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: 393
Date published: July 26, 2019
Status: Active

CoSMoS 2.0: North-central California (outer coast)

Our Coast Our Future (OCOF) is a collaborative, user-driven project providing science-based decision-support tools to help coastal planners and emergency responders understand, visualize, and anticipate local impacts from sea-level rise (SLR) and storms in the San Francisco Bay region.

Date published: July 18, 2019
Status: Active

Western Basin & Range - Eastern California Shear Zone

 

The Eastern California Shear Zone (ECSZ) Mapping project, funded by the National Cooperative Geologic Mapping Program, combines surficial and bedrock geologic mapping, geophysical surveys, and high-resolution topographic data analysis with neotectonic, geomorphic, structural, volcanic, and geochronologic studies to better understand the tectonic framework and landscape...

Contacts: Andrew Cyr
Date published: July 11, 2019
Status: Completed

Comparing Shaking Intensity from Two Bay Area Earthquakes

The 1989 Loma Prieta earthquake caused billions of dollars in damage and claimed more than sixty lives. But was it "the big one"? Take a look at the comparison between the images below for the 1989 Loma Prieta and the 1906 San Francisco earthquakes, and decide for yourself.

The colors on the map indicate Modified Mercalli Shaking Intensity (MMI) at each point, which is usually (but not...

Date published: June 28, 2019
Status: Completed

Paleoseismology and the Hayward Fault

A large, widely damaging earthquake will occur on the Hayward fault in the future. That much we know.
What we don't know is when.

Date published: June 26, 2019
Status: Active

Information by Region- California

  

Date published: June 20, 2019
Status: Active

Aerial Seabird and Marine Mammal Surveys

The Seabird Studies Team at the USGS Western Ecological Research Center is conducting aerial photographic surveys of the ocean off central and southern California to create comprehensive maps of seabird and marine mammal distributions. The project is supported by the Bureau of Ocean Energy Management and will inform planning in advance of potential offshore wind energy development along the...

Date published: June 17, 2019
Status: Active

The Coastal Storm Modeling System

The Coastal Storm Modeling System (CoSMoS) provides emergency responders and coastal planners with critical storm-hazard information such as flood extent, flood depth, duration of flooding, wave height, and currents that can be used to increase public safety, mitigate physical damages, and more effectively manage complex coastal settings....

Date published: June 17, 2019
Status: Active

Ecosystem Restoration in San Francisco Bay and Delta

In many systems, particularly the relatively dry western United States, freshwater that historically flowed into estuaries has been diverted for drinking water, agriculture, and industry. The resulting changes to water flow profoundly altered estuarine ecosystems. CMHRP studies in this complex system...

Date published: June 17, 2019
Status: Active

Salton Seismic Imaging

Studying Earthquake Hazards and Rifting Processes in the Imperial and Coachella Valleys

Date published: June 17, 2019
Status: Active

San Francisco Bay Area Arrays and the East Bay Seismic Experiment

Portable Seismograph Deployments to Research the Effects of Basins, Topography, and Fault Zones on Seismic Waves.

The implosion of the Warren Hall building on California State University East Bay (CSU-EB) campus in August of 2013 provided an excellent opportunity to use a “free” seismic source that was practically located on the Hayward Fault.

Date published: June 13, 2019
Status: Active

Improving Forecasting for California's Snow Melt Water Supply

California's Sierra Nevada snowpack accounts for much of the water supply in many parts of the state. The snowpack retains large amounts of water in the winter that is then released as temperatures rise in the spring and summer. The snowpack also keeps the Sierra soil moist by covering it longer into spring and summer. Soil moisture influences the onset of wildfires, as well as wildfire...

Date published: June 12, 2019
Status: Completed

Basin Characterization Model - Simulating Effects of Iowa Soil Management on Water Availability

As a result of climate change, heavy rainfall, as well as extended dry periods, are becoming more common in the Midwestern United States. These trends are only expected to continue. So, increasing the capacity of soil to store water has become more critical. Storing water increases availability in dry conditions. And the absorption of additional water in wet conditions reduces potential...

Filter Total Items: 519
Date published: April 23, 2020

2018 San Gabriel Reach Habitat Data

This dataset includes reach habitat data for the Santa Ana Sucker (Catostomus santaanae) and the Arroyo Chub (Gila orcutti) in the San Gabriel River.

