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 data sets that Mackenzie Keith has authored.
Filter Total Items: 21
Geomorphic Mapping for the lower Middle Fork Willamette River, Oregon in 2018 and 2020 Geomorphic Mapping for the lower Middle Fork Willamette River, Oregon in 2018 and 2020
Since 2008, large-scale restoration programs have been implemented along the Willamette River, Oregon, to address historical losses of floodplain habitats for native fish. For much of the Willamette River floodplain, direct enhancement of floodplain habitats through restoration activities is needed because the underlying hydrologic, geomorphic, and vegetation processes that historically...
Surficial and subsurface grain-size data for the Siletz River, Oregon, 2017-18 Surficial and subsurface grain-size data for the Siletz River, Oregon, 2017-18
The Siletz River Basin encompasses 970 square kilometers of western Oregon and drains to the Pacific Ocean. In cooperation with the Confederated Tribes of the Siletz Indians of Oregon (CTSI), the U.S. Geological Survey is evaluating how streamflow and bedload sediment conditions may influence mainstem spawning habitats for spring Chinook Salmon (Oncorhynchus tshawytschya) and Pacific...
Active channel mapping for the Siletz River, Oregon, 1939 to 2016 Active channel mapping for the Siletz River, Oregon, 1939 to 2016
The Siletz River Basin encompasses 970 square kilometers of western Oregon and drains to the Pacific Ocean. In cooperation with the Confederated Tribes of the Siletz Indians of Oregon (CTSI), the U.S. Geological Survey is evaluating how streamflow and bedload sediment conditions may influence mainstem spawning habitats for spring Chinook Salmon (Oncorhynchus tshawytschya) and Pacific...
Water temperature data to support effectiveness monitoring of channel and floodplain restoration projects along the Willamette River, Oregon (ver. 1.2, May 2024) Water temperature data to support effectiveness monitoring of channel and floodplain restoration projects along the Willamette River, Oregon (ver. 1.2, May 2024)
Continuous water-temperature data were collected at multiple sites along the Middle Fork and mainstem Willamette Rivers between Jasper and Newberg, Oregon, to support effectiveness monitoring for a large-scale channel and floodplain restoration program (Willamette Focused Investment Partnership, WFIP). Continuous water temperature loggers were deployed at a subset of WFIP restoration...
Geomorphic Mapping of Fall Creek Lake, Oregon, 2016 Geomorphic Mapping of Fall Creek Lake, Oregon, 2016
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...
Geomorphic and larval lamprey surveys in tributaries of the Umpqua River, Oregon Geomorphic and larval lamprey surveys in tributaries of the Umpqua River, Oregon
Interactions between geomorphic processes at multiple scales shape the distributions of habitats, species, and life stages that a river can support. Understanding these hierarchical processes may be helpful for proactive monitoring and restoration of native Western Brook Lamprey (Lampetra richardsoni) and Pacific Lamprey (Entosphenus tridentatus) in Pacific Northwest rivers. The...
Structure-from-motion datasets of Fall Creek Lake, Oregon, acquired during annual drawdown to streambed November 2016 Structure-from-motion datasets of Fall Creek Lake, Oregon, acquired during annual drawdown to streambed November 2016
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...
Fall Creek and Middle Fork Willamette Geomorphic Mapping Geodatabase Fall Creek and Middle Fork Willamette Geomorphic Mapping Geodatabase
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...
Surficial Particle Count and Clay Horizon Marker Data for Fall Creek and the Middle Fork Willamette River, Oregon in 2015-2017 Surficial Particle Count and Clay Horizon Marker Data for Fall Creek and the Middle Fork Willamette River, Oregon in 2015-2017
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...
Below are publications that Mackenzie Keith has authored.
Filter Total Items: 34
Geothermal implications of a refined composition-age geologic map for the volcanic terrains of southeast Oregon, northeast California, and southwest Idaho, USA Geothermal implications of a refined composition-age geologic map for the volcanic terrains of southeast Oregon, northeast California, and southwest Idaho, USA
Sufficient temperatures to generate steam likely exist under most of the dominantly volcanic terrains of southeast Oregon, northeast California, and southeast Idaho, USA, but finding sufficient permeability to allow efficient advective heat exchange is an outstanding challenge. A new thematic interpretation of existing state-level geologic maps provides an updated and refined...
