Unified Interior Regions

California

The Southwest Region includes California, Nevada, and Arizona. The Regional Office, headquartered in Sacramento, provides Center oversight and support, facilitates internal and external collaborations, and works to further USGS strategic science directions.

States L2 Landing Page Tabs

Filter Total Items: 421
Date published: November 26, 2018
Status: Completed

Assessing the Feasibility of Artificial Recharge and Storage and the Effectiveness and Sustainability of Insitu Arsenic Removal in the North Buttes Area, Antelope Valley, California

Groundwater pumpage for agricultural and municipal supply has resulted in water-level declines of more than 200 ft in some parts of the Antelope Valley groundwater basin and land subsidence of more than 6 ft in some areas. Future urban growth, increased agricultural demand, and limits on the supply of imported water will continue to increase the demand for groundwater.

Contacts: Tracy Nishikawa
Date published: November 26, 2018
Status: Completed

Investigation of Linkages Between Management Practices Used in Sacramento-San Joaquin Delta Rice Production and Loads of Dissolved Organic Matter and Disinfection Byproduct Precursors

The primary objective of this study is to expand our current understanding of how to manage rice production in the Sacramento-San Joaquin Delta in a manner that minimizes loads of water quality contaminants to Delta waters.

Contacts: Jacob A Fleck
Date published: November 26, 2018
Status: Completed

Geohydrology of the Big Bear Valley

The study develops a greater understanding of the hydrology of the Big Bear Valley ground-water basin and allows the Big Bear Valley Community Services District to better manage and utilize the resource. The study will address the effects of urbanization and suburbanization on water resources and the effects of climate on water resources, issues 1 and 7 from the Strategic Directions for the...

Date published: November 26, 2018
Status: Completed

Central Basin Groundwater Contamination Study

The Central and West Coast groundwater basins provide nearly a third of the water supply to 43 cities in southern Los Angeles County. Over 250,000 afy are pumped from the basins for municipal and industrial use. To properly manage the ground-water resource and to ensure its future availability, it is necessary to identify and manage threats to the drinking water aquifers from surface...

Contacts: Michael T Land
Date published: November 20, 2018
Status: Completed

Spatially Explicit Mapping of Hydrologic Residence Time Paired with Water Quality Measurements to Determine the Effects of the Emergency Drought Barrier

The purpose of this study is to assess the distribution of water residence times across the central Delta using rapid water isotope measurements (δ2H, δ18O) made with a boat-based flow-through instrument.

Contacts: Bryan Downing
Date published: November 19, 2018
Status: Completed

Enterococcus Surface Protein as an Indicator of Human Fecal Pollution in the Lower Russian River Basin

Preliminary evaluation of water-quality data collected in the Lower Russian River Basin, Sonoma County, California during an on-going program by the U.S. Geological Survey (USGS), in cooperation with Sonoma County Water Agency (SCWA), indicated that there is considerable variability in bacterial concentrations from reach to reach and from year to year. Furthermore, tributaries that maintained...

Contacts: Robert Anders
Date published: November 19, 2018
Status: Completed

Simulation of Water Resources Management in the Pajaro Valley

Two key hydrologic issues in all coastal aquifer systems are the delineation and the management of the renewable water resources. The proper development and management of the renewable resources helps to minimize ground-water mining of the lower aquifer systems, and minimizes overdraft and seawater intrusion of the upper aquifer system while maximizing the sustainable yield of the renewable...

Date published: November 19, 2018
Status: Active

California Oil, Gas, and Groundwater (COGG) Program

The USGS California Water Science Center is working in partnership with state and federal agencies to answer the following questions about oil and gas development and groundwater resources:

Date published: November 19, 2018
Status: Completed

Hydrogeologic Characterization of the Modesto Area Ground-Water Basin and Evaluation of Water Resource Management Alternatives

Strategies for managing local water supplies and ground-water quality are being formulated and evaluated by the Stanislaus-Tuolumne River Groundwater Basin Association (STRGBA). 