Date published: April 16, 2020

Blank results for trace-element data collected for the California Groundwater Ambient Monitoring and Assessment (GAMA) Program Priority Basin Project, October 2009–October 2018

Groundwater samples have been collected in California as part of statewide investigations of groundwater quality conducted by the U.S. Geological Survey for the Groundwater Ambient Monitoring and Assessment (GAMA) Priority Basin Project (PBP). Quality-control samples are routinely collected as part of the GAMA-PBP quality assurance plan. Olsen and others (2010) and Davis and others %2

Date published: March 31, 2020

Minisparker and chirp seismic-reflection data of field activity 2014-645-FA; offshore Santa Barbara, southern California from 2014-11-12 to 2014-11-25

USGS collected high-resolution multichannel minisparker and single-channel chirp seismic-reflection data in November 2014, in the offshore Catalina and Santa Cruz basins, which are surrounded by several of the southern California Channel Islands. The survey was designed to image areas of the seafloor associated with movement on the numerous faults offshore of southern California.

Date published: March 31, 2020

2016 Zooplankton sampling in San Joaquin River and False River near Jersey Island in the Sacramento-San Joaquin River Delta of Contra Costa County, California, USA (ver. 2.0, April 2020)

This data set contains information on zooplankton and associated environmental parameters for sampling conducted in the San Joaquin River and False River near their confluence at Jersey Point (Contra Costa County, California), during February-March, 2016. Macrozooplankton were sampled with vertical tows (bottom to surface) of a 50 cm-diameter conical plankton net that was 150cm lon

Date published: March 30, 2020

Historical produced water chemistry data compiled for selected oil fields in Los Angeles and Orange Counties, southern California

This digital dataset contains historical geochemical and other information for 200 samples of produced water from 182 sites in 25 oil fields in Los Angeles and Orange Counties, southern California. Produced water is a term used in the oil industry to describe water that is produced as a byproduct along with the oil and gas. The locations from which these historical samples have been collected...

Date published: March 27, 2020

Multichannel minisparker and chirp seismic reflection data of USGS field activity 2016-616-FA collected in the Catalina Basin offshore southern California in February 2016

This data release contains 25 multichannel minisparker seismic reflection (MCS) profiles and 41 chirp sub-bottom profiles collected in February of 2016 from the Catalina Basin offshore southern California by PCMSC  in cooperation with the University of Washington. We collected data on R/V Thompson on USGS cruise 2016-616-FA. We collected MCS profiles to image the fault and channel...

Date published: March 27, 2020

Multichannel minisparker seismic-reflection data of USGS field activity 2016-616-FA collected in the Catalina Basin offshore southern California in February 2016

This data release contains 25 multichannel minisparker seismic reflection (MCS) profiles that were collected in February of 2016 from the Catalina Basin offshore southern California by the U.S. Geological Survey Pacific and Coastal Marine Science Center in cooperation with the University of Washington. Data were collected aboard the University of Washington’s R/V Thomas G. Thompson

Date published: March 27, 2020

Chirp seismic-reflection data of USGS field activity 2016-616-FA collected in the Catalina Basin offshore southern California in February 2016

This data release contains 41 chirp sub-bottom profiles that were collected in February of 2016 from the Catalina Basin offshore southern California by the U.S. Geological Survey Pacific and Coastal Marine Science Center in cooperation with the University of Washington. Data were collected aboard the University of Washington’s R/V Thomas G. Thompson on USGS cruise 2016-616-FA. Chirp pro

Date published: March 25, 2020

Public-Supply Well Water Quality Results: Inorganic Data and Trends, 1974 - 2014 (California GAMA-PBP)

The GAMA-PBP Public-Supply Well Results data viewer allows the user to visualize and download California water-quality data and trends for1974 - 2014. Groundwater-quality data for 38 inorganic constituents are captured and can be downloaded for individual sites or by grid cell. 

