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The Pacific Region has nine USGS Science Centers in California, Nevada, and Hawaii. The Regional Office, headquartered in Sacramento, provides Center oversight and support, facilitates internal and external collaborations, and works to further USGS strategic science directions.

News

SEDHYD Conference Image
May 17, 2019

California Water Science Center (CAWSC) hydrologists Joseph Hevesi, Scott Wright, Alexandra Etheridge, Mathieu Marineau, and Michelle Stern will discuss their research at the 2019 Federal Interagency Sedimentation and Hydrologic Modeling (SEDHYD) Conference in Reno, Nevada.

A scene showing the harbor and surrounds at Monaco, Monte Carlo
May 16, 2019

Dr. Christina Kellogg (Research Microbiologist, SPCMSC) is a member of the judging panel that will award winners of the $7 million dollar Shell Ocean Discovery XPRIZE during the final award announcement at the Musée Océanographique de Monaco on May 31.

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map of San Diego county depicting the area studied by the San Diego Hydrogeology project
Date Published: May 16, 2019
Status: Active

San Diego Hydrogeology

This is the first comprehensive geologic and hydrologic study for the San Diego area. This study will provide the integrated hydrogeologic knowledge necessary in this important and highly visible area of the United States and will serve as a role model for similar coastal settings throughout the world that have modest rainfall and small aquifers. Locally, results will help...

Contacts: Wesley Danskin
The backs of two scientists wearing USGS vests and hard hats, looking out at a drone in the sky, standing in a field, with a bur
Date Published: May 6, 2019
Status: Active

Using Drone Imagery to Assess Impacts of the 2018 Carr Fire

USGS WERC’s Dr. Karen Thorne and her research team are using drone imagery to understand how the 2018 Carr Fire affected ecosystems and cultural resources. The study, a collaboration with the National Park Service (NPS), focuses on Whiskeytown National Recreation Area in northern California. The drone images will help the WERC researchers identify changes in topography, cultural sites, debris...

Contacts: Karen Thorne
Map of Hydrogeologic provinces of California and distribution of wells
Date Published: May 2, 2019
Status: Active

Groundwater Ambient Monitoring & Assessment (GAMA)

The Groundwater Ambient Monitoring and Assessment Program’s Priority Basin Project (GAMA-PBP) was established by the California State Water Resources Control Board (SWRCB) in response to the Ground-Water Quality Monitoring Act of 2001 (Sections 10780-10782.3 of the California Water Code). The USGS is the technical lead for the GAMA-PBP and between 2004-2012 focused on characterizing the...

Contacts: Miranda Fram
USGS hydrologists collects a groundwater sample pumped through a hose into a bottle
Date Published: April 26, 2019
Status: Active

Occurrence of natural and anthropogenic hexavalent chromium (Cr VI) in groundwater near a mapped plume, Hinkley, CA

Between 1952 and 1964, cooling water was treated with a compound containing chromium to prevent corrosion within the Pacific Gas and Electric Company (PG&E) Hinkley Compressor Station. This water was discharged to unlined ponds, resulting in contamination of soil and groundwater within the underlying alluvial aquifer. The purpose of this study is to evaluate the occurrence of natural and...

Contacts: John Izbicki
Study Area Map
Date Published: April 26, 2019
Status: Active

Regional Groundwater Availability Study of the California Coastal Basins

This study seeks to quantify water availability in the California Coastal Basins (CCBs). The CCBs vary greatly in their geologic, hydrologic, and climatic conditions; predominant water uses (agricultural, urban, or environmental); and how water availability changes in response to natural and anthropogenic stresses. Considering the complex dynamics of the CCBs and the history of managing water...

Two adjacent poles holding video cameras near top, one control box near bottom, one man holding small tool near control box.
Date Published: April 25, 2019
Status: Active

Using Video Imagery to Study Coastal Change: Santa Cruz Beaches

Two video cameras atop the Dream Inn hotel in Santa Cruz, California, overlook the coast in northern Monterey Bay. Camera 1 looks eastward over Santa Cruz Main Beach and boardwalk, while Camera 2 looks southward over Cowells Beach. The cameras are part of the Remote Sensing Coastal Change project.

