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.

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Filter Total Items: 577
Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 flood-hazard projections: 100-year storm in Orange County

Geographic extent of projected coastal flooding, low-lying vulnerable areas, and maxium/minimum flood potential (flood uncertainty) associated with the sea-level rise 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 erosi

Date published: January 1, 2017

Water pressure/depth, velocity, and turbidity time-series data from SPD15 Bay shallows stations in San Pablo Bay and China Camp Marsh, California

Files contain hydrodynamic and sediment transport data for the location and deployment indicated. Time-series data of water depth, velocity, turbidity, and temperature were collected in San Pablo Bay and China Camp Marsh as part of the San Francisco Bay Marsh Sediment Experiments. Several instruments were deployed in tidal creek, marsh, mudflat, and Bay locations, gathering data on

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 flood-hazard depth and duration projections: 1-year storm in Ventura County

Maximum depth of flooding surface (in cm) in the region landward of the present day shoreline that is inundated for the storm condition and sea-level rise (SLR) scenario indicated. Note: Duration datasets may have occasional gaps in open-coast sections.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of k

Date published: January 1, 2017

Contour--Offshore of Gaviota Map Area, California

This part of DS 781 presents data for bathymetric contours for several seafloor maps of the Offshore of Gaviota Map Area, California. The vector data file is included in "Contours_OffshoreGaviota.zip," which is accessible from https://doi.org/10.5066/F7TH8JWJ. These data accompany the pamphlet and map sheets of Johnson, S.Y., Dartnell, P.,...

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 runup projections

Geographic extent of projected runup associated with the sea-level rise 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. CoSMoS v3.0 for Southern California sh

Date published: January 1, 2017

Water pressure/depth, velocity, and turbidity time-series data from CHC14 Tidal creek stations in San Pablo Bay and China Camp Marsh, California

Files contain hydrodynamic and sediment transport data for the location and deployment indicated. Time-series data of water depth, velocity, turbidity, and temperature were collected in San Pablo Bay and China Camp Marsh as part of the San Francisco Bay Marsh Sediment Experiments. Several instruments were deployed in tidal creek, marsh, mudflat, and Bay locations, gathering data on

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 ocean-currents projections: 100-year storm in Ventura County

Model-derived ocean current velocities (in meters per second) for the given storm condition and sea-level rise (SLR) scenario.
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

Date published: January 1, 2017

1992 pruned digital surface model Malakoff Diggins State Historic Park, California

One of the largest hydraulic mines (1.6 km2) is located in California’s Sierra Nevada within the Humbug Creek watershed and Malakoff Diggins State Historic Park (MDSHP). MDSHP’s denuded and dissected landscape is composed of weathered Eocene auriferous sediments susceptible to chronic rill and gully erosion whereas block failures and debris flows occur in more cohesive ter

Date published: January 1, 2017

Ascii grids of predicted pH in depth zones used by domestic and public drinking water supply depths, Central Valley, California

The ascii grids associated with this data release are predicted distributions of continuous pH at the drinking water depth zones in the groundwater of Central Valley, California. The two prediction grids produced in this work represent predicted pH at the domestic supply and public supply drinking water depths, respectively and are bound by the alluvial boundary that defines the Central Valle...

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 flood-hazard depth and duration projections: 20-year storm in Ventura County

Maximum depth of flooding surface (in cm) in the region landward of the present day shoreline that is inundated for the storm condition and sea-level rise (SLR) scenario indicated. Note: Duration datasets may have occasional gaps in open-coast sections.
The Coastal Storm Modeling System (CoSMoS) makes detailed predictions (meter-scale) over large geographic scales (100s of k

Date published: January 1, 2017

Bathymetric DEM of the Sacramento River, from the Feather River to Knights Landing, California in February 2011

This part of the data release presents a digital elevation model (DEM) created from bathymetry data collected on February 1, 2011, in the Sacramento River from the confluence of the Feather River to Knights Landing. The data were collected by the USGS Pacific Coastal and Marine Science Center (PCMSC) team with collaboration and funding from the U.S. Army Corps of Engineers. This proje

Date published: January 1, 2017

CoSMoS (Coastal Storm Modeling System) Southern California v3.0 Phase 2 ocean-currents projections: average conditions in Orange County

Model-derived ocean current velocities (in meters per second) for the given storm condition and sea-level rise (SLR) scenario.
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

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Hydro-tech in front of graffiti defacing a wall channelizing a stream
May 12, 2017

Graffiti at Sausal Creek

A hydrotech prepares to collect a water-quality sample at urban Sausal Creek, with its distinctive graffiti. Water-quality and ecological surveys were done at the creek as part of the USGS Regional Stream Quality Assessment (RSQA) in the summer of 2016.