Contacts: Steven Phillips
Date published: November 19, 2018
Status: Active

San Joaquin Basin Oil and Gas Assessments

The U.S. Geological Survey completed the following assessments of undiscovered continuous oil and gas resources of the Monterey Formation, San Joaquin Basin Province 5010.

    Date published: November 19, 2018
    Status: Active

    Sacramento Basin Oil and Gas Assessments

    The U.S. Geological Survey completed the following assessments of undiscovered natural gas resources of the Sacramento Basin Province of California 5008.

      Date published: November 16, 2018
      Status: Active

      Wildfires and Climate

      Over the last several decades, both the incidence of large wildfires and the duration of the wildfire season across much of the United States have increased (Westerling and others, 2006, American Water Works Assn, 2008; Finco and others, 2012). Future wildfire projections based on forecasted climate scenarios indicate both an increase in the expected severity of wildfires, and an...

      Filter Total Items: 588
      Date published: January 1, 2019

      CoSMoS (Coastal Storm Modeling System) Central California v3.1 wave-hazard projections: average conditions in San Mateo County

      This data contains maximum model-derived significant wave height (in meters) for the sea-level rise (SLR) and storm condition indicated.
      The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenar

      Date published: January 1, 2019

      CoSMoS (Coastal Storm Modeling System) Central California v3.1 water-level projections: 20-year storm in San Mateo County

      This data contains model-derived total water levels (in meters) for the sea-level rise (SLR) and storm condition indicated.
      The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenarios. Projecti

      Date published: January 1, 2019

      Structure-from-motion point cloud of Mud Creek, Big Sur, California, 2017-05-19

      Presented here is a point cloud collected by the U.S. Geological Survey (USGS) using an oblique plane-mounted camera system, covering the area of the Mud Creek landslide on California State Route 1 (SR1), Mud Creek, Big Sur, California. The point cloud is referenced to previously published lidar data and contains RGB information as well as XYZ. Point Cloud Coordinates are in NAD8

      Date published: January 1, 2019

      CoSMoS (Coastal Storm Modeling System) Central California v3.1 water-level projections: 100-year storm in Santa Barbara County

      This data contains model-derived total water levels (in meters) for the sea-level rise (SLR) and storm condition indicated.
      The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenarios. Projecti

      Date published: January 1, 2019

      CoSMoS (Coastal Storm Modeling System) Central California v3.1 water-level projections: 100-year storm in San Francisco County

      This data contains model-derived total water levels (in meters) for the sea-level rise (SLR) and storm condition indicated.
      The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenarios. Projecti

      Date published: January 1, 2019

      CoSMoS (Coastal Storm Modeling System) Central California v3.1 wave-hazard projections: 1-year storm in Santa Barbara County

      This data contains maximum model-derived significant wave height (in meters) for the sea-level rise (SLR) and storm condition indicated.
      The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenar

      Date published: January 1, 2019

      CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood depth and duration projections: average conditions in San Luis Obispo County

      This data contains maximum depth of flooding (cm) in the region landward of the present-day shoreline for the sea-level rise (SLR) and storm condition indicated.
      The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-le

      Date published: January 1, 2019

      CoSMoS (Coastal Storm Modeling System) Central California v3.1 wave-hazard projections: average conditions in San Luis Obispo County

      This data contains maximum model-derived significant wave height (in meters) for the sea-level rise (SLR) and storm condition indicated.
      The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-level rise (SLR) scenar

      Date published: January 1, 2019

      Fishes of Ryer Island, Suisun Bay, California, 2016-2017

      This data set includes field data for fishes sampled using gill nets and otter trawls during daylight hours in and around Ryer Island, Suisun Bay, California. This data release includes all measured environmental parameters and fish taxa included in the analysis.