Coastal flowers in foreground up on a beach bluff above flat beach with waves gently lapping, sky is cloudy in the distance.
Date Published: April 25, 2019
Status: Active

Using Video Imagery to Study Coastal Change: Sunset State Beach

Two video cameras overlook the coast at Sunset State Beach in Watsonville, California. Camera 1 looks northwest while Camera 2 looks north. The cameras are part of the Remote Sensing Coastal Change project.

A moving illustration shows how waves develop, grow, and move in and around a bay near the ocean following an earthquake.
Date Published: April 19, 2019
Status: Completed

Tsunami Record from the Great 1906 San Francisco Earthquake

Shortly after the Great San Francisco earthquake of April 18, 1906, a sea level disturbance (tsunami) was recorded at the Presidio tide gauge station in San Francisco (the station is now located nearby at Ft. Point). What type of mechanism (earthquake rupture, landslide, other) generated the tsunami...

Contacts: Eric Geist
Application to explore US Oil and Gas Assessments
Date Published: April 19, 2019
Status: Active

United States Assessments of Undiscovered Oil and Gas Resources

USGS Energy Resources Program provides periodic assessments of the oil and natural gas endowment of the United States and the World (click here for information about World Oil and Gas Assessments).  This website provides access to new, prioritized, assessment results and supporting data for the United States, as part...

Tree mortality during California’s extreme drought
Date Published: April 13, 2019
Status: Active

Forest health and drought response

Forests provide society with economically important and often irreplaceable goods and services, such as wood products, carbon sequestration, clean water, biodiversity, and recreational opportunities.  Yet hotter droughts (droughts in which unusually high temperatures exacerbate the effects of low precipitation) are projected to increase in frequency and intensity in coming decades, potentially...

Animation shows map of land and sea, land doesn't change and the ocean and bay change colors according to tidal height.
Date Published: April 3, 2019
Status: Completed

San Francisco Bay Basic Tide Model

This web page provides files that may be used to run a basic depth-averaged (2DH) Deltares Delft3D version 4.00.01 astronomic tide model for San Francisco Bay. It was developed with the primary aim of assessing water level fluctuations and flow conditions in the vicinity of the Golden Gate (Elias and Hansen 2013).

In background, photo shows a view of a beach with hotels and skyscrapers along the shore, text advertisement on top.
Date Published: March 19, 2019
Status: Active

Science Seminar Series

Upcoming public seminars at the Pacific Coastal and Marine Science Center in Santa Cruz, California will be listed here. Also check out a list of our past seminars.

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map of USGS installed wells in San Diego County, CA
May 16, 2019

Summary tables of data for USGS installed wells in San Diego County, CA.  Included are links to data sets, including well construction, geophysical logs, lithologic logs, groundwater levels, water quality, and streamgages.

tablet showing data
April 26, 2019

The annual review by USGS personnel of furnished records is designed to ensure that furnished records are collected in accordance with USGS standards. Furnished records are provided to the USGS by Federal Energy Regulatory Commission (FERC) licensees and other cooperating agencies as a method for reviewing and quality assuring their records so that the data are collected using methods that result

Graphic illustrating location of Land Change Monitoring, Assessment, and Projection sample data
March 28, 2019

USGS LCMAP is the foundation for an integrated land change science framework. This new generation of land change and land cover data are provided to the science community as a suite of products. The products are developed from 30-m Landsat TM, ETM+, and OLI for the years 1985 to 2017. The provisional product suite includes five land cover products and five spectral change products.

Mpa shows areas along the California coast where coastal storm modeling system implementations are completed
March 26, 2019

CoSMoS makes detailed predictions over large geographic scales of storm-induced coastal flooding and erosion for both current and future SLR scenarios, as well as long-term shoreline change and cliff retreat. Several versions of CoSMoS have been implemented for areas of the California coast, including Southern California, Central California, and San Francisco Bay.

NWIS Mapper screenshot
March 5, 2019

The NWIS mapper provides access to over 1.5 million sites contained in the USGS National Water Information System (NWIS), including sites where current and historical surface-water, groundwater, springs, and atmospheric data has been collected. Users can search by site type, data type, site number, or place.