Urban creek with concrete banks
May 12, 2017

Concrete channelization of urban creek

Sausal Creek in central Oakland, California, is an urban creek that has been extensively modified for flood control. The USGS Regional Stream Quality Assessment assessed the water quality and ecological integrity of small streams like Sausal Creek in five major regions of the country. Learn more about flow modification of U.S

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Urban creek with concrete banks
May 12, 2017

Concrete channelization of urban creek

Sausal Creek in central Oakland, California, is an urban creek that has been extensively modified for flood control. The USGS Regional Stream Quality Assessment assessed the water quality and ecological integrity of small streams like Sausal Creek in five major regions of the country. Learn more about flow modification of U.S

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Two adjacent poles holding video cameras near top, one control box near bottom, one man holding small tool near control box.
May 12, 2017

Beach-monitoring video cameras atop hotel in Santa Cruz, California

USGS ocean engineer Gerry Hatcher (left) and USGS postdoctoral oceanographer Shawn Harrison make adjustments to a computer controlling two video cameras on the roof of the Dream Inn, a 10-story hotel overlooking Monterey Bay in Santa Cruz, California. One camera looks eastward over Santa Cruz Main Beach and boardwalk, and the other southward over Cowells Beach. Since May

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A man walks knee-deep in stream next to outfall pipe
May 11, 2017

A geomorphologist walks a stream as part of an ecological survey

As part of the Regional Stream Quality Assessments (RSQA), hydrologists, ecologists, and technicians did ecological surveys of aquatic biota and stream habitat.  Here, a geolomorphologist assesses stream banks.

Distant view of the shore from a flat rooftop that is visible at bottom of image.
May 6, 2017

“Snapshot” or first frame of beach video, Santa Cruz, California

Snapshot, or first frame of from a 10-minute video taken May 6, 2017, in Santa Cruz, California. View is from atop a hotel looking down on Cowells Beach, a popular surf spot. Researchers at the USGS are using these and other video images to improve understanding and computer modeling of beach processes, especially those that change the coast. 

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Distant view of the shore from a flat rooftop that is visible at bottom of image.
May 6, 2017

Time-averaged image from video of beach in Santa Cruz, California

Time-averaged image, or “timex,” created by averaging the intensity of light recorded at each spot, or “pixel,” during a 10-minute video taken at Santa Cruz, California, on May 6, 2017. Blurred white zones show where waves are breaking. Line between wet and dry sand shows the maximum height on the beach reached by the waves (“runup”). Researchers at the USGS are using

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Image in mostly black and white tones, showing distant view of beach stretching from bottom left to upper right.
May 6, 2017

Variance image from video of beach in Santa Cruz, California

“Variance” image produced from video shot at Cowells Beach in Santa Cruz, California, on May 6, 2017. The more the light intensity changes at a given spot, or “pixel,” during the video, the brighter the value assigned to that pixel. Motion tends to produce changes in light intensity. Note bright areas along and beyond the shore where waves were breaking. Researchers are

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An extremely rare Mojave River western pond turtle was recently observed in the Mojave Desert.
May 4, 2017

An extremely rare Mojave River western pond turtle

An extremely rare Mojave River western pond turtle was recently observed by USGS scientists and staff from The Living Desert Zoo and Gardens in the Mojave Desert. Turtles of this population have rarely been seen since the late 1990s.

