The San Antonio Creek Valley watershed (SACVW) is located in western Santa Barbara County about 15 miles (mi) south of Santa Maria, California and 55 mi north of Santa Barbara, California. The SACVW, is about 140 square miles and encompasses the San Antonio Creek Valley groundwater basin; From the late 1800s, groundwater has been the primary source of water for agricultural, military, municipal, and domestic uses. Groundwater withdrawal from pumping has exceeded the amount of water replenishing the basin, causing groundwater declines of more than 150 feet in parts of the valley between 1943 and 2017, and reducing base flow in San Antonio Creek at the western end of the SACVW. Agricultural water use (primarily for the present-day irrigation of vineyards, and bush fruit and berry crops), and the lack of other sources of water, has, and will continue to strain the sustainability of the groundwater system. To address these concerns, the U.S. Geological Survey (USGS) entered into a cooperative agreement with the Santa Barbara County Water Agency and Vandenberg Space Force Base to develop a better understanding of the hydrogeologic system, and to provide tools to help evaluate and manage the effects of future development of the San Antonio Creek Valley groundwater basin, and in the encompassing SACVW. These datasets collected in this effort are being used to assist in the development a numerical integrated hydrologic model of the SACVW. As part of this study the USGS collected hydrogeologic field data. Field data included streambed infiltrometer and aquifer slug tests, and measurements from streambed electrical resistivity instruments and temperature rod sensors. Infiltrometer tests provided data that can be used to estimate infiltration rate, streambed hydraulic conductivity and specific yield in the SACVW. Aquifer slug tests provided data that can be used to estimate hydraulic conductivity of aquifer units. Streambed electrical resistivity instruments provided data that can be used to estimate stream intermittency and flow patterns, and temperature rod sensors provided data that can be used to estimate streamflow infiltration.

The San Antonio Creek Valley watershed (SACVW) is located in western Santa Barbara County about 15 miles (mi) south of Santa Maria, California and 55 mi north of Santa Barbara, California. The SACVW, is about 140 square miles and encompasses the San Antonio Creek Valley groundwater basin. Since the late 1800s, groundwater has been the primary source of water for agricultural, military, municipal, and domestic uses. Groundwater withdrawal from pumping has exceeded the amount of water replenishing the basin, causing groundwater declines of more than 150 feet in parts of the valley between 1947 and 2018, and reducing base flow in San Antonio Creek at the western end of the SACVW. Agricultural water use (primarily for the present-day irrigation of vineyards, and fruit and berry crops), and the lack of other sources of water, has, and will continue to strain the sustainability of the groundwater system. To address these concerns, the Santa Barbara County Water Agency and Vandenberg Space Force Base invited the U.S. Geological Survey (USGS) to engage in a cooperative study to develop a better understanding of the hydrogeologic system, and to provide tools to help evaluate and manage the effects of future development of the San Antonio Creek Valley groundwater basin, and in the encompassing SACVW. Datasets collected as part of this effort were used to assist in the development a numerical integrated hydrologic model of the SACVW. As part of this study the USGS collected hydrogeologic field data and developed a three-dimensional hydrogeologic framework model (HFM) of the SACVW. Hydrogeologic field data included streambed infiltrometer and aquifer slug tests, and measurements from streambed electrical resistivity instruments and temperature rod sensors. The HFM provided a quantitative framework of the aquifer system, including the thickness and extent of each of six hydrogeologic units that comprise the basin-fill aquifer. Infiltrometer tests provided data that can be used to estimate infiltration rate, streambed hydraulic conductivity and specific yield in the SACVW. Aquifer slug tests provided data that can be used to estimate hydraulic conductivity of aquifer units. Streambed electrical resistivity instruments provided data that can be used to estimate stream intermittency and flow patterns, and temperature rod sensors provided data that can be used to estimate streamflow infiltration.

The San Antonio Creek Valley watershed (SACVW) is located in western Santa Barbara County about 15 miles (mi) south of Santa Maria, California and 55 mi north of Santa Barbara, California. The SACVW, is about 140 square miles and encompasses the San Antonio Creek Valley groundwater basin. Since the late 1800s, groundwater has been the primary source of water for agricultural, military, municipal, and domestic uses. Groundwater withdrawal from pumping has exceeded the amount of water replenishing the basin, causing groundwater declines of more than 150 feet in parts of the valley between 1947 and 2018, and reducing base flow in San Antonio Creek at the western end of the SACVW. Agricultural water use (primarily for the present-day irrigation of vineyards, and fruit and berry crops), and the lack of other sources of water, has, and will continue to strain the sustainability of the groundwater system. To address these concerns, the Santa Barbara County Water Agency and Vandenberg Space Force Base invited the U.S. Geological Survey (USGS) to engage in a cooperative study to develop a better understanding of the hydrogeologic system, and to provide tools to help evaluate and manage the effects of future development of the San Antonio Creek Valley groundwater basin, and in the encompassing SACVW. Datasets collected as part of this effort were used to assist in the development a numerical integrated hydrologic model of the SACVW. As part of this study the USGS collected hydrogeologic field data and developed a three-dimensional hydrogeologic framework model (HFM) of the SACVW. Hydrogeologic field data included streambed infiltrometer and aquifer slug tests, and measurements from streambed electrical resistivity instruments and temperature rod sensors. The HFM provided a quantitative framework of the aquifer system, including the thickness and extent of each of six hydrogeologic units that comprise the basin-fill aquifer. Infiltrometer tests provided data that can be used to estimate infiltration rate, streambed hydraulic conductivity and specific yield in the SACVW. Aquifer slug tests provided data that can be used to estimate hydraulic conductivity of aquifer units. Streambed electrical resistivity instruments provided data that can be used to estimate stream intermittency and flow patterns, and temperature rod sensors provided data that can be used to estimate streamflow infiltration.

