered science questions
Preliminary assessment of channel stability and bed-material transport in the Tillamook Bay tributaries and Nehalem River basin, northwestern Oregon
Geomorphic response of the Sandy River, Oregon, to removal of Marmot Dam
Non-USGS Publications**
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
Below are data sets that Mackenzie Keith has authored.
Science and Products
- Publications
Below are publications that Mackenzie Keith has authored.
Filter Total Items: 29Preliminary assessment of aggradation potential in the North Fork Stillaguamish River downstream of the State Route 530 landslide near Oso, Washington
On March 22, 2014, the State Route 530 Landslide near Oso, Washington, traveled almost 2 kilometers (km), destroyed more than 40 structures, and impounded the North Fork Stillaguamish River to a depth of 8 meters (m) and volume of 3.3×106 cubic meters (m3). The landslide killed 43 people. After overtopping and establishing a new channel through the landslide, the river incised into the landslide dAuthorsChristopher S. Magirl, Mackenzie K. Keith, Scott W. Anderson, Jim O'Connor, Robert Aldrich, Mark C. MastinGeologic and geomorphic controls on the occurrence of fens in the Oregon Cascades and implications for vulnerability and conservation
Montane fens are biologically diverse peat-forming wetlands that develop at points of groundwater discharge. To protect these ecosystems, it is critical to understand their locations on the landscape and the hydrogeologic systems that support them. The upper Deschutes Basin has a groundwater flow system that supports baseflow in many rivers, but little is known about the wetland types and groundwaAuthorsA. Aldous, Marshall W. Gannett, Mackenzie K. Keith, James E. O'ConnorGeomorphology and flood-plain vegetation of the Sprague and lower Sycan Rivers, Klamath Basin, Oregon
This study provides information on channel and flood-plain processes and historical trends to guide effective restoration and monitoring strategies for the Sprague River Basin, a primary tributary (via the lower Williamson River) of Upper Klamath Lake, Oregon. The study area covered the lower, alluvial segments of the Sprague River system, including the lower parts of the Sycan River, North Fork SAuthorsJames E. O'Connor, Patricia F. McDowell, Pollyanna Lind, Christine G. Rasmussen, Mackenzie K. KeithOrganic matters: investigating the sources, transport, and fate of organic matter in Fanno Creek, Oregon
The term organic matter refers to the remnants of all living material. This can include fallen leaves, yard waste, animal waste, downed timber, or the remains of any other plant and animal life. Organic matter is abundant both on land and in water. Investigating organic matter is necessary for understanding the fate and transport of carbon (a major constituent of organic matter). Organic matter isAuthorsSteven Sobieszczyk, Mackenzie K. Keith, Jami H. Goldman, Stewart A. RoundsInvestigating organic matter in Fanno Creek, Oregon, Part 1 of 3: estimating annual foliar biomass for a deciduous-dominant urban riparian corridor
For this study, we explored the amount, type, and distribution of foliar biomass that is deposited annually as leaf litter to Fanno Creek and its floodplain in Portland, Oregon, USA. Organic matter is a significant contributor to the decreased dissolved oxygen concentrations observed in Fanno Creek each year and leaf litter is amongst the largest sources of organic matter to the stream channel andAuthorsSteven Sobieszczyk, Mackenzie K. Keith, Stewart A. Rounds, Jami H. GoldmanInvestigating organic matter in Fanno Creek, Oregon, Part 3 of 3: identifying and quantifying sources of organic matter to an urban stream
The sources, transport, and characteristics of organic matter (OM) in Fanno Creek, an urban stream in northwest Oregon, were assessed and quantified using: (1) optical instruments to calculate transported loads of dissolved, particulate, and total organic carbon, (2) fluorescence spectroscopy and stable isotope ratios (δ13C, δ15N) to elucidate sources and chemical properties of OM throughout the bAuthorsJami H. Goldman, Stewart A. Rounds, Mackenzie K. Keith, Steven SobieszczykInvestigating organic matter in Fanno Creek, Oregon, Part 2 of 3: sources, sinks, and transport of organic matter with fine sediment