Date published: March 25, 2020

Electrical Resistivity Tomography in the Anza-Terwilliger Valley, Riverside County, California 2018

The Cahuilla Valley and Terwilliger Valley groundwater basins, 9-006 and 7-026 respectively (California Department of Water Resources 2016) located approximately 25 miles southwest of Palm Springs, are the sole-source for groundwater supply for the rural disadvantaged community and two Native American Tribes, the Ramona Band of Cahuilla and the Cahuilla. The characteristics and sustaina

Date published: March 25, 2020

Electrical Resistivity Tomography GIS Data near Anza, Riverside County, California, 2018

The Cahuilla Valley and Terwilliger Valley groundwater basins, 9-006 and 7-026 respectively (California Department of Water Resources 2016) located approximately 25 miles southwest of Palm Springs, are the sole-source for groundwater supply for the rural disadvantaged community and two Native American Tribes, the Ramona Band of Cahuilla and the Cahuilla. The characteristics and sustaina

Date published: March 19, 2020

Groundwater quality data from Bristol and Cadiz Basins, San Bernardino County, California, USA

Water chemistry data from wells sampled by Standard Lithium Ltd. in Bristol and Cadiz Basins in San Bernardino County, California, USA

Filter Total Items: 355
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Year Published: 2017

The transtensional offshore portion of the northern San Andreas fault: Fault zone geometry, late Pleistocene to Holocene sediment deposition, shallow deformation patterns, and asymmetric basin growth

We mapped an ~120 km offshore portion of the northern San Andreas fault (SAF) between Point Arena and Point Delgada using closely spaced seismic reflection profiles (1605 km), high-resolution multibeam bathymetry (~1600 km2), and marine magnetic data. This new data set documents SAF location and continuity, associated tectonic...

Beeson, Jeffrey W.; Johnson, Samuel Y.; Goldfinger, Chris
Beeson, J.W., Johnson, S.Y., and Goldfinger, C., 2017, The transtensional offshore portion of the northern San Andreas fault: Fault zone geometry, late Pleistocene to Holocene sediment deposition, shallow deformation patterns, and asymmetric basin growth: Geosphere, v. 13, n. 4, 34 p.,

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Year Published: 2017

Investigation of late Pleistocene and Holocene activity in the San Gregorio fault zone on the continental slope north of Monterey Canyon, offshore central California

We provide an extensive high‐resolution geophysical, sediment core, and radiocarbon dataset to address late Pleistocene and Holocene fault activity of the San Gregorio fault zone (SGFZ), offshore central California. The SGFZ occurs primarily offshore in the San Andreas fault system and has been accommodating dextral strike‐slip motion between the...

Maier, Katherine L.; Paull, Charles K.; Brothers, Daniel; Caress, David W.; McGann, Mary; Lundsten, Eve M.; Anderson, Krystle; Gwiazda, Roberto
Maier, K.L., Paull, C.K., Brothers, D.S., Caress, D.W., McGann, Mary, Lundsten, E.M., Anderson, Krystle, and Gwiazda, Roberto, 2017, Investigation of Late Pleistocene and Holocene Activity in the San Gregorio Fault Zone on the Continental Slope North of Monterey Canyon, Offshore Central California: Bulletin of the Seismological Society of America, v. 107, p. 1094-1106, doi: 10.1785/0120160261.

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Year Published: 2017

A spatiotemporal clustering model for the Third Uniform California Earthquake Rupture Forecast (UCERF3‐ETAS): Toward an operational earthquake forecast

We, the ongoing Working Group on California Earthquake Probabilities, present a spatiotemporal clustering model for the Third Uniform California Earthquake Rupture Forecast (UCERF3), with the goal being to represent aftershocks, induced seismicity, and otherwise triggered events as a potential basis for operational earthquake forecasting (OEF)....

Field, Edward H.; Milner, Kevin R.; Hardebeck, Jeanne L.; Page, Morgan T.; van der Elst, Nicholas; Jordan, Thomas H.; Michael, Andrew J.; Shaw, Bruce E.; Werner, Maximillan J.

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Year Published: 2017

Trace element contamination in feather and tissue samples from Anna’s hummingbirds

Trace element contamination (17 elements; Be, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Mo, Cd, Ba, Hg, Tl, and Pb) of live (feather samples only) and deceased (feather and tissue samples) Anna's hummingbirds (Calypte anna) was evaluated. Samples were analyzed using inductively coupled plasma-mass spectrometry (ICP-MS; 17 elements) and atomic...