Lidar data of the Gulf Islands, Florida
March 1, 2019

Site provides access to Coastal and Marine Geology Program (CMGP) data via Open Geospatial Consortium (OGC) standards services; serving data to GeoMapApp and Virtual Ocean 2-D and 3-D earth browsing tools, for data integration, visualization and analysis; and metadata catalogs for data discovery.

Map of the Yucaipa Valley area displaying groundwater wells used to monitor water quality and groundwater basin boundaries as de
February 21, 2019

This site provides hydrologic data collected or compiled by the USGS in the Yucaipa area; some additional data may be available from the USGS database National Water Information System (NWIS).

screenshot of interactive data map displaying  USGS wells in the San Antonio Creek groundwater basin
February 13, 2019

In order to understand the integrated hydrologic systems, many different types of data are being gathered from both the surface water and groundwater system. Learn about these data types and explore them with the interactive map.

Map of a coastline with labeled, colored blocks to show where data sets have been collected.
February 7, 2019

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. CoSMoS v3.0 for Southern California shows projections for future climate scenarios (sea-level rise and storms) to provide emergency responders and...

Tubes used for collecting groundwater samples protruding from a nested groundwater well
February 1, 2019

Table of groundwater well sites in the Borrego Valley that were sampled for groundwater quality and groundwater level measurements.  Provides links to data as well as archvied well documents.

Screenshot of the Borrego Valley groundwater quality data map
January 31, 2019

The quality of groundwater in the Borrego Valley is a concern because it is the sole source of water for agricultural, recreational, and public supply. Explore the interactive water-quality data map for detailed information and to download data.

USGS
January 1, 2019

This dataset consists of 65 magnetotelluric (MT) stations collected in 2015 near Mountain Pass, California. The U.S. Geological Survey acquired these data to create a regional conductivity model near the Mountain Pass mine. This work is in support of characterizing mineral deposits.

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maps of the 5 coastal drainage basins in San Diego County
May 16, 2019

Coastal Basins of San Diego County, California, and Northern Baja California, Mexico.  Local features include the San Dieguito River Basin, San Diego River Basin, Sweetwater River Basin, and Otay River Basin.  Maps also display locations of groundwater-monitoring sites. 

Application to explore US Oil and Gas Assessments
March 19, 2019

This map shows the provinces assessed by the USGS for undiscovered oil and gas resources. 

Screenshot of the Borrego Valley groundwater quality data map
January 30, 2019

The quality of groundwater in the Borrego Valley is a concern because it is the sole source of water for agricultural, recreational, and public supply. Explore this interactive water-quality data map for detailed information and to download data.

screenshot of interactive data map displaying  USGS wells in the San Antonio Creek groundwater basin
December 18, 2018

In order to understand the integrated hydrologic systems in the San Antonio Creek Valley, many different types of data are being gathered from both the surface water and groundwater system. Learn about these data types and explore them with the interactive map.

screenshot of interactive map displaying groundwater, water quality, streamgage, and microgravity sites
December 10, 2018

The Lower Colorado Monitoring Network is a series of groundwater-level and water-quality wells, as well as streamgages and micro-gravity sites. This interactive map displays the sites and provides links to the most current data.

Map of California with areas of subsidence shaded by cause
December 7, 2018

In California, land subsidence—mostly from groundwater pumping—was first documented by the USGS in the early 20th century. Completion of State and Federal water projects that bring water from California's wet north to its dry south allowed some groundwater aquifers to recover, and subsidence decreased in these areas. Subsidence continues today, sometimes at high rates of more than 1 foot/year.

screenshot of the user interface
November 13, 2018

This interactive webmap plots water-quality data from domestic and public-supply wells sampled by the USGS for the California Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin Project (GAMA-PBP), and allows users to download datasets. The GAMA-PBP is a cooperative program between the California State Water Resources Control Board and the U.S. Geological Survey. 

screenshot of an interactive map of groundwater data in the Mojave region.  Well sites and water-level contours are displayed.
November 7, 2018

Interactive map of the Mojave and Morongo groundwater basins.  Data layers include sites and data for groundwater levels, water quality, and land subsidence.  Groundwater data spans 1994 to the present.