Sacramento National Wildlife Refuge, CA
May 2, 2017

Sacramento National Wildlife Refuge, CA

Sacramento National Wildlife Refuge, CA

A 1000 milliliter glass beaker with 300 milliliters of silty water sits on the metal surface of a hot plate
April 13, 2017

Hot plate set-up

After mixing about 20 grams of a sediment sample with distilled water, we add strong hydrogen peroxide to break down or "digest" organic matter that may be in the sample. Organic matter makes clay particles stick together and we need them separate in order to calculate accurate particle size fractions of the sample. Digestion takes place overnight. Then we cook off the

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View from a boat of a man snorkeling in a marshy waterway with thick vegetation along the edge of and in the water.
April 5, 2017

Brazilian waterweed

Tips of Brazilian waterweed (Egeria densa) break the surface at low tide in Lindsey Slough in the northern Sacramento-San Joaquin River Delta. More commonly, this invasive plant is completely submerged.

Filter Total Items: 980
USGS science for a changing world logo
September 23, 2011

Scientists were unable to complete this year’s survey of the California sea otter (also known as the southern sea otter) population due to heavy fog, poor visibility, and strong winds throughout the spring and summer. 

USGS science for a changing world logo
September 20, 2011

Groundwater is among United States' most important natural resources. This hidden resource provides half of our drinking water, enables sustained economic growth to agriculture other industries, and contributes to the health of ecosystems throughout the country. 

USGS science for a changing world logo
August 23, 2011

Scientists around the world are exploring many different methods, including repeat photography, to better understand today's changing environmental conditions. Thursday's lecture,"Through the Lens of Time," explains the techniques in repeat, or “time-lapse,” photography being used to monitor landscapes by tracking and studying changing climates and environmental conditions.

USGS science for a changing world logo
August 22, 2011

A report cooperatively produced and published by the U.S. Geological Survey and the California Geological Survey contains a map and associated datasets that inventory 290 locations of reported natural asbestos occurrences in California.

Image: Coso Volcanic Field Tumulus
August 16, 2011

A new design for the USGS Volcano Science Center (VSC) web pages is now open for internal viewing. This site has not been fully developed yet, and there are still many holes to fill. The launch is meant to give VSC staff a preview into the new database-driven website design.

USGS science for a changing world logo
August 15, 2011

On Aug. 16, the USGS will debut a new film, “Lake of the Sky: USGS Tahoe Basin Science,” on scientific research in the Lake Tahoe Basin at the 15th Annual Lake Tahoe Summit "Stewardship and Sustainability in Challenging Fiscal Times" sponsored by Senator Diane Feinstein, at Homewood Mountain Ski Resort in California. 

USGS science for a changing world logo
August 15, 2011

A new and comprehensive geologic map of Lassen Volcanic National Park allows land managers, first responders and engineers to better assess volcanic hazards in the park and its vicinity, and provides a framework for all future earth science research in the area.

USGS science for a changing world logo
August 12, 2011

The public is invited to the Loomis Museum in Lassen Volcanic National Park on Wednesday, August 17 from 10:30 a.m. to 11:30 a.m. for the unveiling of a spectacular new map and booklet that interprets the detailed geology of the park. The U.S. Geological Survey and the Park are pleased to announce a special public presentation by USGS scientists to unveil their new landmark publication, the "

Screenshot Location of Lassen Volcanic Center
August 12, 2011

The U.S. Geological Survey and Lassen Volcanic National Park are pleased to announce a special public presentation by USGS scientists to unveil, the "Geologic Map of Lassen Volcanic National Park and Vicinity," a map and booklet that interprets the detailed geology of the park.

USGS science for a changing world logo
August 11, 2011

Science papers, posters, and other types of information used to inform and update Klamath Basin public and private sector stakeholders at the 2010 Klamath Basic Science Conference have been published by the USGS in an Open File Report that is now available online.

USGS science for a changing world logo
August 9, 2011

This July, researchers from the U.S. Geological Survey and National Park Service discovered that California Common Murre (Uria aalge californica) chicks had hatched on the Channel Islands for the first time since 1912.

USGS science for a changing world logo
August 1, 2011

Marine biologists are setting up camp in Forks this week, and sea otters will be their quarry on a three-week expedition. Researchers from the U.S. Geological Survey, Seattle Aquarium, Monterey Bay Aquarium and other institutions are studying the health of local sea otters to assess the condition of Washington’s nearshore ecosystem.