Mikoni, Nicole A.; Poppenga, Robert H.; Ackerman, Joshua T.; Foley, Janet E.; Hazlehurst, Jenny; Purdin, Güthrum; Aston, Linda; Hargrave, Sabine; Jelks, Karen; Tell, Lisa A.
Mikoni, NA, R Poppenga, JT Ackerman, J Foley, J Hazlehurst, G Purdin, L Aston, S Hargrave, K Jelks, LA Tell. 2017. Trace element contamination in feather and tissue samples from Anna’s hummingbirds. Ecological Indicators 80: 96-105. doi: 10.1016/j.ecolind.2017.04.053

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Year Published: 2017

A paleoseismic transect across the northwestern Basin and Range Province, northwestern Nevada and northeastern California, USA

We use new and existing data to compile a record of ∼18 latest Quaternary large-magnitude surface-rupturing earthquakes on 7 fault zones in the northwestern Basin and Range Province of northwestern Nevada and northeastern California. The most recent earthquake on all faults postdates the ca. 18–15 ka last glacial highstand of pluvial Lake Lahontan...

Personius, Stephen; Briggs, Richard W.; Maharrey, J. Zebulon; Angster, Stephen J.; Mahan, Shannon A.
Personius, Stephen F., Briggs, Richard W., Maharrey, J. Zebulon, Angster, Stephen J., and Mahan, Shannon A., 2017, A Paleoseismic transect across the northwestern Basin and Range Province, northwestern Nevada and northeastern California, USA: Geosphere, v. 13, no. 3, p. 782–810, doi:10.1130/GES01380.1.

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Year Published: 2017

Effect of hydraulic hysteresis on the stability of infinite slopes under steady infiltration

Hydraulic hysteresis, including capillary soil water retention (SWR), air entrapment SWR, and hydraulic conductivity, is a common phenomenon in unsaturated soils. However, the influence of hydraulic hysteresis on suction stress, and subsequently slope stability, is generally ignored. This paper examines the influence of each of these three types...

Chen, Pan; Mirus, Benjamin B.; Lu, Ning; Godt, Jonathan W.
Chen, P, BB Mirus. N Lu, JW Godt, 2017. Effect of hydraulic hysteresis on the stability of infinite slopes under steady infiltration. Journal of Geotechnical and Geoenvironmental Engineering, DOI: 10.1061/(ASCE)GT.1943-5606.0001724.

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Year Published: 2017

The California Seafloor and Coastal Mapping Program – Providing science and geospatial data for California's State Waters

The California Seafloor and Coastal Mapping Program (CSCMP) is a collaborative effort to develop comprehensive bathymetric, geologic, and habitat maps and data for California's State Waters. CSCMP began in 2007 when the California Ocean Protection Council (OPC) and the National Oceanic and Atmospheric Administration (NOAA) allocated funding for...

Johnson, Samuel Y.; Cochrane, Guy R.; Golden, Nadine; Dartnell, Peter; Hartwell, Stephen; Cochran, Susan A.; Watt, Janet
Johnson, S.Y., Cochrane, G.R., Golden, N.E., Dartnell, P., Hartwell, S.R., Cochran, S.A., and Watt, J.T., 2017, The California Seafloor Mapping Program - Providing science and geospatial data for California’s State Waters: Ocean and Coastal Management, v. 140, p. 88-104. http://dx.doi.org/10.1016/j.ocecoaman.2017.02.004.

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Year Published: 2017

Accelerating slip rates on the puente hills blind thrust fault system beneath metropolitan Los Angeles, California, USA

Slip rates represent the average displacement across a fault over time and are essential to estimating earthquake recurrence for proba-bilistic seismic hazard assessments. We demonstrate that the slip rate on the western segment of the Puente Hills blind thrust fault system, which is beneath downtown Los Angeles, California (USA), has accel-erated...

Bergen, Kristian J.; Shaw, John H.; Leon, Lorraine A.; Dolan, James F.; Pratt, Thomas L.; Ponti, Daniel J.; Morrow, Eric; Barrera, Wendy; Rhodes, Edward J.; Murari, Madhav K.; Owen, Lewis A.
Bergen, K.J., Shaw, J.H., Leon, L.A., Dolan, J.F., Pratt, T.L., Ponti, D.J., Morrow, E., Barrera, W., Rhodes, E.J., Murari, M.K., and Owen, L.A., 2017, Accelerating slip rates on the Puente Hills blind thrust fault system beneath metropolitan Los Angeles, California, USA, Geology, G38520.1, 4 pp. doi:10.1130/G38520.1

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Year Published: 2017

Adapting California’s ecosystems to a changing climate

Significant efforts are underway to translate improved understanding of how climate change is altering ecosystems into practical actions for sustaining ecosystem functions and benefits. We explore this transition in California, where adaptation and mitigation are advancing relatively rapidly, through four case studies that span large spatial...

