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Filter Total Items: 364
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).

USACE Drill Operator
Date Published: March 8, 2019
Status: Active

Soil Stratigraphy and Erosion Potential on the American and Sacramento Rivers

Much of the Sacramento region is protected from flooding by levees constructed on the American and Sacramento Rivers, which join near downtown Sacramento before flowing to the Sacramento-San Joaquin River Delta.

Salinas Valley
Date Published: February 27, 2019
Status: Active

Salinas and Carmel River Basins Study

Together, the Salinas and Carmel river basins include some of the world’s most fertile agricultural lands and are internationally known for their natural beauty; ecological diversity; multi-national cultural history; and recreation opportunities such as fishing, auto racing, and golfing. The area is oftentimes referred to as the “Salad Bowl of the World” or “America’s Salad Bowl” because of...

Salinas Valley
Date Published: February 27, 2019
Status: Active

Salinas and Carmel Rivers Basin Study: Paso Robles Model Update

The existing Paso Robles Basin Model (PRBM) needed to be updated and enhanced to achieve the timeline and objectives of the Salinas Carmel River Basin Study (SCRBS) for the U.S. Bureau of Reclamation (Reclamation) and local partners.

Pajaro Valley
Date Published: February 26, 2019
Status: Active

Pajaro Valley Hydrologic Model Update, Data Collection, and Analysis for Sustainability

The Pajaro Valley is home to a billion-dollar agricultural industry, providing food and food processing services for the nation. The water for these enterprises is supplied, in large part, by the groundwater resources (aquifers) in the area. The Pajaro Valley Water Management Agency (PV Water) and the USGS have partnered to improve aquifer monitoring software, allowing better quantification...

2017 Pacific Winter Floods Hydrograph for Nevada
Date Published: February 26, 2019
Status: Completed

2017 Pacific Winter Floods

Learn more about USGS flood activities related to the 2017 Pacific Winter Floods caused by widespread rains across California and western Nevada.

December 2014 Pacific Coast flood events
Date Published: February 26, 2019
Status: Completed

December 2014 Pacific Coast Floods

Learn more about USGS flood activities related to the December 2014 Pacific Coast floods, which included flash floods, heavy snows, high winds, and mudslides throughout Oregon, Washington, and California.

map of Indian Wells Valley displaying subbasin boundaries and shaded by recharge in mm/year
Date Published: February 4, 2019
Status: Completed

Using the Basin Characterization Model (BCM) to Estimate Natural Recharge in Indian Wells Valley, California

Located in the northern Mojave Desert, the Indian Wells Valley has an arid environment, receiving only 4-6 inches of precipitation annually. Like most desert areas, Indian Wells Valley communities rely mostly on groundwater for their available groundwater supply. Increases in urban and agricultural development have resulted in increased groundwater pumpage for public and agricultural use,...

Contacts: Dina Saleh
 Study area of North Coast counties
Date Published: January 31, 2019
Status: Completed

Climate and Natural Resources Analysis and Planning for California's Northern Coast

The North Coast Resource Partnership (NCRP) is an innovative, stakeholder-driven collaboration among local government, Tribes, watershed groups, and interested partners in the North Coast region of California. The North Coast comprises seven counties, Tribal lands, major watersheds, and a planning area of 19,390 square miles representing 12% of California's landscape. The NCRP integrates long-...

Map of study domain shown in blue and yellow
Date Published: January 30, 2019
Status: Completed

Climate Ready Vulnerability Assessment

To create a framework for adapting to climate change, decision makers need to understand specific threats to our water supply, land use suitability, hazard risks, ecosystems and quality of life. A vulnerability assessment that defines the projected degree to which an ecosystem, landscape, or watershed is vulnerable to change will help to create this framework. Presently those who are open to...

location map of Cuyama Valley
Date Published: January 30, 2019
Status: Completed

Cuyama Valley Water Availability Study

Currently, groundwater is the only source for domestic, agricultural and municipal water use in the Cuyama Valley groundwater basin in Santa Barbara County, California. Groundwater withdrawals, mainly to irrigate agricultural crops, have resulted in water-level declines of as much as 300 feet in the area since the 1940s. To plan for sustainable future use of the groundwater, the U.S....

