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 16, 2018
Status: Completed

Water-Quality Inventory Pesticides in the Golden Gate National Recreation Area

In 1998, all urban creeks in the San Francisco Bay Area were added to the Clean Water Act Section 303d list due to known or suspected diazinon impairment. Diazinon is an organophosphorus insecticide used on lawns, and fruit and vegetables. This pesticide has since been "phased out" and has not been available for purchase since late 2004. Diazinon use is declining and is being replaced by other...

Date published: November 15, 2018
Status: Active

Variability of Salinity and Temperature In San Francisco Bay

The USGS has been collecting specific conductance (salinity) and water temperature data in San Francisco Bay (SF Bay) since 1990. Data are typically collected at 5-10 fixed locations throughout the bay, every fifteen minutes, every minute of the day.

Date published: November 15, 2018
Status: Completed

High-Speed Mapping of Nutrient Distributions and Water Quality Survey - Lower South San Francisco Bay

This project aims to characterize spatial heterogeneity for key water quality parameters, and pilot the use of underway-flowthrough mapping of biogeochemical properties as a cost-effective approach to monitoring. 

Date published: November 15, 2018
Status: Active

Delta Regional Monitoring Program: Current-use Pesticides

This study will utilize the unique analytical capabilities of the USGS Pesticide Fate Research Group (PFRG), Organic Chemistry Research Laboratory (OCRL) to assess the occurrence of a large suite of understudied, current-use pesticides and pesticide degradates in surface waters entering the Sacramento/San Joaquin Delta. 

Contacts: James Orlando
Date published: November 15, 2018
Status: Active

San Francisco Bay Area - East Bay (BALT1) Site near Castro Valley, CA

Landslides in the San Francisco Bay area (SFBA) of California impact people, infrastructure, and the environment, and are commonly induced by intense or prolonged rainfall associated with strong winter storms...

Contacts: Brian Collins
Date published: November 15, 2018
Status: Completed

Assessment of Baseline Conditions in Liberty Cut

Monitoring habitat quality in the San Francisco Estuary (SFE) and Sacramento-San Joaquin Delta has been limited to mostly monthly discrete measurements of biologically relevant parameters (e.g. phytoplankton, dissolved organic matter (DOM), nutrients) that cannot fully characterize the physical and biogeochemical variability.

Contacts: Bryan Downing
Date published: November 15, 2018
Status: Completed

Optimal Groundwater Sustainability, Santa Barbara, California

Prior to 1997, local surface water and groundwater supplied all of the water supply for the city of Santa Barbara (about 120 miles northwest of Los Angeles). Excess pumping of groundwater during times of drought resulted in saltwater intrusion in Storage Unit I of the Santa Barbara groundwater basin. 

Contacts: Tracy Nishikawa
Date published: November 15, 2018
Status: Active

Evaluating coagulation techniques to reduce the transport of Hg from mine-affected and active geothermal Hg-source watersheds

Our objective is to determine the effectiveness of coagulation and adsorption techniques in removing mercury from contaminated surface waters of the Cache Creek watershed.

Contacts: Jacob A Fleck
Date published: November 15, 2018
Status: Active

Dynamics of zooplankton in the Cache Slough Complex

Our purpose is to investigate what controls the distribution and abundance of fish prey within the Cache Slough Complex (CSC).

Date published: November 14, 2018
Status: Active

Assessment of methyl mercury (MeHg) release from sediment formed in wetland treatment cells designed to remove mercury from surface waters using in situ coagulation

Our objective is to determine the relative propensity of sediment material formed under two different in situ coagulation treatments (iron sulfate, polyaluminum chloride) to release MeHg into surface waters under environmentally relevant conditions that may affect flocculant stability and MeHg production rates.

Contacts: Jacob A Fleck
Date published: November 14, 2018
Status: Completed

Phytoplankton production and nutrient transformations in shallow water wetland habitats

The objectives of this study are to quantify and characterize (1) phytoplankton production on Liberty Island, (2) utilization and transformation of nutrients, and (3) attenuation/loss of phytoplankton as the material is transported from Liberty Iisland into Cache Slough.

Date published: November 13, 2018
Status: Completed

Santa Rosa Plain

The Santa Rosa Plain, home to approximately half of the population of Sonoma County, faces growth in population and demand for water. Water supply is provided by a combination of ground water and water delivered via aqueduct from the Russian River.