Elizabeth Chornesky; David Ackerly; Paul Beier; Davis, Frank W.; Flint, Lorraine E.; Lawler, Joshua J.; Moyle, Peter B.; Moritz, Max A.; Scoonover, Mary ; Byrd, Kristin B.; Alvarez, Pelayo; Heller, Nicole E.; Micheli, Elisabeth; Weiss, Stuart
Chornesky, E.A., Ackerly, D.D., Beier, P., Davis, F.W., Flint, L.E., Lawler, J.J., Moyle, P.B., Moritz, M.A., Scoonover, M., Byrd, K., Alvarez, P., Heller, N.E., Micheli, E.R., and Weiss, S.B., 2015, Adapting California’s ecosystems to a changing climate: BioScience, v. 65, no. 3, p. 247-262. doi:10.1093/biosci/biu233 [First published 26 February 2015]

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Year Published: 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 storm-hazard projections

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 SLR scenarios, as well as long-term shoreline change and cliff retreat.  Resulting projections for future climate scenarios (...

Barnard, Patrick; Erikson, Li; O'Neill, Andrea; Foxgrover, Amy; Herdman, Liv
Patrick Barnard, Li Erikson, Amy Foxgrover, Andrea O'Neill, and Liv Herdman, 2016, CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 storm-hazard projections: U.S. Geological Survey Data Release, doi:10.5066/F7T151Q4

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Year Published: 2017

Ground motion in the presence of complex Topography II: Earthquake sources and 3D simulations

Eight seismic stations were placed in a linear array with a topographic relief of 222 m over Mission Peak in the east San Francisco Bay region for a period of one year to study topographic effects. Seventy‐two well‐recorded local earthquakes are used to calculate spectral amplitude ratios relative to a reference site. A well‐defined...

Hartzell, Stephen H.; Ramirez-Guzman, Leonardo; Meremonte, Mark; Leeds, Alena L.
Ground Motion in the Presence of Complex Topography II: Earthquake Sources and 3D Simulations Hartzell,Stephen, Ramírez-Guzmán L., Meremonte M., Leeds A. Bulletin of the Seismological Society of America(2017),107(1):344

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Year Published: 2016

Records of continental slope sediment flow morphodynamic responses to gradient and active faulting from integrated AUV and ROV data, offshore Palos Verdes, southern California Borderland

Variations in seabed gradient are widely acknowledged to influence deep-water deposition, but are often difficult to measure in sufficient detail from both modern and ancient examples. On the continental slope offshore Los Angeles, California, autonomous underwater vehicle, remotely operated vehicle, and shipboard methods were used to collect a...

Maier, Katherine L.; Brothers, Daniel; Paull, Charles K.; McGann, Mary; Caress, David W.; Conrad, James E.
Maier, K.L., Brother, D.S., Paull, C.K., McGann, Mary, Caress, D.W., Conrad, J.E., available online 2016, Records of continental slope sediment flow morphodynamic responses to gradient and active faulting from integrated AUV and ROV data, offshore Palos Verdes, southern California Borderland: Marine Geology, https://doi.org/10.1016/j.margeo.2016.10.001

Filter Total Items: 1,005
man in the background of a view between clear tubing
September 11, 2019

High-resolution Water Quality Mapping on California's Bay-Delta

Hydrologist Brian Bergamaschi is seen through the USGS California Water Science Center Biogeochemistry Group's underwater water quality mapping manifold. This maze of tygon tubing allows water to be pumped onto a boat while underway, splits the water into multiple flowpaths, and passes the water to various flow-through water quality instruments through a manifold that

...
person with yellow top and red hardhat
September 11, 2019

Scott Lydeen at Strawberry Peak Seismic Station Tower

USGS technicial Scott Lydeen climbing the tower at the Strawberry Peak seismic station tower, part of the Southern California Seismic Network.