Contacts: Claudia C Faunt
Filter Total Items: 405
USGS
January 1, 2019

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

USGS
January 1, 2019

The data include atmospheric-loading frequency response functions (table 1) and filtered detrended and reconstructed (trends restored) groundwater-levels (tables 2 to 4) computed for selected, parsed time series for three USGS monitoring wells [28A-25-1 (373904118570701); 28A-25-2 (373904118570702); and 14A-25-1 (373927118571701)], and the associated hourly res

Long thin colorful shape, a map of a strip of coastline whose colors correspond to varying offshore sediment thicknesses.
January 1, 2019

This part of DS 781 presents data for the depth-to-transition map of the Point Sur to Point Arguello, California, region. The raster data file is included in the “DepthToTransition_PointSurToPointArguello.zip,” which is accessible from https://doi.org/10.5066/P97CZ0T7.
As part of the USGS's California State Waters Mapping Project, a 50-m grid of sediment thic

Map of a coastline with an outline drawn around a portion of the coast land to show where the study area is.
January 1, 2019

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

USGS
January 1, 2019

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

USGS
January 1, 2019

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

Map of a western coastline with stretches of the coast labeled to identify data set regions.
January 1, 2019

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

USGS
January 1, 2019

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

Map of a coastline with an outline drawn around a portion of the coast land to show where the study area is.
January 1, 2019

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

USGS
January 1, 2019

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

USGS
January 1, 2019

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

USGS
January 1, 2019

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: 321
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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

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

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

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Year Published: 2016

Annualized earthquake loss estimates for California and their sensitivity to site amplification

Input datasets for annualized earthquake loss (AEL) estimation for California were updated recently by the scientific community, and include the National Seismic Hazard Model (NSHM), site‐response model, and estimates of shear‐wave velocity. Additionally, the Federal Emergency Management Agency’s loss estimation tool, Hazus, was updated to include...

Chen, Rui; Jaiswal, Kishor; Bausch, D; Seligson, H; Wills, C.J.

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Year Published: 2016

Constraining the relative importance of raindrop- and flow-driven sediment transport mechanisms in postwildfire environments and implications for recovery time scales

Mountain watersheds recently burned by wildfire often experience greater amounts of runoff and increased rates of sediment transport relative to similar unburned areas. Given the sedimentation and debris flow threats caused by increases in erosion, more work is needed to better understand the physical mechanisms responsible for the observed...

McGuire, Luke; Kean, Jason W.; Staley, Dennis M.; Rengers, Francis K.; Wasklewicz, Thad A.
McGuire, L. A., J. W. Kean, D. M. Staley, F. K. Rengers, and T. A. Wasklewicz (2016), Constraining the relative importance of raindrop- and flow-driven sediment transport mechanisms in postwildfire environments and implications for recovery time scales, J. Geophys. Res. Earth Surf., 121, 2211–2237, doi:10.1002/2016JF003867.

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Year Published: 2016

Model simulations of flood and debris flow timing in steep catchments after wildfire

Debris flows are a typical hazard on steep slopes after wildfire, but unlike debris flows that mobilize from landslides, most post-wildfire debris flows are generated from water runoff. The majority of existing debris-flow modeling has focused on landslide-triggered debris flows. In this study we explore the potential for using process-based...

Rengers, Francis K.; McGuire, Luke; Kean, Jason W.; Staley, Dennis M.; Hobley, D.E.J

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Year Published: 2016

Preliminary results from exploratory sampling of wells for the California oil, gas, and groundwater program, 2014–15

Introduction In 2014 and 2015, the U.S. Geological Survey (USGS) sampled water wells in the Los Angeles Basin and southern San Joaquin Valley, California, and oil wells in the San Joaquin Valley for analysis of multiple chemical, isotopic, and groundwater-age tracers. The purpose of this reconnaissance sampling...

McMahon, Peter B.; Kulongoski, Justin T.; Wright, Michael T.; Land, Michael T.; Landon, Matthew K.; Cozzarelli, Isabelle M.; Vengosh, Avner; Aiken, George R.
McMahon, P.B., Kulongoski, J.T., Wright, M.T., Land, M.T., Landon, M.K., Cozzarelli, I.M., Vengosh, Avner, and Aiken, G.R., 2017, Preliminary results from exploratory sampling of wells for the California oil, gas, and groundwater program, 2014–15 (ver 1.1, January 2017): U.S. Geological Survey Open-File Report 2016–1100, 8 p., http://dx.doi.org/10.3133/ofr20161100.