Map displaying areas in California where the USGS has built groundwater models
August 30, 2018

The USGS models shown on this site are in the public domain, and are freely available. They are based on MODFLOW and other public-domain USGS software. Links to publications and web resources associated with each model are shown in the table next to the model map. The associated model files for some of these models are currently available via download.

Thumbnail image of the cover of USGS Fact Sheet 2016-3020
April 16, 2018

Using information from recent earthquakes, improved mapping of active faults, and a new model for estimating earthquake probabilities, the 2014 Working Group on California Earthquake Probabilities updated the 30-year earthquake forecast for California. They concluded that there is a 72 percent probability (or likelihood) of at least one earthquake of magnitude 6.7 or greater striking somewhere in

 location of and evidence for recent movement on active fault traces within the Hayward Fault Zone, California
April 11, 2018

This map shows the location of and evidence for recent movement on active fault traces within the Hayward Fault Zone, California.

Shake map for At511 Scenario
April 11, 2018

The maps in this archive display estimated intensities and ground motions for the largest earthquakes in the HayWired aftershock sequence. The aftershock sequence follows the HayWired M7.0 mainshock that is imagined to occur on April 18, 2018 along the Hayward Fault.These maps have been used in analyses of the HayWired scenario.

Filter Total Items: 171
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Year Published: 2018

Application of the Stream Salmonid Simulator (S3) to the restoration reach of the Trinity River, California—Parameterization and calibration

Executive SummaryIn this report, we constructed and parameterized the Stream Salmonid Simulator (S3) for the 64-kilometer “Restoration Reach” of the Trinity River, just downstream of Lewiston Dam in northern California. S3 is a deterministic life-stage-structured population model that tracks daily growth, movement, and survival of juvenile salmon...

Perry, Russell W.; Jones, Edward C.; Plumb, John M.; Som, Nicholas A.; Hetrick, Nicholas J.; Hardy, Thomas B.; Polos, Joseph C; Martin, Aaron C.; Alvarez, Justin S.; De Juilio, Kyle P.
Perry, R.W., Jones, E.C., Plumb, J.M., Som, N.A., Hetrick, N.J., Hardy, T.B., Polos, J.C., Martin, A.C., Alvarez, J.S., and De Juilio, K.P., 2018, Application of the Stream Salmonid Simulator (S3) to the restoration reach of the Trinity River, California—Parameterization and calibration: U.S. Geological Survey Open-File Report 2018-1174, 64 p., https://doi.org/10.3133/ofr20181174.

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Year Published: 2018

Emigration and transportation stress of juvenile Chinook salmon relative to their reintroduction upriver of Shasta Dam, California, 2017–18

The Bureau of Reclamation supports the Shasta Dam Fish Passage Evaluation (SDFPE; Yip, 2015) program, and in 2016 set out to determine the feasibility of reintroducing winter-run and spring-run Chinook salmon (Oncorhynchus tshawytscha) and steelhead (O. mykiss) to tributaries upstream of Shasta Dam. Ideally, reintroduction strategy includes...

Adams, Noah S.; Liedtke, Theresa L.; Plumb, John M.; Weiland, Lisa K.; Hansen, Amy C.; Evans, Scott D.
Adams, N.S., Liedtke, T.L., Plumb, J.M., Hansen, A.C., Evans, S.D., and Weiland., L.K., 2018, Emigration and transportation stress of juvenile Chinook salmon relative to their reintroduction upriver of Shasta Dam, California, 2017–18: U.S. Geological Survey Open-File Report 2018-1144, 60 p., https://doi.org/10.3133/ofr20181144.

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Year Published: 2018

Survival, travel time, and utilization of Yolo Bypass, California, by outmigrating acoustic-tagged late-fall Chinook salmon

Juvenile Chinook salmon (Oncorhynchus tshawytscha) migrating through California's Sacramento-San Joaquin River Delta toward the Pacific Ocean face numerous challenges to their survival. The Yolo Bypass is a broad floodplain of the Sacramento River that floods in about 70 percent of years in response to large, uncontrolled runoff events. As one of...

