Unified Interior Regions
Nevada
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
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.
News
TNMCorps Mapping Challenge Summary Results for Schools in CA & NV
Summary statistics are now available for this challenge. Thanks again to everyone who contributed!
FINISHED!! TNMCorps Mapping Challenge for Schools in CA & NV
This challenge is now complete! Thank you to everyone who contributed!
New Report Highlights Declining Sagebrush Ecosystem, Provides Foundation for Next Generation of Conservation and Management
Fort Collins, CO – Considered one of the most imperiled ecosystems in the world and home to mule deer, pronghorn, sage-grouse, pygmy rabbits and more than 350 other species of conservation concern, the sagebrush ecosystem continues to shrink rapidly due to a host of growing threats, according to a new scientific report.
Publications
Field response and surface rupture characteristics of the 2020 M6.5 Monte Cristo Range earthquake, central Walker Lane, Nevada
The M 6.5 Monte Cristo Range earthquake that occurred in the central Walker Lane on 15 May 2020 was the largest earthquake in Nevada in 66 yr and resulted in a multidisciplinary scientific field response. The earthquake was the result of left‐lateral slip along largely unmapped parts of the Candelaria fault, one of a series of east–...
Koehler, Richard D; Dee, Seth; Elliott, Austin John; Hatem, Alexandra Elise; Pickering, Alexandra; Pierce, Ian; Seitz, Gordon G.
Examination of movements and survival of Pahranagat roundtail chub (Gila robusta jordani) in the Pahranagat River and adjacent waters, Nevada, 2014–18
Executive SummaryThe Pahranagat roundtail chub (Gila robusta jordani; hereinafter “chub”) was federally listed as endangered in 1970 (U.S. Fish and Wildlife Service, 1970). In the decades following the listing, the chub has declined to extremely low numbers (Tuttle and others, 1990; Guadalupe, 2014). Loss of available habitat appears to be one of...
Martin, Barbara A.; Hayes, Brian S.; Harris, Alta C.
Aeromagnetic map of Mountain Pass and vicinity, California and Nevada
Magnetic investigations of Mountain Pass and vicinity were begun as part of an effort to study regional crustal structures as an aid to understanding the geologic framework and mineral resources of the eastern Mojave Desert. The study area, which straddles the state boundary between southeastern California and southern Nevada, encompasses Mountain...
Ponce, David A.; Ponce, David A.; Denton, Kevin M.
White River spinedace (Lepidomeda albivallis) and White River desert suckers (Catostomus clarki) - KFFS
Species Studied
White River spinedace (Lepidomeda albivallis) and White River desert suckers (Catostomus clarki)
Pahranagat roundtail chub (Gila robusta) - KFFS
Species Studied
Pahranagat roundtail chub (Gila robusta)
Quaternary Hydroclimate Records of Spring Ecosystems
Desert springs and wetlands are among the most biologically productive, diverse, and fragile ecosystems on Earth. They are home to thousands of rare, endemic, and endangered plants and animals and reflect the availability and health of emergent groundwater. Despite the ecological importance of these wetlands, our knowledge of how they might respond to predicted future climate change is limited...
Quantifying watershed controls on fine sediment particles and nutrient loading to Lake Tahoe using data mining and machine learning
Since the late 1980’s, the USGS has collected discharge, sediment, and water quality data at seven major drainages under the Lake Tahoe Interagency Monitoring Program (LTIMP). Recently, continuous, real-time measurements of turbidity were added to the LTIMP. These data can be combined with in situ, model simulations, and remotely-sensed datasets available from the USGS, National Aeronautics...
Southwestern Willow Flycatcher Habitat Viewer
For planning and management purposes, agencies require a web application that can locate, map, and monitor Southwestern Willow Flycatcher (flycatcher) breeding habitat across its range. The Habitat Viewer can identify potential flycatcher habitat and monitor changes caused by stressors, such as beetles, fire or drought.
