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Nora Herrera

Nora Herrera is a hydrologist at the USGS Oregon Water Science Center.

Science and Products

Hydrogeologic framework and selected components of the groundwater budget for the upper Umatilla River Basin, Oregon

Executive SummaryThis report presents a summary of the hydrogeology of the upper Umatilla River Basin, Oregon, based on characterization of the hydrogeologic framework, horizontal and vertical directions of groundwater flow, trends in groundwater levels, and components of the groundwater budget. The conceptual model of the groundwater flow system integrates available data and information on the gr
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Water Resources Mission Area, Oregon Water Science Center

Simulation of groundwater flow and the interaction of groundwater and surface water in the Willamette Basin and Central Willamette subbasin, Oregon

Full appropriation of tributary streamflow during summer, a growing population, and agricultural needs are increasing the demand for groundwater in the Willamette Basin. Greater groundwater use could diminish streamflow and create seasonal and long-term declines in groundwater levels. The U.S. Geological Survey (USGS) and the Oregon Water Resources Department (OWRD) cooperated in a study to develo
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Water Resources Mission Area, Oregon Water Science Center, Geology, Minerals, Energy, and Geophysics Science Center

Ground-water hydrology of the Willamette basin, Oregon

The Willamette Basin encompasses a drainage of 12,000 square miles and is home to approximately 70 percent of Oregon's population. Agriculture and population are concentrated in the lowland, a broad, relatively flat area between the Coast and Cascade Ranges. Annual rainfall is high, with about 80 percent of precipitation falling from October through March and less than 5 percent falling in July an
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Water Resources Mission Area, Oregon Water Science Center

Conceptual evaluation of ground-water flow and simulated effects of changing irrigation practices on the shallow aquifer in the Fallon and Stillwater areas, Churchill County, Nevada

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Detroit Dam

Willamette River Basin Dissolved Gas Monitoring Network

USGS total dissolved gas (TDG) data help guide spill and discharge management from dams operated along tributaries of the Willamette River.
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Oregon Water Science Center
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Willamette River Basin Dissolved Gas Monitoring Network

USGS total dissolved gas (TDG) data help guide spill and discharge management from dams operated along tributaries of the Willamette River.
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Phreatophytic Shrublands and Grasslands, Historical (1990-2019) Trends in Groundwater Levels, Precipitation, and Air Temperature, Historical (1955-2016) Trends in Snow-Water Equivalent, and Projected Future (2040-99) Climate and Hydrology Anomalies across

This data release presents baseline datasets of phreatophytic groundwater-dependent ecosystem (GDE) locations in Oregon and trends in physical and environmental factors potentially influencing proximal groundwater supplies. The data release consists of three child items. The child items are: (1) Select Phreatophytic Shrub and Grass Species of Oregon, the Estimated Distribution of Phreatophytic
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Oregon Water Science Center
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Science and Products