      Date published: January 1, 2019

      CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood depth and duration projections: 1-year storm in San Luis Obispo County

      This data contains maximum depth of flooding (cm) in the region landward of the present-day shoreline for the sea-level rise (SLR) and storm condition indicated.
      The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of kilometers) of storm-induced coastal flooding and erosion for both current and future sea-le

      Date published: January 1, 2019

      Structure-from-motion point cloud of Mud Creek, Big Sur, California, 2017-12-21

      Presented here is a point cloud collected by the U.S. Geological Survey (USGS) using an oblique plane-mounted camera system, covering the area of the Mud Creek landslide on California State Route 1 (SR1), Mud Creek, Big Sur, California. Point cloud is referenced to previously published lidar data and contains RGB information as well as XYZ. Point cloud coordinates are in NAD83 UTM

      Date published: January 1, 2019

      Faults—Point Sur to Point Arguello, California

      This part of DS 781 presents data for the faults of the Point Sur to Point Arguello, California, region. The vector data file is included in the “Faults_PointSurToPointArguello.zip,” which is accessible from https://doi.org/10.5066/P97CZ0T7.
      Faults in the Point Sur to Point Arguello region are identified on seismic-reflection data based on...

      Filter Total Items: 485
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      Year Published: 2015

      California State Waters Map Series—Offshore of Fort Ross, California

      Introduction In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California’s State Waters. The CSMP approach is to create highly...

      Johnson, Samuel Y.; Cochran, Susan A.; Johnson, Samuel Y.; Dartnell, Peter; Golden, Nadine E.; Hartwell, Stephen R.; Erdey, Mercedes D.; Greene, H. Gary; Cochrane, Guy R.; Kvitek, Rikk G.; Manson, Michael W.; Endris, Charles A.; Dieter, Bryan E.; Watt, Janet T.; Krigsman, Lisa M.; Sliter, Ray W.; Lowe, Erik N.; Chin, John L.
      Johnson, S.Y., Dartnell, P., Golden, N.E., Hartwell, S.R., Erdey, M.D., Greene, H.G., Cochrane, G.R., Kvitek, R.G., Manson, M.W., Endris, C.A., Dieter, B.E., Watt, J.T., Krigsman, L.M., Sliter, R.W., Lowe, E.N., and Chin, J.L. (S.Y. Johnson and S.A. Cochran, eds.), 2015, California State Waters Map Series—Offshore of Fort Ross, California: U.S. Geological Survey Open-File Report 2015–1211, pamphlet 37 p., 10 sheets, scale 1:24,000, http://dx.doi.org/10.3133/ofr20151211.

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      Year Published: 2015

      The 2014 update to the National Seismic Hazard Model in California

      The 2014 update to the U. S. Geological Survey National Seismic Hazard Model in California introduces a new earthquake rate model and new ground motion models (GMMs) that give rise to numerous changes to seismic hazard throughout the state. The updated earthquake rate model is the third version of the Uniform California Earthquake Rupture Forecast...

      Powers, Peter M.; Field, Edward H.

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      Year Published: 2015

      Validation of simulated earthquake ground motions based on evolution of intensity and frequency content

      Simulated earthquake ground motions can be used in many recent engineering applications that require time series as input excitations. However, applicability and validation of simulations are subjects of debate in the seismological and engineering communities. We propose a validation methodology at the waveform level and directly based on...

      Rezaeian, Sanaz; Zhong, Peng; Hartzell, Stephen H.; Zareian, Farzin

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      Year Published: 2015

      Health and condition of endangered juvenile Lost River and shortnose suckers relative to water quality and fish assemblages in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California

      Executive Summary Most mortality of endangered Lost River (Deltistes luxatus) and shortnose (Chasmistes brevirostris) suckers in Upper Klamath Lake, Oregon, appears to occur within the first year of life. However, juvenile suckers in Clear Lake Reservoir, California, appear to survive longer and may even recruit to the spawning populations. Our...

      Burdick, Summer M.; Elliott, Diane G.; Ostberg, Carl O.; Conway, Carla M.; Dolan-Caret, Amari; Hoy, Marshal S.; Feltz, Kevin P.; Echols, Kathy R.
      Burdick, S.M., Elliott, D.G., Ostberg, C.O., Conway, C.M., Dolan-Caret, A., Hoy, M.S., Feltz, K.P., and Echols, K.R., 2015, Health and condition of endangered juvenile Lost River and shortnose suckers relative to water quality and fish assemblages in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California: U.S. Geological Survey Open-File Report 2015-1217, 56 p., http://dx.doi.org/10.3133/ofr20151217.