The U.S. Geological Survey (USGS) entered into cooperative agreements with the Santa Barbara County Water Agency and Vandenberg Space Force Base to conduct a hydrologic resource assessment and develop an integrated numerical hydrologic model of the San Antonio Creek Valley watershed (SACVW). As part of this study, the USGS developed a digital three-dimensional hydrogeologic framework model (HFM). This dataset contains a geospatial database related to the digital HFM, individual geographic information system (GIS) shapefiles from the geodatabase, and borehole data used to support development of the HFM in a Microsoft Excel workbook (*.xlsx extension). The geospatial database contains the following data elements: (1) a boundary polygon that defines the HFM extent; (2) line features that define the location of faults used in the HFM; (3) a point dataset defining location of boreholes used in HFM construction; and (4) a polygon feature class containing interpolated elevations and thicknesses of hydrogeologic units as a cellular array. The spatial data are accompanied by non-spatial tables that describe the sources of geologic information, a glossary of terms, a description of model units, and a Data Dictionary. Spatial data are also presented as shapefiles and borehole data are provided in Mircosoft Excel spreadsheet.

The U.S. Geological Survey (USGS) entered into cooperative agreements with the Santa Barbara County Water Agency and Vandenberg Space Force Base to conduct a hydrologic resource assessment and develop an integrated numerical hydrologic model of the San Antonio Creek Valley watershed (SACVW). As part of this study, the USGS developed a digital three-dimensional hydrogeologic framework model (HFM). This dataset contains a geospatial database related to the digital HFM, individual geographic information system (GIS) shapefiles from the geodatabase, and borehole data used to support development of the HFM in a Microsoft Excel workbook (*.xlsx extension). The geospatial database contains the following data elements: (1) a boundary polygon that defines the HFM extent; (2) line features that define the location of faults used in the HFM; (3) a point dataset defining location of boreholes used in HFM construction; and (4) a polygon feature class containing interpolated elevations and thicknesses of hydrogeologic units as a cellular array. The spatial data are accompanied by non-spatial tables that describe the sources of geologic information, a glossary of terms, a description of model units, and a Data Dictionary. Spatial data are also presented as shapefiles and borehole data are provided in Mircosoft Excel spreadsheet.

This digital dataset contains the locations of, and links to USGS gages on the surface-water network for the Central Valley Hydrologic Model (CVHM). The Central Valley encompasses an approximate 50,000 square-kilometer region of California. The complex hydrologic system of the Central Valley is simulated using the USGS numerical modeling code MODFLOW-FMP (Schmidt and others, 2006b). This simulation is referred to here as the CVHM (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM simulates groundwater and surface-water flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley on a monthly basis from 1961-2003. The total active modeled area is 20,334 square-miles. The CVHM includes complex surface-water management processes. The hydrology of the present-day Central Valley and the CVHM model are driven by surface-water deliveries and associated groundwater pumpage. The Streamflow Routing Package (SFR1) is linked to MODFLOW-FMP to facilitate the simulated conveyance of surface-water deliveries. If surface-water deliveries do not meet the farm-delivery requirement, the FMP invokes simulated groundwater pumping to meet the demand. The surface-water network represents a subset of the entire stream network in the valley. Even so, it covers about 3,000 kilometers of surface-water and is simulated using 208 stream segments that represent 2244 stream reaches, with 43 inflows and 66 diversion locations providing 64 routed and 41 non-routed deliveries. Most of these inflows are regulated by dams and most of the deliveries are conveyed through an extensive canal network. The routed deliveries are conveyed through the simulated surface-water network, while the non-routed delivery conveyance typically occurs through small canals or diversion ditches and are not directly simulated. Much of the surface-water diversion and delivery information was compiled by the California Department of Water Resources (DWR) for 21 water-balance subregions (WBSs) covering the valley floor (C. Brush, California Department of Water Resources, written commun., February 21, 2007). The CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. Geological Survey (USGS). The CVHM was developed as part of the USGS Groundwater Resources Program (see "Foreword", Chapter A, page iii, for details).