Nutrient Source Identification in Groundwater and Periphyton Along the Nearshore of Lake Tahoe
High concentrations of phosphorus (P) and nitrogen (N) are responsible for excessive, or nuisance algal blooms in many ecosystems world-wide, and climate change is predicted to exacerbate the problem1,2. Excessive nutrients supplied to the nearshore zone of Lake Tahoe may have significant consequences to ecological communities, water clarity, and water quality. The nearshore zone...
Past Perspectives of Water in the West
In the intermountain west, seasonal precipitation extremes, combined with population growth, are creating new challenges for the management of water resources, ecosystems, and geologic hazards. This research contributes a comprehensive long-term context for a deeper understanding of past hydrologic variability, including the magnitude and frequency of drought and flood extremes and ecosystem...
Drivers and Impacts of North Pacific Climate Variability
Climate model forecasts indicate an increase in extreme hydrologic events, including floods and droughts, for California and the western U.S. in the future. To better understand what the consequences of this future change in climate may be, USGS scientists are studying the frequency, magnitude, and impacts of past hydroclimate variability and extremes in the region. This project produces well-...
Information by Region - Nevada
Cheatgrass and Medusahead
Invasive annual grasses, such as cheatgrass (Bromus tectorum) and medusahead (Taeniatherum caput-medusae), are one of the most significant stressors to rangeland ecosystems in the western U.S. Their expansion and dominance across this area are the most damaging ecosystem agents on this iconic landscape.
United States Assessments of Undiscovered Oil and Gas Resources
USGS Energy Resources Program provides periodic assessments of the oil and natural gas endowment of the United States and the World. This website provides access to new, prioritized, assessment results and supporting data for the United States, as part of the Energy Policy and Conservation Act (EPCA).
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.
Melt inclusion and mineral geochemical analyses supporting the evaluation of petrogenesis, degassing, and metallogenic potential of mid-Cenozoic rhyolite magmas in northern Nevada, USA
This data release presents geochemical analyses of silicate melt inclusions, host quartz phenocrysts, and biotite phenocrysts in samples collected by the U.S. Geological Survey (USGS) from mid-Cenozoic rhyolitic rocks from northern Nevada. Igneous intrusions and volcanic rocks in this study encompass nineteen rhyolitic samples from five magmatic centers across northeastern Nevada. Rhyoli
Southwestern Willow Flycatcher Habitat Viewer
The Flycatcher Habitat Viewer was developed to meet the needs of organizations by providing maps of predicted flycatcher breeding habitat throughout its range. Maps are provided from 2013 to present and cover 57 satellite scenes. Maps identify predicted flycatcher habitat based upon the amount of green vegetation within a 120-m radius of each cell, and the size of floodplain within a 360-m...
Discharge, nutrient, and suspended sediment data for selected streams in the Lake Tahoe watershed
A time series of nutrient and mean daily discharge data were used to create models of daily concentration and loads for selected streams of the Lake Tahoe watershed. A total of 15 sites have records ranging from as early as 1972 to 2017. Nutrients in the data set include nitrate, ammonium, Kjeldahl Nitrogen, orthophosphate, and total phosphorus. Total suspended sediment concentrations a
Geochemical data used in the tungsten skarn mineral resource assessment of the Great Basin region of western Nevada and eastern California
The U.S. Geological Survey (USGS) has undertaken a mineral resources assessment for tungsten for a portion of the Great Basin in parts of western Nevada and east-central California. This data release provides the Great Basin Tungsten Database: the geospatial and geologic data, and results of chemical analyses for 46,955 samples collected in the assessment area, extracted from the USGS
Global Geochemical Database for Critical Minerals in Archived Mine Samples
The Critical Minerals in Archived Mine Samples Database (CMDB) contains chemistry and geologic information for historic ore and ore-related rock samples from mineral deposits in the United States. In addition, the database contains samples from archetypal deposits from 27 other countries in North America, South America, Asia, Africa and Europe. Samples were obtained from archived ore
Mineralogic, grain-size, biologic, and stable isotopic analyses of core TOPGUN-SODA10 2A-K from Big Soda Lake, Nevada, USA.