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      Year Published: 2015

      California State Waters map series—Offshore of Scott Creek, California

      Introduction In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California’s State Waters. The CSMP approach is to create highly...

      Cochrane, Guy R.; Cochran, Susan A.; Cochrane, Guy R.; Dartnell, Peter; Johnson, Samuel Y.; Greene, H. Gary; Erdey, Mercedes D.; Dieter, Bryan E.; Golden, Nadine E.; Endris, Charles A.; Hartwell, Stephen R.; Kvitek, Rikk G.; Davenport, Clifton W.; Watt, Janet T.; Krigsman, Lisa M.; Ritchie, Andrew C.; Sliter, Ray W.; Finlayson, David P.; Maier, Katherine L.
      Cochrane, G.R., Dartnell, P., Johnson, S.Y., Greene, H.G., Erdey, M.D., Dieter, B.E., Golden, N.E., Endris, C.A., Hartwell, S.R., Kvitek, R.G., Davenport, C.W., Watt, J.T., Krigsman, L.M., Ritchie, A.C., Sliter, R.W., Finlayson, D.P., and Maier, K.L. (G.R. Cochrane and S.A. Cochran, eds.), 2015, California State Waters Map Series—Offshore of Scott Creek, California: U.S. Geological Survey Open-File Report 2015–1191, pamphlet 40 p., 10 sheets, scale 1:24,000, http://dx.doi.org/10.3133/ofr20151191.

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      Year Published: 2015

      California State Waters Map Series—Offshore of Bodega Head, California

      Introduction In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California’s State Waters. The CSMP approach is to create highly...

      Johnson, Samuel Y.; Cochran, Susan A.; Johnson, Samuel Y.; Dartnell, Peter; Golden, Nadine E.; Hartwell, Stephen R.; Erdey, Mercedes D.; Greene, H. Gary; Cochrane, Guy R.; Kvitek, Rikk G.; Manson, Michael W.; Endris, Charles A.; Dieter, Bryan E.; Watt, Janet T.; Krigsman, Lisa M.; Sliter, Ray W.; Lowe, Erik N.; Chin, John L.
      Johnson, S.Y., Dartnell, P., Golden, N.E., Hartwell, S.R., Erdey, M.D., Greene, H.G., Cochrane, G.R., Kvitek, R.G., Manson, M.W., Endris, C.A., Dieter, B.E., Watt, J.T., Krigsman, L.M., Sliter, R.W., Lowe, E.N., and Chin, J.L. (S.Y. Johnson and S.A. Cochran, eds.), 2015, California State Waters Map Series—Offshore of Bodega Head, California: U.S. Geological Survey Open-File Report 2015–1140, pamphlet 39 p., 10 sheets, scale 1:24,000, http://dx.doi.org/10.3133/ofr20151140.

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      Year Published: 2015

      California State Waters Map Series: offshore of Bolinas, California

      Introduction In 2007, the California Ocean Protection Council initiated the California Seafloor Mapping Program (CSMP), designed to create a comprehensive seafloor map of high-resolution bathymetry, marine benthic habitats, and geology within the 3-nautical-mile limit of California’s State Waters. The CSMP approach is to create highly...

      Cochrane, Guy R.; Cochran, Susan A.; Cochrane, Guy R.; Dartnell, Peter; Johnson, Samuel Y.; Greene, H. Gary; Erdey, Mercedes D.; Golden, Nadine E.; Hartwell, Stephen R.; Manson, Michael W.; Sliter, Ray W.; Endris, Charles A.; Watt, Janet T.; Ross, Stephanie L.; Kvitek, Rikk G.; Phillips, Eleyne L.; Bruns, Terry R.; Chin, John L.
      Cochrane, G.R., Dartnell, P., Johnson, S.Y., Greene, H.G., Erdey, M.D., Golden, N.E., Hartwell, S.R., Manson, M.W., Sliter, R.W., Endris, C.A., Watt, J.T., Ross, S.L., Kvitek, R.G., Phillips, E.L., Bruns, T.R., and Chin, J.L. (G.R. Cochrane and S.A. Cochran, eds.), 2015, California State Waters Map Series—Offshore of Bolinas, California: U.S. Geological Survey Open-File Report 2015–1135, pamphlet 36 p., 10 sheets, http://dx.doi.org/10.3133/ofr20151135.