Pope, Adam C.; Perry, Russell W.; Hance, Dalton J.; Hansel, Hal C.
Pope, A.C., Perry, R.W., Hance, D.J., and Hansel, H.C., 2018, Survival, travel time, and utilization of Yolo Bypass, California, by outmigrating acoustic-tagged late-fall Chinook salmon: U.S. Geological Survey Open-File Report 2018-1118, 33 p., https://doi.org/10.3133/ofr20181118.

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Year Published: 2018

Effects of the proposed California WaterFix North Delta Diversion on survival of juvenile Chinook salmon (Oncorhynchus tshawytscha) in the Sacramento-San Joaquin River Delta, northern California

The California Department of Water Resources and Bureau of Reclamation propose new water intake facilities on the Sacramento River in northern California that would convey some of the water for export to areas south of the Sacramento-San Joaquin River Delta (hereinafter referred to as the Delta) through tunnels rather than through the Delta. The...

Perry, Russell W.; Pope, Adam C.
Perry, R.W., and Pope, A.C., 2018, Effects of the proposed California WaterFix North Delta Diversion on survival of juvenile Chinook salmon (Oncorhynchus tshawytscha) in the Sacramento-San Joaquin River Delta, northern California: U.S. Geological Survey Open-File Report 2018-1078, 94 p. plus appendixes, https://doi.org/10.3133/ofr20181078.

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Year Published: 2018

Juvenile Lost River and shortnose sucker year class strength, survival, and growth in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California—2016 Monitoring Report

Executive SummaryThe largest populations of federally endangered Lost River (Deltistes luxatus) and shortnose suckers (Chasmistes brevirostris) exist in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California. Upper Klamath Lake populations are decreasing because adult mortality, which is relatively low, is not being balanced by...

Burdick, Summer M.; Ostberg, Carl O.; Hoy, Marshal S.
Burdick, S.M., Ostberg, C.O., and Hoy, M.S., 2018, Juvenile Lost River and shortnose sucker year class strength, survival, and growth in Upper Klamath Lake, Oregon, and Clear Lake Reservoir, California—2016 Monitoring Report: U.S. Geological Survey Open-File Report 2018–1066, 43 p., https://doi.org/10.3133/ofr20181066.

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Year Published: 2018

Effects of the proposed California WaterFix North Delta Diversion on flow reversals and entrainment of juvenile Chinook salmon (Oncorhynchus tshawytscha) into Georgiana Slough and the Delta Cross Channel, northern California

The California Department of Water Resources and Bureau of Reclamation propose new water intake facilities on the Sacramento River in northern California that would convey some of the water for export to areas south of the Sacramento-San Joaquin River Delta (hereinafter referred to as the Delta) through tunnels rather than through the Delta. The...

Perry, Russell W.; Romine, Jason G.; Pope, Adam C.; Evans, Scott D.
Perry, R.W., Romine, J.G., Pope, A.C., and Evans, S.D., 2018, Effects of the proposed California WaterFix North Delta Diversion on flow reversals and entrainment of juvenile Chinook salmon (Oncorhynchus tshawytscha) into Georgiana Slough and the Delta Cross Channel, northern California: U.S. Geological Survey Open File Report 2018-1028, 46 p., https://doi.org/10.3133/ofr20181028.

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Year Published: 2018

Clayey landslide initiation and acceleration strongly modulated by soil swelling

Largely unknown mechanisms restrain motion of clay-rich, slow-moving landslides that are widespread worldwide and rarely accelerate catastrophically. We studied a clayey, slow-moving landslide typical of thousands in northern California, USA, to decipher hydrologic-mechanical interactions that modulate landslide dynamics. Similar to some other...

Schulz, William; Smith, Joel B.; Wang, Gonghui; Jiang, Yao; Roering, Joshua J.

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Year Published: 2017

A prototype operational earthquake loss model for California based on UCERF3-ETAS – A first look at valuation

We present a prototype operational loss model based on UCERF3-ETAS, which is the third Uniform California Earthquake Rupture Forecast with an Epidemic Type Aftershock Sequence (ETAS) component. As such, UCERF3-ETAS represents the first earthquake forecast to relax fault segmentation assumptions and to include multi-fault ruptures, elastic-rebound...