Authors
Erick Burns, Marshall Gannett, David Sherrod, Mackenzie Keith, Jennifer Curtis, James Bartolino, John Engott, Benjamin Scandella, Michelle Stern, Alan Flint
Geomorphic response of the North Fork Stillaguamish River to the State Route 530 landslide near Oso, Washington Geomorphic response of the North Fork Stillaguamish River to the State Route 530 landslide near Oso, Washington
On March 22, 2014, the State Route 530 Landslide near Oso, Washington mobilized 8 million cubic meters of unconsolidated Pleistocene material, creating a valley‑spanning deposit that fully impounded the North Fork Stillaguamish River. The river overtopped the 8-meter high debris impoundment within 25 hours and began steadily incising a new channel through the center of the deposit...
Authors
Scott Anderson, Mackenzie K. Keith, Christopher Magirl, J. Rose Wallick, Mark Mastin, James Foreman
Summary of environmental flow monitoring for the Sustainable Rivers Project on the Middle Fork Willamette and McKenzie Rivers, western Oregon, 2014–15 Summary of environmental flow monitoring for the Sustainable Rivers Project on the Middle Fork Willamette and McKenzie Rivers, western Oregon, 2014–15
This report presents the results of an ongoing environmental flow monitoring study by The Nature Conservancy (TNC), U.S. Army Corps of Engineers (USACE), and U.S. Geological Survey in support of the Sustainable Rivers Project (SRP) of TNC and USACE. The overarching goal of this study is to evaluate and characterize relations between streamflow, geomorphic processes, and black cottonwood...
Authors
Krista Jones, Joseph Mangano, J. Rose Wallick, Heather Bervid, Melissa Olson, Mackenzie K. Keith, Leslie Bach
Preliminary assessment of aggradation potential in the North Fork Stillaguamish River downstream of the State Route 530 landslide near Oso, Washington Preliminary 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...
Authors
Christopher Magirl, Mackenzie K. Keith, Scott Anderson, Jim O’Connor, Robert Aldrich, Mark Mastin
Geologic and geomorphic controls on the occurrence of fens in the Oregon Cascades and implications for vulnerability and conservation Geologic 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...
Authors
A. Aldous, Marshall Gannett, Mackenzie K. Keith, James E. O'Connor
Geomorphology and flood-plain vegetation of the Sprague and lower Sycan Rivers, Klamath Basin, Oregon Geomorphology 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...
Authors
James E. O'Connor, Patricia McDowell, Pollyanna Lind, Christine Rasmussen, Mackenzie K. Keith
Organic matters: investigating the sources, transport, and fate of organic matter in Fanno Creek, Oregon Organic 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...
Authors
Steven Sobieszczyk, Mackenzie K. Keith, Jami Goldman, Stewart Rounds
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 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...
Authors
Steven Sobieszczyk, Mackenzie K. Keith, Stewart Rounds, Jami Goldman
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 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...
Authors
Jami Goldman, Stewart Rounds, Mackenzie K. Keith, Steven Sobieszczyk
Investigating organic matter in Fanno Creek, Oregon, Part 2 of 3: sources, sinks, and transport of organic matter with fine sediment Investigating 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...
Authors
Mackenzie K. Keith, Steven Sobieszczyk, Jami Goldman, Stewart Rounds
Assessing inundation hazards to nuclear powerplant sites using geologically extended histories of riverine floods, tsunamis, and storm surges Assessing 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...
Authors
Jim O’Connor, Brian Atwater, Timothy A. Cohn, Thomas Cronin, Mackenzie K. Keith, Christopher Smith, Mason
Geologic and physiographic controls on bed-material yield, transport, and channel morphology for alluvial and bedrock rivers, western Oregon 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...
Authors
James E. O'Connor, Joseph Mangano, Scott Anderson, J. Rose Wallick, Krista Jones, Mackenzie K. Keith
Non-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.