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      Year Published: 2015

      Lithostratigraphic, borehole-geophysical, hydrogeologic, and hydrochemical data from the East Bay Plain, Alameda County, California

      The U.S. Geological Survey, in cooperation with the East Bay Municipal Utility District, carried out an investigation of aquifer-system deformation associated with groundwater-level changes at the Bayside Groundwater Project near the modern San Francisco Bay shore in San Lorenzo, California. As a part of the Bayside Groundwater Project, East Bay...

      Sneed, Michelle; Orlando, Patricia v.P.; Borchers, James W.; Everett, Rhett R.; Solt, Michael; McGann, Mary; Lowers, Heather; Mahan, Shannon
      Sneed, Michelle, Orlando, P.v.P., Borchers, J.W., Everett, Rhett, Solt, Mike, McGann, Mary, Lowers, Heather, and Mahan, Shannon, 2015, Lithostratigraphic, borehole-geophysical, hydrogeologic, and hydrochemical data from the East Bay Plain, Alameda County, California: U.S. Geological Survey Data Series 890, 56 p., http://dx.doi.org/10.3133/ds890.

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      Year Published: 2015

      Effect of tides, river flow, and gate operations on entrainment of juvenile salmon into the interior Sacramento–San Joaquin River Delta

      Juvenile Chinook Salmon Oncorhynchus tshawytscha emigrating from natal tributaries of the Sacramento River, California, must negotiate the Sacramento-San Joaquin River Delta (hereafter, the Delta), a complex network of natural and man-made channels linking the Sacramento River with San Francisco Bay. Fish that enter the interior and southern Delta...

      Perry, Russell W.; Brandes, Patricia L.; Burau, Jon R.; Sandstrom, Philip T.; Skalski, John R.
      Perry, R.W., P.L. Brandes, J.R. Burau, P.T. Sandstrom, and J.R. Skalski. 2015. Effects of tides, river flow, and gate operations on entrainment of juvenile salmon into the interior Sacramento-San Joaquin River Delta. Trans. Am. Fish. Soc. 144(3): 445-455.

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      Year Published: 2015

      UCERF3: A new earthquake forecast for California's complex fault system

      With innovations, fresh data, and lessons learned from recent earthquakes, scientists have developed a new earthquake forecast model for California, a region under constant threat from potentially damaging events. The new model, referred to as the third Uniform California Earthquake Rupture Forecast, or "UCERF" (http://www.WGCEP.org/UCERF3),...

      Field, Edward H.
      Field, E.H., and 2014 Working Group on California Earthquake Probabilities, 2015, UCERF3: A new earthquake forecast for California’s complex fault system: U.S. Geological Survey 2015–3009, 6 p., http://dx.doi.org/10.3133/fs20153009.

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      Year Published: 2015

      Geochronology of Cenozoic rocks in the Bodie Hills, California and Nevada

      The purpose of this report is to present geochronologic data for unaltered volcanic rocks, hydrothermally altered volcanic rocks, and mineral deposits of the Miocene Bodie Hills and Pliocene to Pleistocene Aurora volcanic fields of east-central California and west-central Nevada. Most of the data presented here were derived from samples collected...

      Fleck, Robert J.; du Bray, Edward A.; John, David A.; Vikre, Peter G.; Cosca, Michael A.; Snee, Lawrence W.; Box, Stephen E.
      Fleck, R.J., du Bray, E.A., John, D.A., Vikre, P.G., Cosca, M.A., Snee, L.W., and Box, S.E., 2015, Geochronology of Cenozoic rocks in the Bodie Hills, California and Nevada: U.S. Geological Survey Data Series 916, 26 p., http://dx.doi.org/10.3133/ds916.