These data were collected from the TOPGUN-SODA10 2AK core collected in 2010 by LacCore (University of Minnesota), the USGS. and the University of California (U.C.) Berkeley. The 8.9 meter length core had stable isotopes of oxygen and carbon sampled every 10 millimeters or so, and diatoms samples at every 50 millimeters to 200 millimeters depending on the depth in the core. mineralo
Domestic Wells in the United States
Domestic wells provide drinking water supply for approximately 40 million people in the United States. Knowing the location of these wells, and the populations they serve, is important for identifying heavily used aquifers, locations susceptible to contamination, and populations potentially impacted by poor-quality groundwater.
Data for assessing the susceptibility of groundwater used for drinking water supply from selected principal aquifers of the Western United States, 2004-2018
Groundwater age distribution and susceptibility to natural and anthropogenic contaminants were assessed for selected principal aquifers of the Western United States: the Central Valley aquifer system (CVAL), the Basin and Range basin-fill aquifers (BNRF), the Rio Grande aquifer system (RIOG), the High Plains aquifer (HPAQ), the Columbia Plateau basaltic-rock aquifers (
Drainage basins and characteristics for selected streamgages within the Southern Rockies Landscape Conservation Cooperative domain
Streamflow and basin-characteristic data are needed for a variety of scientific applications including estimation of flow in ungaged basins and hydro-ecological classification of rivers. The U.S. Geological Survey (USGS), in cooperation with the Bureau of Reclamation and the Southern Rockies Landscape Conservation Cooperative (SRLCC), selected a subset of streamgages across the SRLC
Micrometeorological and Soil-Moisture Data at the Amargosa Desert Research Site in Nye County near Beatty, Nevada, January 1, 2017 to May 31, 2019
This data release describes micrometeorological and soil-moisture data collected from January 1, 2017 through May 31, 2019 at the Amargosa Desert Research Site adjacent to a low-level radioactive waste and hazardous chemical waste facility near Beatty, Nevada. Micrometeorological data include precipitation, solar radiation, air temperature, relative humidity, saturated and amb
Data to accompany U.S. Geological Survey Data Series 1099: Petrographic, geochemical and geochronologic data for Cenozoic volcanic rocks of the Tonopah, Divide, and Goldfield Mining Districts, Nevada
This dataset is the assembled analytical results of geochemical, petrographic, and geochronologic data for samples, principally those of unmineralized Tertiary volcanic rocks, from the Tonopah, Divide, and Goldfield mining districts of west-central Nevada. Much of the data presented here for the Tonopah and Divide districts are for samples collected by Bonham and Garside (1979) du
National Water Information System (NWIS) Mapper
The NWIS mapper provides access to over 1.5 million sites contained in the USGS National Water Information System (NWIS), including sites where current and historical surface-water, groundwater, springs, and atmospheric data has been collected. Users can search by site type, data type, site number, or place.
Domestic wells provide drinking water supply for approximately 40 million people in the United States. Knowing the location of these wells, and the populations they serve, is important for identifying heavily used aquifers, locations susceptible to contamination, and populations potentially impacted by poor-quality groundwater.
Figure 4. Yearly Distribution (2007-2019) of Tamarisk Beetle (Diorhabda spp.). Annual tamarisk beetle distribution map. Provided by RiversEdge West. 2020. Used with permission from Ben Bloodgood, Program Coordinator.
This map shows the provinces assessed by the USGS for undiscovered oil and gas resources.
Scientists at WERC's Dixon Field station have fitted Cinnamon Teal with GPS backpacks. Using R, the telemetry locations are displayed on an image every two weeks.