Quratulain Ahmed preserving samples in fume hood
September 9, 2019

Quratulain Ahmed preserving samples in fume hood

Quratulain Ahmed preserving samples in fume hood

Sydney Berrios running samples on Aqualog
September 8, 2019

Sydney Berrios running samples on Aqualog

Sydney Berrios running samples on Aqualog

Horiba Aqaulog - simultaneously measures absorbance spectra and fluorescence Excitation-Emission Matrices
September 6, 2019

Horiba Aqaulog

Horiba Aqaulog - simultaneously measures absorbance spectra and fluorescence

TOC-L Laboratory Total Organic Carbon Analyzer
September 5, 2019

TOC-L Laboratory Total Organic Carbon Analyzer

TOC-L Laboratory Total Organic Carbon Analyzer

Labconco WaterPros PS ultrapure water filtration system in Biology Lab
September 3, 2019

Labconco WaterPros PS ultrapure water filtration system in Biology Lab

Labconco WaterPros PS ultrapure water filtration system in Biology Lab

Fume Hood in Carbon Lab used for acid storage and acid cleaning of laboratory dishware
September 1, 2019

Fume Hood in Carbon Lab used for acid storage and acid cleaning of lab

Fume Hood in Carbon Lab used for acid storage and acid cleaning of laboratory dishware

Fume Hood in Carbon Lab
August 31, 2019

Fume Hood in Carbon Lab

Horiba Aqaulog - simultaneously measures absorbance spectra and fluorescence Excitation-Emission Matrices

Filter Total Items: 938
A man walks across low sand dunes wearing a backpack and carrying a hand-held computer, near water, smoke stacks in distance.
November 1, 2018

From October 9–15, USGS personnel surveyed beaches and the adjacent ocean floor along Monterey Bay’s northern coast.

People stand around a table with posters laid on top, listening thoughtfully to a man who is talking.
November 1, 2018

On October 17, 2018, 17 staff members from the City of Santa Cruz, California toured USGS facilities in the city.

city skyline at night with tall buildings and bridge in left foreground lit up
October 17, 2018

By Thomas M. Brocher, Jack Boatwright, James J. Lienkaemper, Carol S. Prentice, David P. Schwartz, and Howard Bundock

Drawn from: USGS Fact Sheet 2018-3052

Men stand on a boat wearing safety gear and they are recovering damaged instrumentation from the water using cables and ropes.
October 5, 2018

Large underwater experiment in California’s Monterey Canyon shows that “turbidity currents” are not just currents, but involve movement of the seafloor itself.

Three men stand together, man at left is pointing to a map and talking, man in middle looks on, man at right takes notes.
September 21, 2018

On September 18, Congressman Jimmy Panetta (20th district, California) and staffer Emmanuel Garcia visited the USGS Pacific Coastal and Marine Science Center in Santa Cruz.

adult male harrier
September 13, 2018

Did you know that the USGS is studying raptors in California? Biologists with the USGS Western Ecological Research Center are hard at work in the field, learning more about the ecology of Northern Harriers and their interactions with migratory waterfowl of concern to the U.S. Fish and Wildlife Service.

View from the top deck of a ship on water, looking down on the bow with three people standing, with a bridge in the background.
September 7, 2018

From July 31 to August 23, a joint USGS-NOAA cruise mapped seafloor depths, texture, and gas seeps in the Cascadia subduction zone offshore of Washington, Oregon, and northern California.

Two women stand on a stage near a wall illuminated with the jet propulsion lab's banner, and at the far end are three flags.
September 7, 2018

USGS and NASA researchers met July 16 at NASA’s Jet Propulsion Laboratory (JPL) to discuss Synthetic Aperture Radar (SAR) imagery of the Southern California coast collected during higher-than-normal tides (“king tides”) in fall 2016.

View from a boat of a man snorkeling in a marshy waterway with thick vegetation along the edge of and in the water.
August 31, 2018

In recent years, invasive aquatic plants have increased exponentially in the shallow waters of California’s Sacramento-San Joaquin River Delta, clogging about 17,400 acres (nearly 30 square miles) of the waterways. Among the plants’ many effects are changes in the way mud and sand move through the region.

toad on the road
August 28, 2018

Many amphibians are either too small or too slow to avoid an oncoming car. For some populations of the Federally threatened Yosemite toad (Anaxyrus canorus), this has meant increased mortality from vehicle strikes in addition to other threats from disease, drought, and habitat loss.

California rangelands
August 27, 2018

Governor Edmund G. Brown Jr. today announced the release of new science and planning tools to support California’s continued leadership on actions to address climate change and safeguard the state’s people, economy and resources.

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