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      Year Published: 2015

      Long‐term time‐dependent probabilities for the third Uniform California Earthquake Rupture Forecast (UCERF3)

      The 2014 Working Group on California Earthquake Probabilities (WGCEP 2014) presents time-dependent earthquake probabilities for the third Uniform California Earthquake Rupture Forecast (UCERF3). Building on the UCERF3 time-independent model, published previously, renewal models are utilized to represent elastic-rebound-implied probabilities. A new...

      Field, Edward H.; Biasi, Glenn P.; Bird, Peter; Dawson, Timothy E.; Felzer, Karen R.; Jackson, David A.; Johnson, Kaj M.; Jordan, Thomas H.; Madden, Christopher; Michael, Andrew J.; Milner, Kevin; Page, Morgan T.; Parsons, Thomas E.; Powers, Peter; Shaw, Bruce E.; Thatcher, Wayne R.; Weldon, Ray J.; Zeng, Yuehua
      Field et al. (2015). Long-Term Time-Dependent Probabilities for the Third Uniform California Earthquake Rupture Forecast (UCERF3), Bulletin of the Seismological Society of America, Vol. 105, No. 2A, pp. 511–543, April 2015, doi: 10.1785/0120140093

      Filter Total Items: 1,119
      Image shows a crack in the ground with a truck in the background
      July 4, 2019

      Surface Rupture from Fault

      On July 4, 2019, a Magnitude 6.4 earthquake struck Searles Valley, CA. This photo provides likely evidence that the fault that hosted the earthquake ruptured to the ground surface.

      Mt. Diablo as seen from Twitchell Island
      July 2, 2019

      Mt. Diablo as seen from Twitchell Island

      Mt. Diablo as seen from Twitchell Island

       Close-up of a wetland, showing multiple sources of DOM
      July 2, 2019

      Close-up of a wetland, showing multiple sources of DOM

       Close-up of a wetland, showing multiple sources of DOM

      under a blue sky, golden grass, white rocks, and amber bushes fill a dried riverbed with rolling hills in the background
      June 30, 2019

      Vegetation Growth at a Once-Flooded Santa Ynez River

      Vegetation grows abundantly on a once-flooded region of the Santa Ynez River. Located 5 ft adjacent from this picture is the actual flowing region of the stream. It is impressive to see the abrupt change in vegetation near stream environments.  Golden grasses, brick red brush, blue sky, and rocks coated white from sun-dried/sun-bleached algae where water used to sustain

      ...
      June 27, 2019

      PubTalk 06/2019 — USGS Fire Science

      Title: USGS Fire Science: Understanding why wildlands burn and what can be done about it

      • Wildfires are expensive, dangerous, and have massive impacts on people and ecosystems, yet ecosystems evolved with wildland fire. 
      • USGS fire scientists help understand what factors affect wildland fire occurrence, intensity, spread, and effects. 
      • What can
      red and white round buoys strung across the blue water of the California Aqueduct
      June 26, 2019

      California Aqueduct, San Joaquin Valley

      The California Aqueduct flowing near Huron, CA in the San Joaquin Valley.  This spot is near one of several USGS land subsidence monitoring stations in the San Joaquin Valley. Land subsidence has reduced the conveyance capacity of the Aqueduct and other water

      ...
      at river's edge, a laptop displays graphs (foreground) while a hydrologist wades in the water with equipment (background)
      June 26, 2019

      Measuring Stream Discharge with Acoustic Doppler Current Profiler

      The USGS maintains and monitors hundreds of streamgages across California, as well as across the Nation. Nearly all data collected by the USGS is made public and most in near real-time. Cities can use the data for flood mitigation and water supply. Understanding the amount of water flowing in the watersheds all across America is essential to everything we do, as water is

      ...
      A woman kneels in a grassy area while taking a mud sample from the ground and placing it in a bag.
      June 19, 2019

      Wildfire history in the mud

      Marine geochemist Renee Takesue collects a sample of exposed mud in a marsh near Sonoma Creek, California. She will look here and in nearby San Pablo Bay for chemicals from the 2017 Nuns Wildfire that can harm wildlife. The stormy winter of 2018 may have transported these contaminants from the Sonoma Creek watershed into San Pablo Bay National Wildlife Refuge. This

      ...
      Sample being analyzed in a sealed quartz cuvette on the Aqualog.
      June 19, 2019