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Year Published: 2016

Relative distribution and abundance of fishes and crayfish in 2010 and 2014 prior to saltcedar (Tamarix ssp.) removal in the Amargosa River Canyon, southeastern California

The Amargosa River Canyon, located in the Mojave Desert of southeastern California, contains the longest perennial reach of the Amargosa River. Because of its diverse flora and fauna, it has been designated as an Area of Critical Environmental Concern and a Wild and Scenic River by the Bureau of Land Management. A survey of fishes conducted in...

Hereford, Mark E.
Hereford, M.E., 2016, Relative distribution and abundance of fishes and crayfish in 2010 and 2014 prior to saltcedar (Tamarix ssp.) removal in the Amargosa River Canyon, southeastern California: U.S. Geological Survey Open-File Report 2016–1112, 18 p., http://dx.doi.org/10.3133/ofr20161112.

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Year Published: 2016

Evaluation of a floating fish guidance structure at a hydrodynamically complex river junction in the Sacramento-San Joaquin River Delta, California, USA

Survival of out-migrating juvenile Chinook salmon (Oncorhynchus tshawytscha) in the Sacramento–San Joaquin River delta, California, USA, varies by migration route. Survival of salmonids that enter the interior and southern Delta can be as low as half that of salmonids that remain in the main-stem Sacramento River. Reducing entrainment into...

Romine, Jason G.; Perry, Russell W.; Pope, Adam C.; Stumpner, Paul; Liedtke, Theresa L.; Kumagai, Kevin K.; Reeves, Ryan L.
Romine, J.G., R.W. Perry, A.C. Pope, P. Stumpner, T.L. Liedtke, K.K. Kumagai, and R.L. Reeves. 2016. Evaluation of a floating fish guidance structure at a hydrodynamically complex river junction in the Sacramento–San Joaquin River Delta, California, USA. Mar. Freshwater Res. (Online Early).

Filter Total Items: 1,164
July 12, 2019

Animation of Ridgecrest Earthquake Seq. thru July 6 (Prelim. Results)

This animation shows preliminary results from precise relocation of the Ridgecrest earthquake sequence, through July 6 (UTC), including the foreshock sequence and the first ~20 hours of aftershocks from M 7.1 mainshock.  The animation begins in a map view and then transitions into a rotating vertical slice.  Earthquakes are colorcoded by time of occurrence, with early

Portable Seismic Station
July 9, 2019

Portable Seismic Station

Two portable sensors: a strong motion sensor (to record strong shaking that can be felt) and a broadband sensor (to record weak motion for detecting small earthquakes) buried into the ground to detect earthquakes. These stations can be quickly deployed and send real-time data back to the USGS via cellular telemetry immediately after they are installed. 

July 9, 2019

California Earthquakes (July 2019) - Animation Sequence

This video shows the earthquake events a few hours before the M6.4 on July 4th, 2019 till after the M7.1 on July 8th, 2019. The blue dots are the events associated with the M6.4 and then red dots are events associated with the M7.1

briefing navy
July 9, 2019

USGS provides briefing to Navy about Ridgecrest Earthquake Sequence

Kate Scharer (USGS) provides CO CAPT Paul Dale (Navy) with the field mapping team’s initial product, showing the surface fault rupture at NAWSCL as well as the temporarily deployed seismic and GPS sensors that were rapidly deployed. Contributions of field data from within the base were from CGS & USGS, and from outside the base were from Univ. of Nevada, Reno, EERI,

...
briefing navy
July 9, 2019

USGS provides briefing to Navy about Ridgecrest Earthquake Sequence

Kate Scharer (USGS) provides CO CAPT Paul Dale (Navy) with the field mapping team’s initial product, showing the surface fault rupture at NAWSCL as well as the temporarily deployed seismic and GPS sensors that were rapidly deployed. Contributions of field data from within the base were from CGS & USGS, and from outside the base were from Univ. of Nevada, Reno, EERI,

...
access road offset
July 8, 2019

Helicopter Overflight Viewing Access Road Fault Offset

California Geological Survey and USGS geologists and geophysicists with National Guard and Navy personnel view road damage from 3 to 5 feet of right-lateral motion near the expected maximum slip locality along the primary tectonic rupture associated with the M 7.1 event.