Field, Edward H.; Porter, Keith; Milner, Kevn
Field, E. H., K. Porter, and K. Milner (2017). A Prototype Operational Earthquake Loss Model for California Based on UCERF3-ETAS – A First Look at Valuation, Earthquake Spectra, Volume 33, No. 4, pages 1–21, DOI: 10.1193/011817EQS017M

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Year Published: 2017

Seismic response of soft deposits due to landslide: The Mission Peak, California, landslide

The seismic response of active and intermittently active landslides is an important issue to resolve to determine if such landslides present an elevated hazard in future earthquakes. To study the response of landslide deposits, seismographs were placed on the Mission Peak landslide in the eastern San Francisco Bay region for a period of one year....

Hartzell, Stephen H.; Leeds, Alena L.; Jibson, Randall W.
Stephen Hartzell, Alena L. Leeds, Randall W. Jibson; Seismic Response of Soft Deposits due to Landslide: The Mission Peak, California, Landslide. Bulletin of the Seismological Society of America ; 107 (5): 2008–2020. doi: https://doi.org/10.1785/0120170033

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Year Published: 2017

Science advancements key to increasing management value of life stage monitoring networks for endangered Sacramento River winter-run Chinook salmon in California

A robust monitoring network that provides quantitative information about the status of imperiled species at key life stages and geographic locations over time is fundamental for sustainable management of fisheries resources. For anadromous species, management actions in one geographic domain can substantially affect abundance of subsequent life...

Johnson, Rachel C.; Windell, Sean; Brandes, Patricia L.; Conrad, J. Louise; Ferguson, John; Goertler, Pascale A. L.; Harvey, Brett N.; Heublein, Joseph; Isreal, Joshua A.; Kratville, Daniel W.; Kirsch, Joseph E.; Perry, Russell W.; Pisciotto, Joseph; Poytress, William R.; Reece, Kevin; Swart, Brycen G.
Johnson, R.C., S. Windell, P.L. Brandes, J. L. Conrad, J. Ferguson, P.A.L. Goertler, B.N. Harvey, J. Houblein, J.A. Isreal, D.W. Kratville, J.E. Kirsch, R.W. Perry, J. Pisciotto, W.R. Poytress, K. Reece, and B.G. Swart. 2017. Science advancements key to increasing management value of life stage monitoring networks for endangered Sacramento River winter-run Chinook salmon in California. San Francisco Estuary and Watershed Science, 15(3): Article 1, 41 p.

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Year Published: 2017

Refining fault slip rates using multiple displaced terrace risers—An example from the Honey Lake fault, NE California, USA

Faulted terrace risers are semi-planar features commonly used to constrain Quaternary slip rates along strike-slip faults. These landforms are difficult to date directly and therefore their ages are commonly bracketed by age estimates of the adjacent upper and lower terrace surfaces. However, substantial differences in the ages of the upper and...

Gold, Ryan D.; Briggs, Richard W.; Crone, Anthony J.; Duross, Christopher
Gold, R.D., Briggs, R.W., Crone, A.J., DuRoss, C.B., 2017. Refining fault slip rates using multiple displaced terrace risers—An example from the Honey Lake fault, NE California, USA. Earth and Planetary Science Letters 477, 134-146.

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Year Published: 2017

Refining fault slip rates using multiple displaced terrace risers—An example from the Honey Lake fault, NE California, USA

Faulted terrace risers are semi-planar features commonly used to constrain Quaternary slip rates along strike-slip faults. These landforms are difficult to date directly and therefore their ages are commonly bracketed by age estimates of the adjacent upper and lower terrace surfaces. However, substantial differences in the ages of the upper and...

Gold, Ryan D.; Briggs, Richard W.; Crone, Anthony J.; Duross, Christopher
Gold, R.D., Briggs, R.W., Crone, A.J., DuRoss, C.B., 2017. Refining fault slip rates using multiple displaced terrace risers—An example from the Honey Lake fault, NE California, USA. Earth and Planetary Science Letters 477, 134-146.