      Samples being analyzed on the Aqualog spectrometer

      Samples being analyzed in a sealed quartz cuvette on the Aqualog spectrophotometer

      USGS scientist samples an ocean sediment core
      June 19, 2019

      Sediment Cores Reveal the History of the Pacific Ocean

      USGS scientist Summer Praetorius collects samples from an ocean sediment core in the Pacific Ocean Paleoclimatology Lab at Menlo Park, CA. The sediment core is from Tanner Basin, located about 200 miles due west of San Diego in the eastern Pacific Ocean. This area is the southern-most extension of the California Current upwelling system, which brings cold nutrient-rich

      ...
      Photo taken close to the ground looking out at a shallow water inlet with a sand beach and grassy marsh area.
      June 19, 2019

      Napa River marsh

      Photo looking north at the Napa River marsh where USGS scientists collected sediment in 2019.

      In October 2017, the Atlas and Nuns wildfires each burned over 20,000 hectares in the Napa River and Sonoma Creek watersheds in the north San Francisco Bay area of California. Contaminants in wildfire runoff can originate from anthropogenic activities, from geologic sources

      ...
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      Man in orange safety suit and helmet, and thumb up,  standing while riding a personal watercraft
      January 12, 2017

      On January 13, scientists from the U.S. Geological Survey will be working on the beach in Santa Cruz at the mouth of the San Lorenzo River. Using a sonar-equipped boat and personal watercraft, they will be surveying the beach and the nearby ocean bottom to compile a three-dimensional map of how the beach changed during storms that struck this week.

      USGS: Science for a changing world
      January 10, 2017

      The U.S. Geological Survey’s California Water Science Center is hosting a media event Wednesday, Jan. 11 at a USGS streamgage location about 7 miles north of Santa Cruz, California. A hydrologist will be available for interviews as field crews collect streamflow data.

       

      Image: USGS Logo
      January 8, 2017

      The U.S. Geological Survey’s California Water Science Center is hosting a media event Monday, Jan. 9 at a USGS streamgage location below Friant Dam, a streamflow site with significance to the San Juan River Restoration Project.

      A man sits at a desk in front of a computer monitor and keyboard, pointing to the image and talking.
      December 30, 2016

      USGS scientists and their coauthors from the California Coastal Records Project have found a way to use historical aerial photographs not just to see evidence of coastal erosion, but to accurately measure how much has occurred over time.

      Nevada Earthquake Swarm December 28, 2016...
      December 28, 2016

      Three jolting earthquakes occurred in the wee hours this morning near Hawthorne NV, with two M5.7 events and a M5.5 occurring between the hours of 12:18 AM PST and 1:13 AM PST.

      Round, blue street sign with a white wave.
      December 15, 2016

      Interior Secretary talks with USGS geophysicist Stephanie Ross

      December 13 - 14, 2016 Long Valley Caldera earthquake swarm recorde...
      December 14, 2016

      A short-lived earthquake swarm occurred overnight under the Long Valley Caldera in eastern California about 4 km (2.5 mi) ESE of the town of Mammoths Lakes. The swarm does not appear to be related to increased volcanic unrest.

      Image: AGU Fall Meeting Street Pedestrians
      December 8, 2016

      Their days often start with breakfast meetings and end with working dinners. They give presentations to hundreds of their peers, debate fine points in crowded poster halls, and catch up with colleagues in long refreshment lines.

      still waters reflecting image of grasses growing next to it, with bright blue sky.
      November 15, 2016

      Successfully resolving California’s long-standing water supply and ecosystem restoration conflicts in the Delta requires developing sound policy solutions based on data derived from the best available science.

      USGS science for a changing world logo
      November 14, 2016

      Residents should not be alarmed to witness a low-flying helicopter over the eastern Mojave Desert starting around November 14.

      still waters reflecting image of grasses growing next to it, with bright blue sky.
      November 9, 2016

      Scientists, engineers and resource managers meet in Sacramento to explore the theme of “Science for Solutions: Linking Data and Decisions” at the 9th Biennial Bay-Delta Science Conference.

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