fault scarp
July 8, 2019

Inspecting the Vertical Offset Fault Scarp

Scientists from USGS & California Geological Survey viewing vertical fault offset of ~12 +/- 3 foot high fault scarp near the expected maximum slip locality along the primary tectonic rupture associated with the M 7.1 event.

aerial view of road damage after the Ridgecrest, CA earthquake
July 8, 2019

Road Damage from the Ridgecrest, CA Earthquake

On July 8, 2019, California Geological Survey and USGS geologists and geophysicists with National Guard and Navy personnel, view the road damage resulting from 3 to 5 feet of right-lateral motion near the expected maximum slip locality along the primary tectonic rupture associated with the M 7.1 Ridgecrest earthquake on July 5, 2019.

lidar truck
July 8, 2019

Scanning surface rupture from Searles Valley earthquake

 

USGS Earthquake Science Center Mobile Laser Scanning truck operated by Ben Brooks and Todd Ericksen scanning the surface rupture near the zone of maximum surface displacement of the M7.1 Searles Valley earthquake.

rupture
July 8, 2019

Northern end of rupture resulting from the M7.1 Searles Valley quake

Fault rupture crosses dirt road, with California Geologial Survey vehicles for scale. Displacement at this location is primarily normal (vertical). Photograph taken near the northern end of the rupture resulting from the M7.1 Searles Valley earthquake.

fault rupture
July 7, 2019

Searles Valley Earthquake field photo #3

USGS Geophysicists Elizabeth Cochran and Nick VanDerElst install a seismometer on the base.

fault rupture
July 7, 2019

Searles Valley Earthquake field photo #4

USGS geodesist Todd Ericksen sets up GPS surveying equipment on July 5th.

Filter Total Items: 913
Long Valley Caldera and domes viewed from the top of Mammoth Mounta...
August 15, 2018

A new study by CalVO seismologists used a novel geophysical technique called "full waveform seismic tomography" to image the roots of Long Valley Caldera in eastern California.

Map highlighting sampling locations of 339 Northern Spotted Owls used in Miller, et al, 2018
August 2, 2018

Federal researchers used landscape genetics to evaluate the role that forest connectivity plays in determining genetic connectivity for the federally-threatened northern spotted owl.

Three men stand together in front of the United States flag smiling for the camera.
July 31, 2018

Patrick Barnard and Li Erikson of the USGS Pacific Coastal and Marine Science Center in Santa Cruz, California are recognized for their leadership in developing the Coastal Storm Modeling System (CoSMoS).

Aquatic ecologist holding Tule Perch
July 25, 2018

With the development of the Central Valley (CVP) and State Water (SWP) projects, the natural flow of the Sacramento-San Joaquin Delta has been reengineered to provide water for California’s growing population and agricultural needs. These changes have drastically reduced natural wetlands, affecting the habitat of native fish species, including the threatened Delta Smelt. To address the situation, joint operations of the CVP and SWP must balance human water demands on the Delta with protection of its fragile ecosystem and species of concern, especially those listed as threatened or endangered under state and federal laws.

Animation is looking at an angle at a coastal cliff region with a newly cut road running across it, showing how it has changed.
July 18, 2018

USGS scientists produced an animated GIF in coordination with the California Department of Transportation (Caltrans) re-opening of State Highway 1 through Big Sur on July 18, 2018.

Ducks and geese float on the water at the Cosumnes River Preserve
July 13, 2018

The Cosumnes River watershed has seasonal, non-point source hotspots for total mercury and methylmercury production, which discharge to the Sacramento-San Joaquin River Delta in north-central California. To reduce mercury loads to the Delta, researchers created open-water deep cells at the downstream end of wetlands.

House perched above the ocean on a cliff.
July 9, 2018

Coastal cliffs from Santa Barbara to San Diego might crumble at more than twice the historical rate by the year 2100 as sea levels rise.

An animated GIF of an owl on a tree with a bobbing head going around in a circle.
July 9, 2018

In a study led by the USGS, researchers developed a framework to infer inbreeding rates of Northern Spotted Owls when incomplete parentage information exists.

USGS
April 18, 2018

recently-published study co-authored by two CalVO scientists brings attention to the role that lava dams played in shaping Lake Tahoe.

Filter Total Items: 220