This digital dataset contains the locations of, and links to USGS gages on the surface-water network for the Central Valley Hydrologic Model (CVHM). The Central Valley encompasses an approximate 50,000 square-kilometer region of California. The complex hydrologic system of the Central Valley is simulated using the USGS numerical modeling code MODFLOW-FMP (Schmidt and others, 2006b). This simulation is referred to here as the CVHM (Faunt, 2009). Utilizing MODFLOW-FMP, the CVHM simulates groundwater and surface-water flow, irrigated agriculture, land subsidence, and other key processes in the Central Valley on a monthly basis from 1961-2003. The total active modeled area is 20,334 square-miles. The CVHM includes complex surface-water management processes. The hydrology of the present-day Central Valley and the CVHM model are driven by surface-water deliveries and associated groundwater pumpage. The Streamflow Routing Package (SFR1) is linked to MODFLOW-FMP to facilitate the simulated conveyance of surface-water deliveries. If surface-water deliveries do not meet the farm-delivery requirement, the FMP invokes simulated groundwater pumping to meet the demand. The surface-water network represents a subset of the entire stream network in the valley. Even so, it covers about 3,000 kilometers of surface-water and is simulated using 208 stream segments that represent 2244 stream reaches, with 43 inflows and 66 diversion locations providing 64 routed and 41 non-routed deliveries. Most of these inflows are regulated by dams and most of the deliveries are conveyed through an extensive canal network. The routed deliveries are conveyed through the simulated surface-water network, while the non-routed delivery conveyance typically occurs through small canals or diversion ditches and are not directly simulated. Much of the surface-water diversion and delivery information was compiled by the California Department of Water Resources (DWR) for 21 water-balance subregions (WBSs) covering the valley floor (C. Brush, California Department of Water Resources, written commun., February 21, 2007). The CVHM is the most recent regional-scale model of the Central Valley developed by the U.S. Geological Survey (USGS). The CVHM was developed as part of the USGS Groundwater Resources Program (see "Foreword", Chapter A, page iii, for details).

This map shows the USGS (United States Geologic Survey), NWIS (National Water Inventory System) Hydrologic Data Sites for San Juan County, Utah. The scope and purpose of NWIS is defined on the web site: http://water.usgs.gov/public/pubs/FS/FS-027-98/

This geologic map database consists of new geologic mapping, at a 1:24,000 scale, along the southern part of the Bartlett Springs Fault Zone in the northern Coast Ranges, California. The geologic map (published as Scientific Investigations Map 3514) covers an area of 258 square miles in Lake, Napa, Colusa, and Yolo Counties; work, which was undertaken between 2016 and 2021, was supported by the USGS National Cooperative Geologic Mapping Program. This geodatabase contains the most up-to-date and highest resolution mapping in the region. Results and observations reported here help elucidate the geologic deformational history of the area, as well as the relation between older and active structures. Please consult the accompanying pamphlet and the Description of Map Units (in the pamphlet) for a detailed presentation and interpretation of data and discussion of results. The report contains the pamphlet and two map sheets that include the geologic map, a Correlation of Map Units, four geologic-structure cross sections, six microseismicity cross sections, and a microseismicity fault map.

This report and associated dataset, contains subsurface geologic information collected in the Sacramento-San Joaquin Valley. The primary data includes X, Y, Z locations of stratigraphic horizons and, to a much lesser extent, geologic structures where penetrated by oil and gas wells in the subsurface as recorded in well logs and well records. Selected oil and gas wells are not only examined for depth to stratigraphic horizon data, but also marked if deviated from vertical, or containing specific electronic logs that may be used for geophysical research. The data was compiled from well records made available through the California Department of Conservation, Geologic Energy Management Division (CalGEM) Well Finder web interface. Well Finder provides a map view of wells and fields with links to well records in the CalGEM database. Select records for wells in the study area (principally the well data report, which is a PDF copy of all the forms and associated "paperwork" filed with CalGEM and its predecessor state agencies, and the standard Spontaneous-Potential/Resistivity/Conductivity electric log) were requested, downloaded, and examined. Measurements of depth to geologic features (horizons) such as top or bottom of a geologic unit that are recorded in the well records were compiled into the data set, along with information about the location and identity of the well, and whether the well records available include other types of well log that are commonly of interest to 3D mappers. We also recorded if the well record mentioned that the well is deviated (not entirely vertical), which would affect the true X,Y,Z location of recorded horizons. However, we did not attempt to correct the data to account for the deviation. The values in the data set are those recorded in the well records. We also harvested the same information from the previously published USGS Open-File Report 2011-1262 (Brabb, 2011). Where there are many wells close together, we examined well records until finding a well with a relatively large suite of horizon depths recorded, and then used that well as representative of the many closely spaced wells. The goal was to get a good representation of the regional subsurface, not to record every well. In addition, we did not record all the information available in the well records for those wells in this dataset. The full records are freely available from the data sources. This dataset includes specific information compiled for the purpose described below. The information in this metadata file mainly describes the details of the contents and formats of the digital files.