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

Folds—Point Sur to Point Arguello, California

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

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 ocean-currents projections: 100-year storm in San Luis Obispo County

This data contains maximum model-derived ocean currents (in meters per second) 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) scen

Date published: January 1, 2019

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

This data contains maximum model-derived ocean currents (in meters per second) 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) scen

Date published: January 1, 2019

Structure-from-motion point cloud of Mud Creek, Big Sur, California, 2017-05-27

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 NAD83

Date published: January 1, 2019

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

This data contains maximum model-derived ocean currents (in meters per second) 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) scen

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 flood-hazard projections: 20-year storm in Santa Barbara County

This data contains geographic extents of projected coastal flooding, low-lying vulnerable areas, and maximum/minimum flood potential (flood uncertainty) associated with 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-ind

Date published: January 1, 2019

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

This data contains maximum model-derived ocean currents (in meters per second) 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) scen

Date published: January 1, 2019

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

This data contains maximum model-derived ocean currents (in meters per second) 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) scen

Date published: January 1, 2019

Fishes of Ryer Island, Suisun Bay, California, 2016-2017 (ver. 1.1, June 2019)

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. For prior versions of the data contact Dennis Steinke at dsteinke@usgs.gov. First released...

Date published: January 1, 2019

CoSMoS (Coastal Storm Modeling System) Central California v3.1 water-level projections: 1-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

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

Filter Total Items: 485
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Year Published: 2015

Predicting locations of post-fire debris-flow erosionin the San Gabriel Mountains of southern California

Timely hazard assessments are needed to assess post-fire debris flows that may impact communities located within and adjacent to recently burned areas. Implementing existing models for debris-flow probability and magnitude can be time-consuming because the geographic extent for applying the models is manually defined. In this study, a model is...

Gartner, Joseph E.; Santi, P.M; Cannon, Susan H.
Gartner, J.E., Santi, P.M., and Cannon, S.H. (2015), Predicting locations of post-fire debris-flow erosion in the San Gabriel Mountains of southern California, Natural Hazards, 77:1305–1321, DOI 10.1007/s11069-015-1656-3.

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Year Published: 2015

Geologic map of the Bodie Hills, California and Nevada

The Bodie Hills covers about 1,200 km2 straddling the California-Nevada state boundary just north of Mono Lake in the western part of the Basin and Range Province, about 20 km east of the central Sierra Nevada. The area is mostly underlain by the partly overlapping, middle to late Miocene Bodie Hills volcanic field and Pliocene to late...

John, David A.; du Bray, Edward A.; Box, Stephen E.; Vikre, Peter G.; Rytuba, James J.; Fleck, Robert J.; Moring, Barry C.
John, D.A., du Bray, E.A., Box, S.E., Vikre, P.G., Rytuba, J.J., Fleck, R.J., and Moring, B.C., 2015, Geologic map of the Bodie Hills, California and Nevada: U.S. Geological Survey Scientific Investigations Map 3318, 64 p., 2 sheets, scale 1:50,000, http://dx.doi.org/10.3133/sim3318.

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Year Published: 2015

“All Models Are Wrong, but Some Are Useful”

Building a new model, especially one used for policy purposes, takes considerable time, effort, and resources. In justifying such expenditures, one inevitably spends a lot of time denigrating previous models. For example, in pitching the third Uniform California Earthquake Rupture Forecast (UCERF3) (http://www.WGCEP.org/UCERF3), criticisms of the...

Field, Edward H.
Field, E. H. (2015). “All Models Are Wrong, but Some Are Useful”, Seismological Research Letters Volume 86, Number 2A March/April 2015, doi: 10.1785/02201401213

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Year Published: 2015

Paleoseismologic evidence for large-magnitude (Mw 7.5-8.0) earthquakes on the Ventura blind thrust fault: Implications for multifault ruptures in the Transverse Ranges of southern California

Detailed analysis of continuously cored boreholes and cone penetrometer tests (CPTs), high-resolution seismic-reflection data, and luminescence and 14C dates from Holocene strata folded above the tip of the Ventura blind thrust fault constrain the ages and displacements of the two (or more) most recent earthquakes. These two earthquakes, which are...

McAuliffe, Lee J.; Dolan, James F.; Rhodes, Edward J.; Hubbard, Judith; Shaw, John H.; Pratt, Thomas L.
McAuliffe, L.J., Dolan, J.F., Rhodes, E.J., Hubbard, J., Shaw, J.H., and Pratt, T.L., 2015, Paleoseismologic evidence for large-magnitude (Mw≥7.5) earthquakes on the Ventura blind thrust fault: Implications for multi-fault ruptures in the Transverse Ranges of southern California, Geosphere, v. 11, no. 5, p. 1629-1650. doi:10.1130/GES01123.1

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Year Published: 2015

Study 8: Prevalence and load of Nanophyetus salmincola infection in outmigrating steelhead trout from five Puget Sound rivers

Nanophyetus salmincola is a parasitic trematode, or flatworm, that infects salmonid fishes in the Pacific Northwest, including Washington, Oregon, and portions of California. The adult worm lives in the intestine of fish-eating birds and mammals. Eggs shed into the water hatch into miracidia which penetrate the first intermediate host, one of two...