Organic matter (OM) is abundant in Fanno Creek, Oregon, USA, and has been tied to a variety of water-quality concerns, including periods of low dissolved oxygen downstream in the Tualatin River, Oregon. The key sources of OM in Fanno Creek and other Tualatin River tributaries have not been fully identified, although isotopic analyses from previous studies indicated a predominantly terrestrial sourAuthorsMackenzie K. Keith, Steven Sobieszczyk, Jami H. Goldman, Stewart A. RoundsAssessing inundation hazards to nuclear powerplant sites using geologically extended histories of riverine floods, tsunamis, and storm surges
Most nuclear powerplants in the United States are near rivers, large lakes, or oceans. As evident from the Fukushima Daiichi, Japan, disaster of 2011, these water bodies pose inundation threats. Geologic records can extend knowledge of rare hazards from flooding, storm surges, and tsunamis. This knowledge can aid in assessing the safety of critical structures such as dams and energy plants, for whAuthorsJim O'Connor, Brian F. Atwater, Timothy A. Cohn, Thomas M. Cronin, Mackenzie K. Keith, Christopher G. Smith, Robert R. Mason,Geologic and physiographic controls on bed-material yield, transport, and channel morphology for alluvial and bedrock rivers, western Oregon
The rivers of western Oregon have diverse forms and characteristics, with channel substrates ranging from continuous alluvial gravel to bare bedrock. Analysis of several measurable morphologic attributes of 24 valley reaches on 17 rivers provides a basis for comparing nonalluvial and alluvial channels. Key differences are that alluvial reaches have greater bar area, greater migration rates, and shAuthorsJames E. O'Connor, Joseph F. Mangano, Scott A. Anderson, J. Rose Wallick, Krista L. Jones, Mackenzie K. KeithGeomorphic and vegetation processes of the Willamette River floodplain, Oregon: current understanding and unanswered science questions
This report summarizes the current understanding of floodplain processes and landforms for the Willamette River and its major tributaries. The area of focus encompasses the main stem Willamette River above Newberg and the portions of the Coast Fork Willamette, Middle Fork Willamette, McKenzie, and North, South and main stem Santiam Rivers downstream of U.S. Army Corps of Engineers dams. These reacAuthorsJ. Rose Wallick, Krista L. Jones, Jim E. O'Connor, Mackenzie K. Keith, David Hulse, Stanley V. GregoryPreliminary assessment of channel stability and bed-material transport in the Tillamook Bay tributaries and Nehalem River basin, northwestern Oregon
This report summarizes a preliminary study of bed-material transport, vertical and lateral channel changes, and existing datasets for the Tillamook (drainage area 156 square kilometers [km2]), Trask (451 km2), Wilson (500 km2), Kilchis (169 km2), Miami (94 km2), and Nehalem (2,207 km2) Rivers along the northwestern Oregon coast. This study, conducted in coopera-tion with the U.S. Army Corps of EngAuthorsKrista L. Jones, Mackenzie K. Keith, Jim E. O'Connor, Joseph F. Mangano, J. Rose WallickGeomorphic response of the Sandy River, Oregon, to removal of Marmot Dam
The October 2007 breaching of a temporary cofferdam constructed during removal of the 15-meter (m)-tall Marmot Dam on the Sandy River, Oregon, triggered a rapid sequence of fluvial responses as ~730,000 cubic meters (m3) of sand and gravel filling the former reservoir became available to a high-gradient river. Using direct measurements of sediment transport, photogrammetry, airborne light detectioAuthorsJon J. Major, Jim E. O'Connor, Charles J. Podolak, Mackenzie K. Keith, Gordon E. Grant, Kurt R. Spicer, Smokey Pittman, Heather M. Bragg, J. Rose Wallick, Dwight Q. Tanner, Abagail Rhode, Peter R. WilcockNon-USGS Publications**
Podolak, C.J., Major, J.J., Keith, M.K., O’Connor, J.E., and Wallick, J.R., 2010, One River’s Response to large dam removal, in Vignettes- on-line case study supplements to Bierman, Paul and Montgomery, David, (eds.), Key Concepts in Geomorphology: W.H. Freemen, Vermont, on-line supplement available at http://serc.carleton.edu/39733.Podolak, C.J., Major, J.J., Keith, M.K., O’Connor, J.E., and Wallick, J.R., 2010, (Sediment) Accounting 101: An Example, in Vignettes- on-line case study supplements to Bierman, Paul and Montgomery, David, (eds.), Key Concepts in Geomorphology: W.H. Freemen, Vermont, on-line supplement available at http://serc.carleton.edu/39732.**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
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Below are data sets that Mackenzie Keith has authored.
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