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multicolored map of Ocean Shores, Washington
April 13, 2017

The Pedestrian Evacuation Analyst is an ArcGIS extension that estimates how long it would take for someone to travel on foot out of a hazardous area that was threatened by a sudden event such as a tsunami, flash flood, or volcanic lahar. It takes into account the elevation changes and the different types of landcover that a person would encounter along the way.

schematic one water hydrologic model
November 5, 2014

The One-Water Hydrologic Flow Model (MF-OWHM) (Hanson and others, 2014) is a MODFLOW-based integrated hydrologic flow model (IHM) that is the most complete version, to date, of the MODFLOW family of hydrologic simulators needed for the analysis of a broad range of conjunctive-use issues. 

MODPATH-OBS_distance-direction-observations_USGS-hydrologic-modelling
April 26, 2013

The MODPATH-OBS (Hanson and others, 2013) computer program is designed to calculate simulated equivalents for observations related to advective groundwater transport that can be represented in a quantitative way by using simulated particle-tracking data. 

map of the central valley with the CVHM grid cells overlaid, and a cross section of the subsurface
August 27, 2012

The Central Valley Hydrologic Model (CVHM) is an extensive, detailed three-dimensional (3D) computer model of the hydrologic system of the Central Valley (Faunt, 2009). The Central Valley Hydrologic Model (CVHM) simultaneously accounts for changing water supply and demand across the landscape, and simulates surface water and groundwater flow across the entire Central Valley.

subsurface grid showing relationship surface water and groundwater recharge
June 19, 2008

A Grid-Based, Distributed-Parameter Watershed Model to Estimate Net Infiltration Below the Root Zone

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maps of the 5 coastal drainage basins in San Diego County
May 16, 2019

Coastal Drainage Basins, San Diego County, California

Coastal drainage basins and locations of realtime sites in San Diego County, California.  Local features include the San Dieguito River Basin, San Diego River Basin, Sweetwater River Basin, and Otay River Basin.

map of San Diego county depicting the area studied by the San Diego Hydrogeology project
May 16, 2019

San Diego Hydrogeology | Project Study Area

Location of the study area for the San Diego Hydrogeology project, and location of the major coastal river basins in San Diego County (San Dieguito River, San Diego River, Sweetwater River, Otay River, and Tijuana River).

Burned forest with plants growing between burned trees.
May 11, 2019

Hillside at Whiskeytown National Recreation Area 9 Months After Fire

Vegetation has begun to regrow in Whiskeytown National Recreation Area 9 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

...
Hill with grass and shrubs and trees regrowing after fire.
May 11, 2019

Hill at Whiskeytown National Recreation Area 9 Months After Fire

Vegetation has begun to regrow in Whiskeytown National Recreation Area 9 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

...
Field of growing spring grasses with hill in the background.
May 11, 2019

Landscape at Whiskeytown National Recreation Area 9 Months After Fire

Vegetation has begun to regrow in Whiskeytown National Recreation Area 9 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

...
Roadside landscape with newly grown grass and green trees.
May 11, 2019

Landscape at Whiskeytown National Recreation Area 9 Months After Fire

Vegetation has begun to regrow in Whiskeytown National Recreation Area 9 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

...
April 18, 2019

PubTalk 04/2019 - California's Ecosystems

Title: The Story of California's Changing Ecosystems: As observed from space

  • How can we use images from space to help us understand changes to our coasts, rangelands, forests and wildlife habitats?
  • How can they help to predict future changes?
  • What more can we learn from advances in earth observing technologies?
Adaptive Management Forum
February 28, 2019

Adaptive Management Forum Brochure

Adaptive Management Forum Brochure.This conference was held at the University of California, Davis on February 5-6, 2019.

Juvenile salt marsh harvest mouse
December 31, 2018

Juvenile Salt Marsh Harvest Mouse (Reithrodontomys raviventris)

USGS wildlife biologists holding a juvenile salt marsh harvest mouse (Reithrodontomys raviventris). The species is listed as "endangered" under the Endangered Species Act of 1973.

Web browser screen showing an application with different parameters and controls on left and the resulting map on right.
December 31, 2018

Screenshot of Our Coast, Our Future

Screenshot of Our Coast, Our Future (OCOF) interactive map view of Stinson Beach, California, showing extent of flooding predicted if subjected to a sea-level rise of 100 centimeters (about 40 inches) and elevated water levels caused by a 100-year storm.