Chen, M.F.; Stewart, B.A.; Senkvik, Kevin; Hershberger, Paul
Chen, M.F., B.A. Stewart, K. Peabody, K. Snekvik, and P. Hershberger. 2015. Study 8: Prevalence and load of Nanophyetus salmincola infection in outmigrating steelhead trout from five Puget Sound Rivers. Pages 46-48 in Puget Sound Steelhead Marine Survival Workgroup. December 2015. Salish Sea Marine Survival Project – Puget Sound Steelhead Marine Survival: 2013-2015 research findings summary. Long Live the Kings, Seattle, WA.

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Year Published: 2014

Empirical models for predicting volumes of sediment deposited by debris flows and sediment-laden floods in the transverse ranges of southern California

Debris flows and sediment-laden floods in the Transverse Ranges of southern California pose severe hazards to nearby communities and infrastructure. Frequent wildfires denude hillslopes and increase the likelihood of these hazardous events. Debris-retention basins protect communities and infrastructure from the impacts of debris flows and sediment...

Gartner, Joseph E.; Cannon, Susan H.; Santi, Paul M
Gartner, J.E., Cannon, S.H., and Santi, P.M. (2014), Empirical models for predicting volumes of sediment deposited by debris flows and sediment-laden floods in the transverse ranges of southern California, Engineering Geology, 176, 24, Pages 45-56, 10.1016/j.enggeo.2014.04.008.

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Year Published: 2014

Geodetic constraints on the 2014 M 6.0 South Napa earthquake

On 24 August 2014, the M 6.0 South Napa earthquake shook much of the San Francisco Bay area, leading to significant damage in the Napa Valley. The earthquake occurred in the vicinity of the West Napa fault (122.313° W, 38.22° N, 11.3 km), a mapped structure located between the Rodger’s Creek and Green Valley...

Barnhart, William D.; Murray, Jessica R.; Yun, S H; Svarc, Jerry L.; Samsonov, SV; Fielding, EJ; Brooks, Benjamin A.; Milillo, Pietro

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Year Published: 2014

A VS30 map for California with geologic and topographic constraints

For many earthquake engineering applications, site response is estimated through empirical correlations with the time‐averaged shear‐wave velocity to 30 m depth (VS30). These applications therefore depend on the availability of either site‐specific VS30 measurements or VS30 maps at local, regional, and global scales....

Thompson, Eric; Wald, David J.; Worden, Charles
E. M. Thompson, D. J. Wald, and C. B. Worden (2014). A VS30 Map for California with Geologic and Topographic Constraints Bulletin of the Seismological Society of America 104, 2313-2321.

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Year Published: 2014

A large mantle water source for the northern San Andreas Fault System: A ghost of subduction past

Recent research indicates that the shallow mantle of the Cascadia subduction margin under near-coastal Pacific Northwest U.S. is cold and partially serpentinized, storing large quantities of water in this wedge-shaped region. Such a wedge probably formed to the south in California during an earlier period of subduction. We show by numerical...

Kirby, Stephen H.; Wang, Kelin; Brocher, Thomas M.

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Year Published: 2014

Development of the Coastal Storm Modeling System (CoSMoS) for predicting the impact of storms on high-energy, active-margin coasts

The Coastal Storm Modeling System (CoSMoS) applies a predominantly deterministic framework to make detailed predictions (meter scale) of storm-induced coastal flooding, erosion, and cliff failures over large geographic scales (100s of kilometers). CoSMoS was developed for hindcast studies, operational applications (i.e., nowcasts and multiday...

Barnard, Patrick L.; van Ormondt, Maarten; Erikson, Li H.; Jodi Eshleman; Hapke, Cheryl J.; Peter Ruggiero; Peter Adams; Foxgrover, Amy C.
Barnard, Patrick L., van Ormondt, Maarten, Erikson, Li H., Eshleman, Jodi, Hapke, Cheryl, Ruggiero, Peter, Adams, Peter N., and Foxgrover, Amy C., 2014, Development of the Coastal Storm Modeling System (CoSMoS) for predicting the impact of storms on high-energy, active-margin coasts: Natural Hazards, v. 74, i. 2, pp. 1095-1125, doi:10.1007/s11069-014-1236-y

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Year Published: 2014

Quantitative rock-fall hazard and risk assessment for Yosemite Valley, Yosemite National Park, California

Rock falls are common in Yosemite Valley, California, posing substantial hazard and risk to the approximately four million annual visitors to Yosemite National Park. Rock falls in Yosemite Valley over the past few decades have damaged structures and caused injuries within developed regions located on or adjacent to talus slopes highlighting the...

Stock, Greg M.; Luco, Nicolas; Collins, Brian D.; Harp, Edwin L.; Reichenbach, Paola; Frankel, Kurt L.
Quantitative rock-fall hazard and risk assessment for Yosemite Valley, Yosemite National Park, California; 2014; SIR; 2014-5129; Stock, Greg M.; Luco, Nicolas; Collins, Brian D.; Harp, Edwin L.; Reichenbach, Paola; Frankel, Kurt L.