Science and Products
Below are data sets that Mackenzie Keith has authored.
Filter Total Items: 21
Geomorphic Mapping for the lower Middle Fork Willamette River, Oregon in 2018 and 2020 Geomorphic Mapping for the lower Middle Fork Willamette River, Oregon in 2018 and 2020
Since 2008, large-scale restoration programs have been implemented along the Willamette River, Oregon, to address historical losses of floodplain habitats for native fish. For much of the Willamette River floodplain, direct enhancement of floodplain habitats through restoration activities is needed because the underlying hydrologic, geomorphic, and vegetation processes that historically...
Surficial and subsurface grain-size data for the Siletz River, Oregon, 2017-18 Surficial and subsurface grain-size data for the Siletz River, Oregon, 2017-18
The Siletz River Basin encompasses 970 square kilometers of western Oregon and drains to the Pacific Ocean. In cooperation with the Confederated Tribes of the Siletz Indians of Oregon (CTSI), the U.S. Geological Survey is evaluating how streamflow and bedload sediment conditions may influence mainstem spawning habitats for spring Chinook Salmon (Oncorhynchus tshawytschya) and Pacific...
Active channel mapping for the Siletz River, Oregon, 1939 to 2016 Active channel mapping for the Siletz River, Oregon, 1939 to 2016
The Siletz River Basin encompasses 970 square kilometers of western Oregon and drains to the Pacific Ocean. In cooperation with the Confederated Tribes of the Siletz Indians of Oregon (CTSI), the U.S. Geological Survey is evaluating how streamflow and bedload sediment conditions may influence mainstem spawning habitats for spring Chinook Salmon (Oncorhynchus tshawytschya) and Pacific...
Water temperature data to support effectiveness monitoring of channel and floodplain restoration projects along the Willamette River, Oregon (ver. 1.2, May 2024) Water temperature data to support effectiveness monitoring of channel and floodplain restoration projects along the Willamette River, Oregon (ver. 1.2, May 2024)
Continuous water-temperature data were collected at multiple sites along the Middle Fork and mainstem Willamette Rivers between Jasper and Newberg, Oregon, to support effectiveness monitoring for a large-scale channel and floodplain restoration program (Willamette Focused Investment Partnership, WFIP). Continuous water temperature loggers were deployed at a subset of WFIP restoration...
Geomorphic Mapping of Fall Creek Lake, Oregon, 2016 Geomorphic Mapping of Fall Creek Lake, Oregon, 2016
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...
Geomorphic and larval lamprey surveys in tributaries of the Umpqua River, Oregon Geomorphic and larval lamprey surveys in tributaries of the Umpqua River, Oregon
Interactions between geomorphic processes at multiple scales shape the distributions of habitats, species, and life stages that a river can support. Understanding these hierarchical processes may be helpful for proactive monitoring and restoration of native Western Brook Lamprey (Lampetra richardsoni) and Pacific Lamprey (Entosphenus tridentatus) in Pacific Northwest rivers. The...
Structure-from-motion datasets of Fall Creek Lake, Oregon, acquired during annual drawdown to streambed November 2016 Structure-from-motion datasets of Fall Creek Lake, Oregon, acquired during annual drawdown to streambed November 2016
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...
Fall Creek and Middle Fork Willamette Geomorphic Mapping Geodatabase Fall Creek and Middle Fork Willamette Geomorphic Mapping Geodatabase
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...
Surficial Particle Count and Clay Horizon Marker Data for Fall Creek and the Middle Fork Willamette River, Oregon in 2015-2017 Surficial Particle Count and Clay Horizon Marker Data for Fall Creek and the Middle Fork Willamette River, Oregon in 2015-2017
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...
Below are publications that Mackenzie Keith has authored.
Filter Total Items: 34
Geothermal implications of a refined composition-age geologic map for the volcanic terrains of southeast Oregon, northeast California, and southwest Idaho, USA Geothermal implications of a refined composition-age geologic map for the volcanic terrains of southeast Oregon, northeast California, and southwest Idaho, USA
Sufficient temperatures to generate steam likely exist under most of the dominantly volcanic terrains of southeast Oregon, northeast California, and southeast Idaho, USA, but finding sufficient permeability to allow efficient advective heat exchange is an outstanding challenge. A new thematic interpretation of existing state-level geologic maps provides an updated and refined...