Figure 6. Map showing changes in predicted flycatcher habitat along the upper Gila River after conducting a tamarisk leaf beetle-impact simulation. The upper Gila River was divided into nine zones in order to quantify changes. A satellite model was used to predict flycatcher habitat at a 40-percent probability threshold.
Figure 5. Map showing changes in predicted flycatcher habitat along the lower Virgin River, Nevada and Arizona, 2010–2015, as determined from a satellite model at a 40-percent probability threshold.
Map showing relative changes in predicted flycatcher habitat, as determined from a satellite model at a 40-percent probability threshold, Southwestern United States, 2013–15.
Map showing area of predicted flycatcher breeding habitat (averaged across 2013–15) at all elevations in 6,521 U.S. Geological Survey 7.5-minute quadrangles, Southwestern United States. Only areas within a prescribed distance of streams and greater than stream-order 3, or within 1 kilometer of a lake or reservoir, were included in this analysis.
Figure 1. Maps showing location of the project area and the 35 U.S. Fish and Wildlife Service Southwestern Willow Flycatcher management unit boundaries, designated critical-habitat reaches, and waterbodies considered by the satellite model for regionwide modeling, Southwestern United States.
The 3DEP products and services available through The National Map consist of standard digital elevation models (DEMs) at various horizontal resolutions, elevation source and associated datasets, an elevation point query service and bulk point query service. All 3DEP products are available, free of charge and without use restrictions.
Field response and surface rupture characteristics of the 2020 M6.5 Monte Cristo Range earthquake, central Walker Lane, Nevada
The M 6.5 Monte Cristo Range earthquake that occurred in the central Walker Lane on 15 May 2020 was the largest earthquake in Nevada in 66 yr and resulted in a multidisciplinary scientific field response. The earthquake was the result of left‐lateral slip along largely unmapped parts of the Candelaria fault, one of a series of east–...
Koehler, Richard D; Dee, Seth; Elliott, Austin John; Hatem, Alexandra Elise; Pickering, Alexandra; Pierce, Ian; Seitz, Gordon G. Examination of movements and survival of Pahranagat roundtail chub (Gila robusta jordani) in the Pahranagat River and adjacent waters, Nevada, 2014–18
Executive SummaryThe Pahranagat roundtail chub (Gila robusta jordani; hereinafter “chub”) was federally listed as endangered in 1970 (U.S. Fish and Wildlife Service, 1970). In the decades following the listing, the chub has declined to extremely low numbers (Tuttle and others, 1990; Guadalupe, 2014). Loss of available habitat appears to be one of...
Martin, Barbara A.; Hayes, Brian S.; Harris, Alta C. Aeromagnetic map of Mountain Pass and vicinity, California and Nevada
Magnetic investigations of Mountain Pass and vicinity were begun as part of an effort to study regional crustal structures as an aid to understanding the geologic framework and mineral resources of the eastern Mojave Desert. The study area, which straddles the state boundary between southeastern California and southern Nevada, encompasses Mountain...
Ponce, David A.; Ponce, David A.; Denton, Kevin M.
Isostatic gravity map of Mountain Pass and vicinity, California and Nevada
Gravity investigations of Mountain Pass and vicinity were begun as part of an effort to study regional crustal structures as an aid to understanding the geologic framework and mineral resources of the eastern Mojave Desert. The study area, which straddles the state boundary between southeastern California and southern Nevada, encompasses Mountain...
Ponce, David A.; Ponce, David A.; Denton, Kevin M.
Geophysical and geologic maps of Mountain Pass and vicinity, California and Nevada
U.S. Geological Survey Scientific Investigations Map 3412 is a series of products that consists of geophysical and geologic maps of Mountain Pass and vicinity, California. Maps A and B (red outline in above map image) are gravity and aeromagnetic maps, respectively. The map series was begun as part of an effort to study regional crustal structures...