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Year Published: 2014

Sediment concentrations, flow conditions, and downstream evolution of two turbidity currents, Monterey Canyon, USA

The capacity of turbidity currents to carry sand and coarser sediment from shallow to deep regions in the submarine environment has attracted the attention of researchers from different disciplines. Yet not only are field measurements of oceanic turbidity currents a rare achievement, but also the data that have been collected consist mostly of...

Xu, Jingping; Octavio E. Sequeiros; Noble, Marlene A.
Xu, J.P., Sequeiros, O.E., Noble, M.A., 2014, Sediment concentrations, flow conditions, and downstream evolution of two turbidity currents, Monterey Canyon, USA: Deep Sea Research Part I: Oceanographic Research Papers, v. 89, pp. 11–34, doi: 10.1016/j.dsr.2014.04.001.

Filter Total Items: 1,119
A boat carrying lots of equipment motors out of a yacht harbor, waters are calm, engines churn up the water at the stern.
June 11, 2019

PCMSC research vessel Parke Snavely departs for deployment

The PCMSC research vessel R/V Parke Snavely heads out of the Vallejo Marina on June 11, 2019 to deploy instrument frames in Grizzly Bay for the ERO19 study.

A man wearing a straw hat checks the equipment mounted on a tripod frame.
June 10, 2019

Tripod preparation for ERO19

Lukas Winkler-Prins checks on the frame setup on June 10, 2019.  This tripod has an RBR CTD, an RBR bursting pressure sensor, an RBR optical backscatter sensor, a LISST-200X, an altimeter, and two Nortek ADVs + Seapoint optical backscatter sensors, which will reveal information about water temperature and salinity, wave height and period, total suspended sediment

...
May 30, 2019

PubTalk 5/2019 - Rodgers Creek Fault

Title: New Mapping of the Rodgers Creek Fault: It's longer and more complex than we thought

  • Remote sensing technology reveals surface traces of the fault covered by trees and buildings.
  • Greater fault length and linkages to neighboring faults make larger earthquakes possible. 
  • Fault complexity has implications for hazards from ground shaking
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).

Satellite view of a bay with islands, with markers plotted to show sample locations and instrument placement.
May 13, 2019

San Pablo Bay study area

The USGS Pacific and Coastal Marine Science Center collected data to investigate sediment dynamics in the shallows of San Pablo Bay in two deployments: February to March 2011 (ITX11) and May to June 2012 (ITX12). This data release includes time-series data and grain-size distributions from sediment grabs collected during the deployments. During each deployment, time series

...
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.

...
Photo of a calm creek with a small sandbar in the middle, creek is surrounded by trees burned by a wildfire.
May 2, 2019

Whiskey Creek section of Whiskeytown Lake

In the aftermath of the 2018 Carr Fire, northern California, sediment has eroded from burned hillslopes and accumulated in some areas of Whiskeytown Lake. A recent sediment deposit is shown here in the Whiskey Creek section of the lake. USGS scientists study landscape evolution after fires and storm rainfall to determine how intensively these disturbances impact affected

...
Pod of dolphins, viewed from high above the ocean.
April 23, 2019

Pod of dolphins captured during aerial photographic survey

Full size image of a pod of dolphins captured during an aerial photographic survey Fall 2018.

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.

 

Filter Total Items: 992
USGS
November 1, 2016

A new study from the USGS suggests that some early 20th century earthquakes in southern California might have been induced (man-made) by past practices that were used by the oil and gas industry.

a picture of a flooded road in San Diego, CA
October 27, 2016

This week is California Flood Preparedness week, and local, state, and federal agencies are reminding Californians to be aware and be prepared for potential potential flooding hazards as we enter the rainy season.

Two side-by-side (before, 2002 & after) aerial photos of the same cliff by the beach. Photo on right from 2010 shows landslide.
October 21, 2016

U.S. Geological Survey 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.

USGS
October 17, 2016

A new study offers the most sophisticated analyses to date on how Los Angeles-area groundwater supplies are replenished. The analyses provide water managers with a clearer understanding of the sources and amount of available groundwater in the region – information that is important for planning and management of the vital resource.

Photo showing the Great Basin area
October 11, 2016

Large precipitation events that occur about every 10 years are a critical source of recharge for replenishing groundwater resources, according to a new study by the U.S. Geological Survey and the Bureau of Reclamation.

Golden Eagle in flight
September 28, 2016

Roughly over a quarter of the golden eagles killed at the Altamont Pass Wind Resource Area in Northern California from 2012-2014 were recent immigrants to the local population, according to research led by the U.S. Geological Survey. 

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