Brown landscape with volcano in the background
December 31, 2018

Mount Shasta, a steep-sided Cascade Range stratovolcano in Northern Ca

Mount Shasta, a steep-sided Cascade Range stratovolcano in Northern California, looms above Little Glass Mountain, a thick obsidian flow erupted from the Medicine Lake shield volcano about 1,000 years ago. These are just two of the young volcanic areas monitored by the USGS California Volcano Observatory. USGS photo.

examples of fieldwork done in the Sacramento-San Joaquin River Delta
December 31, 2018

Fieldwork in California’s Sacramento-San Joaquin River Delta

Top row, left to right: Cordell Johnson (left) and Evan Dailey use the USGS R/V Fast Eddy to collect water samples. Cordell Johnson (left) and Jessie Lacy prepare to deploy a tripod holding instruments to measure water level, currents, and suspended sediment. USGS divers Jenny McKee (left) and Tim Elfers assemble the gear they will need to measure vegetation

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SEDHYD Conference Image
May 17, 2019

California Water Science Center (CAWSC) hydrologists Joseph Hevesi, Scott Wright, Alexandra Etheridge, Mathieu Marineau, and Michelle Stern will discuss their research at the 2019 Federal Interagency Sedimentation and Hydrologic Modeling (SEDHYD) Conference in Reno, Nevada.

A scene showing the harbor and surrounds at Monaco, Monte Carlo
May 16, 2019

Dr. Christina Kellogg (Research Microbiologist, SPCMSC) is a member of the judging panel that will award winners of the $7 million dollar Shell Ocean Discovery XPRIZE during the final award announcement at the Musée Océanographique de Monaco on May 31.

A man wearing a baseball cap and badge around his neck is talking to other people about a piece of heavy machinery near him.
April 24, 2019

Schools are welcome to contact USGS about tours in Santa Cruz, California.

A huge canyon surrounded by deep-set cliffs opens to reveal a sunny gorge and part of the Colorado River.
April 11, 2019

A new study shows that mysterious cycles in salinity in the lower Colorado River are a result of precipitation patterns in the headwaters of the upper basin more than a thousand river miles away. The salinity levels generally repeat about every 10 years.

research boat on delta
March 15, 2019

Earlier this month, over 40 scientists from the California Water Science Center attended the 2019 Interagency Ecological Program (IEP) Workshop in Folsom, California. 

Flooding in California
March 13, 2019

New U.S. Geological Survey-led coastal modeling research presents state, federal, and commercial entities with varying storm and sea level-rise scenarios to assist with planning for future infrastructure and mitigation needs along the California coast. 

Application window with parameter settings down the left, map showing results of parameter settings, and legend on right.
March 1, 2019

Oceanographer Juliette Finzi Hart of the USGS Pacific Coastal and Marine Science Center was invited by the California Department of Transportation (Caltrans) to provide an overview of the USGS Coastal Storm Modeling System (CoSMoS) at the 2019 California Transportation Planning Conference in San Diego.

Three illustrations to show location of a study site, each labeled with distinctive areas, where there are high coastal cliffs.
March 1, 2019

On Monday, February 25, 2019, research geologist Jonathan Warrick of the USGS Pacific Coastal and Marine Science Center spoke with ABC7 News about a February 22 landslide that injured one woman and buried another at San Francisco’s Fort Funston beach.

A group of men and women stand and kneel in front of a wall filled with a collection of maps and photos, everyone is smiling.
February 21, 2019

Core players in “Expanding Pacific Research and Exploration of Submerged Systems” (EXPRESS) held a planning workshop at the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California, November 29–30.

Delta Stewardship Council logo
February 14, 2019

Great Lakes Phragmites programs served as a case study for the Delta Stewardship Council

A picture of a river in the neonicotionoid insecticide study
January 14, 2019

This month California Water Science Center Scientist Dr. Michelle Hladik and others published an article on water treatment processes and their effects on neonicotinoid pesticides and the potential health threats they pose.

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