Anna Maher
Anna is a hydrologist with the Oregon Water Science Center's Groundwater Team.
Science and Products
Statewide base-flow estimates for Oregon, water years 1980–2023 Statewide base-flow estimates for Oregon, water years 1980–2023
Base flow, the groundwater contribution to streamflow, is beneficial data for analysis of groundwater-flow systems. This data release includes base-flow estimates and streamflow data for 471 Oregon streamgage sites. Categories of data include: (1) site information, (2) water year estimates of base flow and streamflow, and (3) daily estimates of base flow. Water-year base-flow estimates...
Geochemical data for groundwater and surface water in the Umatilla River basin, Oregon, 2014–2022 Geochemical data for groundwater and surface water in the Umatilla River basin, Oregon, 2014–2022
This USGS data release presents data used to estimate and summarize where and when recharge occurs to the Columbia River Basalt Group (CRBG) in the Umatilla River basin, Oregon, 2014–2022. The supplemental data consist of two child items. The child items are: (1) Discrete geochemical data for groundwater and surface water samples in the Umatilla River basin, 2014–2022, and (2) Dissolved...
Comparison of environmental flow recommendations for the Willamette Basin Sustainable Rivers Program, water years 2008-2022 Comparison of environmental flow recommendations for the Willamette Basin Sustainable Rivers Program, water years 2008-2022
The U.S. Army Corps of Engineers (USACE) and the Nature Conservancy developed the Sustainable Rivers Program (SRP) as a collaborative environmental flows program to identify, refine, and implement environmental strategies at select USACE dams. The SRP was introduced to the Willamette Basin, Oregon, in 2007 through a series of environmental flow workshops, which led to stakeholder...
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...
Timing and source of recharge to the Columbia River Basalt groundwater system in northeastern Oregon Timing and source of recharge to the Columbia River Basalt groundwater system in northeastern Oregon
Recharge to and flow within the Columbia River Basalt Group (CRBG) groundwater flow system of northeastern Oregon were characterized using isotopic, gas, and age-tracer samples from wells completed in basalt, springs, and stream base flow. Most groundwater samples were late-Pleistocene to early-Holocene; median age of well samples was 11,100 years. The relation between mean groundwater...
Authors
Henry Johnson, Kate Ely, Anna-Turi Maher
Hydrogeology and groundwater geochemistry of till confining units and confined aquifers in glacial deposits near Litchfield, Cromwell, Akeley, and Olivia, Minnesota, 2014–18 Hydrogeology and groundwater geochemistry of till confining units and confined aquifers in glacial deposits near Litchfield, Cromwell, Akeley, and Olivia, Minnesota, 2014–18
Confined (or buried) aquifers of glacial origin overlain by till confining units provide drinking water to hundreds of thousands of Minnesota residents. The sustainability of these groundwater resources is not well understood because hydraulic properties of till that control vertical groundwater fluxes (leakage) to underlying aquifers are largely unknown. The U.S. Geological Survey, Iowa...
Authors
Jared Trost, Anna-Turi Maher, William Simpkins, Alyssa Witt, James R. Stark, Justin Blum, Andrew Berg
Science and Products
Statewide base-flow estimates for Oregon, water years 1980–2023 Statewide base-flow estimates for Oregon, water years 1980–2023
Base flow, the groundwater contribution to streamflow, is beneficial data for analysis of groundwater-flow systems. This data release includes base-flow estimates and streamflow data for 471 Oregon streamgage sites. Categories of data include: (1) site information, (2) water year estimates of base flow and streamflow, and (3) daily estimates of base flow. Water-year base-flow estimates...
Geochemical data for groundwater and surface water in the Umatilla River basin, Oregon, 2014–2022 Geochemical data for groundwater and surface water in the Umatilla River basin, Oregon, 2014–2022
This USGS data release presents data used to estimate and summarize where and when recharge occurs to the Columbia River Basalt Group (CRBG) in the Umatilla River basin, Oregon, 2014–2022. The supplemental data consist of two child items. The child items are: (1) Discrete geochemical data for groundwater and surface water samples in the Umatilla River basin, 2014–2022, and (2) Dissolved...
Comparison of environmental flow recommendations for the Willamette Basin Sustainable Rivers Program, water years 2008-2022 Comparison of environmental flow recommendations for the Willamette Basin Sustainable Rivers Program, water years 2008-2022
The U.S. Army Corps of Engineers (USACE) and the Nature Conservancy developed the Sustainable Rivers Program (SRP) as a collaborative environmental flows program to identify, refine, and implement environmental strategies at select USACE dams. The SRP was introduced to the Willamette Basin, Oregon, in 2007 through a series of environmental flow workshops, which led to stakeholder...
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...
Timing and source of recharge to the Columbia River Basalt groundwater system in northeastern Oregon Timing and source of recharge to the Columbia River Basalt groundwater system in northeastern Oregon
Recharge to and flow within the Columbia River Basalt Group (CRBG) groundwater flow system of northeastern Oregon were characterized using isotopic, gas, and age-tracer samples from wells completed in basalt, springs, and stream base flow. Most groundwater samples were late-Pleistocene to early-Holocene; median age of well samples was 11,100 years. The relation between mean groundwater...
Authors
Henry Johnson, Kate Ely, Anna-Turi Maher
Hydrogeology and groundwater geochemistry of till confining units and confined aquifers in glacial deposits near Litchfield, Cromwell, Akeley, and Olivia, Minnesota, 2014–18 Hydrogeology and groundwater geochemistry of till confining units and confined aquifers in glacial deposits near Litchfield, Cromwell, Akeley, and Olivia, Minnesota, 2014–18
Confined (or buried) aquifers of glacial origin overlain by till confining units provide drinking water to hundreds of thousands of Minnesota residents. The sustainability of these groundwater resources is not well understood because hydraulic properties of till that control vertical groundwater fluxes (leakage) to underlying aquifers are largely unknown. The U.S. Geological Survey, Iowa...
Authors
Jared Trost, Anna-Turi Maher, William Simpkins, Alyssa Witt, James R. Stark, Justin Blum, Andrew Berg