Authors
Erick Burns, Marshall Gannett, David Sherrod, Mackenzie Keith, Jennifer Curtis, James Bartolino, John Engott, Benjamin Scandella, Michelle Stern, Alan Flint
Geomorphic response of the North Fork Stillaguamish River to the State Route 530 landslide near Oso, Washington Geomorphic response of the North Fork Stillaguamish River to the State Route 530 landslide near Oso, Washington
On March 22, 2014, the State Route 530 Landslide near Oso, Washington mobilized 8 million cubic meters of unconsolidated Pleistocene material, creating a valley‑spanning deposit that fully impounded the North Fork Stillaguamish River. The river overtopped the 8-meter high debris impoundment within 25 hours and began steadily incising a new channel through the center of the deposit...
Authors
Scott Anderson, Mackenzie K. Keith, Christopher Magirl, J. Rose Wallick, Mark Mastin, James Foreman
Summary of environmental flow monitoring for the Sustainable Rivers Project on the Middle Fork Willamette and McKenzie Rivers, western Oregon, 2014–15 Summary of environmental flow monitoring for the Sustainable Rivers Project on the Middle Fork Willamette and McKenzie Rivers, western Oregon, 2014–15
This report presents the results of an ongoing environmental flow monitoring study by The Nature Conservancy (TNC), U.S. Army Corps of Engineers (USACE), and U.S. Geological Survey in support of the Sustainable Rivers Project (SRP) of TNC and USACE. The overarching goal of this study is to evaluate and characterize relations between streamflow, geomorphic processes, and black cottonwood...
Authors
Krista Jones, Joseph Mangano, J. Rose Wallick, Heather Bervid, Melissa Olson, Mackenzie K. Keith, Leslie Bach
Preliminary assessment of aggradation potential in the North Fork Stillaguamish River downstream of the State Route 530 landslide near Oso, Washington Preliminary 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...
Authors
Christopher Magirl, Mackenzie K. Keith, Scott Anderson, Jim O’Connor, Robert Aldrich, Mark Mastin
Geologic and geomorphic controls on the occurrence of fens in the Oregon Cascades and implications for vulnerability and conservation Geologic 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...
Authors
A. Aldous, Marshall Gannett, Mackenzie K. Keith, James E. O'Connor
Geomorphology and flood-plain vegetation of the Sprague and lower Sycan Rivers, Klamath Basin, Oregon Geomorphology 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...
Authors
James E. O'Connor, Patricia McDowell, Pollyanna Lind, Christine Rasmussen, Mackenzie K. Keith
Organic matters: investigating the sources, transport, and fate of organic matter in Fanno Creek, Oregon Organic 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...
Authors
Steven Sobieszczyk, Mackenzie K. Keith, Jami Goldman, Stewart Rounds
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 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...
Authors
Steven Sobieszczyk, Mackenzie K. Keith, Stewart Rounds, Jami Goldman
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 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...
Authors
Jami Goldman, Stewart Rounds, Mackenzie K. Keith, Steven Sobieszczyk
Investigating organic matter in Fanno Creek, Oregon, Part 2 of 3: sources, sinks, and transport of organic matter with fine sediment Investigating 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...
Authors
Mackenzie K. Keith, Steven Sobieszczyk, Jami Goldman, Stewart Rounds
Assessing inundation hazards to nuclear powerplant sites using geologically extended histories of riverine floods, tsunamis, and storm surges Assessing 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...
Authors
Jim O’Connor, Brian Atwater, Timothy A. Cohn, Thomas Cronin, Mackenzie K. Keith, Christopher Smith, Mason
Geologic and physiographic controls on bed-material yield, transport, and channel morphology for alluvial and bedrock rivers, western Oregon 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...
Authors
James E. O'Connor, Joseph Mangano, Scott Anderson, J. Rose Wallick, Krista Jones, Mackenzie K. Keith
Non-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.