Ponce, David A. Earthquake potential in California-Nevada implied by correlation of strain rate and seismicity
Rock mechanics studies and dynamic earthquake simulations show that patterns of seismicity evolve with time through (1) accumulation phase, (2) localization phase, and (3) rupture phase. We observe a similar pattern of changes in seismicity during the past century across California and Nevada. To quantify these changes, we correlate GPS strain...
Zeng, Yuehua; Petersen, Mark D.; Shen, Zheng-Kang The 2008 Wells, Nevada earthquake sequence: Source constraints using calibrated multiple event relocation and InSAR
The 2008 Wells, NV earthquake represents the largest domestic event in the conterminous U.S. outside of California since the October 1983 Borah Peak earthquake in southern Idaho. We present an improved catalog, magnitude complete to 1.6, of the foreshock-aftershock sequence, supplementing the current U.S. Geological Survey (USGS) Preliminary...
Nealy, Jennifer; Benz, Harley M.; Hayes, Gavin P.; Berman, Eric; Barnhart, William D. 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. Cyanide poisoning of a Cooper’s hawk (Accipiter cooperii)
A Cooper’s hawk (Accipiter cooperii) was found dead in a ditch leading from a heap leach pad at a gold mine in Nevada. Observations at autopsy included an absence of external lesions, traces of subcutaneous and coronary fat, no food in the upper gastrointestinal tract, and no lesions in the viscera. Cyanide concentrations (µg/g ww) were 5.04 in...
Franson, J. Christian
A satellite model of Southwestern Willow Flycatcher (Empidonax traillii extimus) breeding habitat and a simulation of potential effects of tamarisk leaf beetles (Diorhabda spp.), southwestern United States
Executive Summary The study described in this report represents the first time that a satellite model has been used to identify potential Southwestern Willow Flycatcher (Empidonax traillii extimus) (hereinafter referred to as “flycatcher”) breeding habitat rangewide for 2013–15. Fifty-seven Landsat scenes were required to map the...
Hatten, James R. Chemical abrasion-SIMS (CA-SIMS) U-Pb dating of zircon from the late Eocene Caetano caldera, Nevada
Zircon geochronology is a critical tool for establishing geologic ages and time scales of processes in the Earth's crust. However, for zircons compromised by open system behavior, achieving robust dates can be difficult. Chemical abrasion (CA) is a routine step prior to thermal ionization mass spectrometry (TIMS) dating of zircon to remove...
Watts, Kathryn E.; Coble, Matthew A.; Vazquez, Jorge A.; Henry, Christopher D.; Colgan, Joseph P.; John, David A.
Gravity and magnetic studies of the eastern Mojave Desert, California and Nevada
IntroductionFrom May 2011 to August 2014, the U.S. Geological Survey (USGS) collected gravity data at more than 2,300 stations and physical property measurements on more than 640 rock samples from outcrops in the eastern Mojave Desert, California and Nevada. Gravity, magnetic, and physical-property data are used to study and locate regional...
Denton, Kevin M.; Ponce, David A.
What Does a USGS Hydrologic Technician Do
What do USGS Hydrologic Technicians do on the job? This video features five different Hydrologic Technicians from Washington Water Science Center and Nevada Water Science Center sharing some of their work. This video was sponsored by the USGS Hydrologic Data Advisory Committee.
White River spinedace
White River spinedace. Photo taken Wayne E. Kirch Wildlife Management Area, Lund, NV.
White River spinedace
White River spinedace. Photo taken Wayne E. Kirch Wildlife Management Area, Lund, NV.
White River desert sucker
White River desert sucker. Photo taken Wayne E. Kirch Wildlife Management Area, Lund, NV.
USGS passive integrated transponder (PIT) detection antenna
Passive integrated transponder detection antenna located in the Flag Springs Complex in eastern Nevada. This is the only place on earth where White River spinedace still exist.
White River spinedace
White River spinedace. Photo taken Wayne E. Kirch Wildlife Management Area, Lund, NV.
Third Creek, NV
View of near shore Third Creek, NV
Water Sampling at Soldier Meadows Spring Complex in Nevada
In September 2020, field crews in the USGS Nevada Water Science Center measured spring flow and collected water-quality samples at locations around the Soldier Meadows Spring Complex in Nevada. The spring complex is the only home of a small fish called the desert dace. USGS is collaborating with local and federal partners
...
GeoDAWN: Geoscience Data Acquisition for Western Nevada
The USGS Earth Mapping Resources Initiative and USGS 3D Elevation Program (3DEP), Department of Energy Geothermal Technologies Office, Natural Resources Conservation Services, and Bureau of Land Management have partnered to conduct airborne geophysical and 3DEP lidar surveys over parts of Nevada and California to collect information on undiscovered geothermal, critical
...
Land Treatment Exploration Tool: A Quick Introduction
This is a quick introduction video to the Land Treatment Exploration Tool. This short video includes a summary of the tool with screen clips of the fact sheet, web tool, and an example Site Characterization Report.
These tutorial videos were created to aid in the use of the Land Treatment Exploration Tool (LTET). These videos
Land Treatment Exploration Tool—Step 1: Describe Proposed Treatment
This video describes Step 1 of the Land Treatment Exploration Tool. In Step 1 the user defines a name, the planned treatment/s, and a file name for exported items.
These tutorial videos were created to aid in the use of the Land Treatment Exploration Tool (LTET). These videos guide a user through the main steps of the tool.
Land Treatment Exploration Tool — Step 2: Select Treatment Boundary
This video describes Step 2 of the Land Treatment Exploration Tool. In Step 2 the user defines their planned treatment boundary. The user can load a zipped shapefile or on-screen digitize their boundary.
These tutorial videos were created to aid in the use of the Land Treatment Exploration Tool (LTET). These videos guide a
Summary statistics are now available for this challenge. Thanks again to everyone who contributed!
This challenge is now complete! Thank you to everyone who contributed!
Fort Collins, CO – Considered one of the most imperiled ecosystems in the world and home to mule deer, pronghorn, sage-grouse, pygmy rabbits and more than 350 other species of conservation concern, the sagebrush ecosystem continues to shrink rapidly due to a host of growing threats, according to a new scientific report.
Volunteers contributed almost 800 edits toward this challenge since last week. This includes the removal of over 100 points that were either closed or represented the wrong feature type - NICE WORK!!
Volunteers continue to make progress on this challenge with almost 400 edits coming in since last week!
Summary statistics are now available for this challenge. Thanks again to everyone who contributed!
Volunteers contibuted over 300 edits since this challenge was launched last week. This includes the removal of points that are either closed or the wrong feature type. Thank you for helping to update The National Map!
This challenge is now complete! Thank you to everyone who contributed!
TNMCorps Mapping Challenges continue on the Pacific coast with a new challenge for schools in California and Nevada! This is an excellent challenge for Peer Reviewers and Advanced Editors since all the existing points have already been edited, but there are many points needing to be reviewed. Don’t forget to look for missing schools too!
Volunteers continue to make progress on this challenge as more edits come in!
Summary statistics are now available for this challenge. Thanks again to everyone who contributed!
Restoration Assessment and Monitoring Program for the Southwest (RAMPS)
A Program of the Southwest Biological Science Center & Ecosystems Mission Area
To subscribe to our newsletter, please visit: https://listserv.usgs.gov/mailman/listinfo/ramps
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Locations
Nevada Water Science Center
Phone: (775) 887-7600
Fax: (775) 887-7629
Nevada Water Science Center Henderson Office
Phone: (702) 564-4500
Western Ecological Research Center - Henderson Field Station
Phone: (702) 564-4560
Fax: (702) 564-4600
Research Drilling Program (USGS California Water Science Center)
Phone: 702-823-1117