Unified Interior Regions

Arizona

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: 142
Date published: July 8, 2019
Status: Active

Concealed Rare Earth Element (REE) Terranes in the Southern Basin and Range Geologic Province

The project is developing an understanding of the types, sizes, and spatial distribution of rare earth element (REE) related deposits in the southern Basin and Range geologic province to help ensure the availability of rare earth elements to the U.S.

Contacts: Mark Bultman
Date published: July 1, 2019
Status: Active

Lunar Legacy at the USGS Astrogeology Science Center

Click on the links below to explore USGS Astrogeology Center's involvement in the Apollo program and lunar legacy:

Date published: June 26, 2019
Status: Active

Information by Region-Arizona

  

Date published: June 11, 2019
Status: Active

GCMRC Online Maps

The Grand Canyon Monitoring and Research Center maintains an enterprise GIS platform built upon ESRI ArcGIS Server and Portal applications.  This enterprise system allows for spatial data, maps and analytical tools to be served through online applications.  The Geospatial Science and Technology project provides access to this content through different avenues.  Online maps can be accessed...

Date published: June 11, 2019
Status: Active

GCMRC Data Releases

Data releases made available by GCMRC can be found here as they are published via the USGS Fundamental Science Practices (FSPs).  Individual science product links will take users to the USGS ScienceBase website for each entry.

 

Click on Data and Tools Tab to see list of Data Releases.

Date published: May 13, 2019
Status: Completed

Baerbel Lucchitta

Dr. Baerbel Lucchitta was one of the first women in the field of Astrogeology. She started her career by mapping the Moon and instructing the Apollo Astronauts. She worked extensively on the Valles Marineris canyons on Mars, is a vigorous protagonist of glacial flow and other ice-related features on Mars, and was awarded the Geological Society of America, Planetary Geology Division, G.K....

Date published: April 30, 2019
Status: Active

GCMRC Scientist & Staff Directory

Below is a list of GCMRC scientists and key project support staff with their contact information provided.  Names and positions are linked to each individual's USGS staff profile page (where applicable), so click there to find out more about each person's background, research interests and science products.  Clicking on email addresses will generate a new email message to that individual....

Date published: April 29, 2019
Status: Active

GCMRC Data and Tools

The Grand Canyon Monitoring and  Research Center offers a collection of data resources and online tools -- including web maps, applications, and other content -- that convey scientific information related to on-going monitoring of the Colorado River.  Some applications are a culmination of long-term monitoring work, while others are developed around more a specific set of information usually...

Date published: April 24, 2019
Status: Active

Grand Canyon Monitoring and Research Projects

The Grand Canyon Monitoring and Research Center currently functions under a Triennial Work Plan (TWP) which is thoroughly reviewed and vetted both internally within the Center and through the GCDAMP Technical Work Group (TWG) and the Adaptive Management Work Group (AMWG).  These advisory panels have been a part of the Glen Canyon Dam...

Date published: March 27, 2019
Status: Completed

Grover Photo Collection

The Apollo Lunar Roving Vehicle was an engineering marvel, but It would have collapsed on Earth under the weight of a suited astronaut. That's because it was designed to operate in lunar gravity, which pulls with about 15% as much force as Earth gravity. In the 1960s, engineers at the U.S. Geological Survey's Astrogeology Branch built a near-copy of the Apollo rover that could...

Date published: February 26, 2019
Status: Completed

August-September 2014 Southwest Floods

Learn more about USGS flood activities related to the August-September 2014 Floods, caused by heavy rains followed by remnants of Hurricane Odile which brought major flooding to parts of Arizona.

Filter Total Items: 61
Date published: January 27, 2020

Geochemical and X-ray diffraction analyses of drill core samples from the Canyon uranium-copper deposit, a solution-collapse breccia pipe, Grand Canyon area, Coconino County, Arizona

This data release compiles the major and trace element analytical results of drill core samples that typify the uranium-copper ore bodies of the Canyon deposit, located about 6.1 miles (10 km) south-southeast of Tusayan, Arizona. The Canyon deposit lies from about 750 to 2,000 ft (230 to 610 m) below the surface at latitude 35.88333 North, longitude -112.09583 West (datum WGS 19

Date published: September 26, 2019

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 (

Date published: September 6, 2019

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

Date published: June 12, 2019

GCMRC GIS Base Map Viewer 2.0

The Geospatial team of the Grand Canyon Monitoring and Research Center maintains an enterprise GIS system built upon ESRI ArcGIS Server and Portal applications.  This web application provides access to many of the most commonly used GIS layers and base data information used by GCMRC in support of on-going science projects. 

Click here to launch the Base Map Viewer (2.0) in a separate...

Date published: June 12, 2019

GCMRC REST Services Page

The Geospatial team of Grand Canyon Monitoring and Research Center maintains an enterprise GIS system built upon ESRI ArcGIS Server and Portal applications.  From this platform, geospatial content can be consumed in a variety of forms, from custom-built web applications to content hosted on ESRI's ArcGIS Online to direct access of web map services provided here on our REST services page.

Date published: May 10, 2019

Predicted Shorelines for High Flows on the Colorado River Application

This application highlights modeled flows of the Colorado River for a discharge of 41,000 cubic feet per second (cfs) that is approximate to recent (2012 - 2018) and future anticipated water releases associated with a High Flow Experiments conducted from Glen Canyon Dam near Page, Arizona.  These data are to help visualize the water levels during High Flow Events in relation to other map...

Date published: April 30, 2019

Sandbar Monitoring Sites - Remote Camera Photographs Application

GCMRC and Northern Arizona University have engaged in long-term monitoring of 45 sandbar sites along the Colorado River in Grand Canyon for close to three decades.  Remote cameras have been established to monitor sandbar changes in between site surveys that occur every Fall.   This application provides access to thousands of photos, with an option to view photos around specific high flow...

Date published: April 29, 2019

Geospatial Data Abstraction Library (GDAL)

The Geospatial Data Abstraction Library is a translator library for raster geospatial data formats that is released under an X/MIT style Open Source license by the Open Source Geospatial Foundation. As a library, it presents a single abstract data model for all supported formats. It also comes with a variety of useful...

Date published: April 29, 2019

Astro Web Maps

Our Web Mapping Services (WMS) and Web Feature Services (WFS) are based on Open Geospatial Consortium standards and allow capable mapping clients to view full-resolution planetary mosaicked Basemaps.  Besides being available for community use, these services are critical for many of our others...

Date published: January 1, 2019

Surface Materials Data from Breccia-Pipe Uranium Mine and Reference Sites, Arizona, USA

This data release includes elemental analysis of soil samples collected at breccia-pipe uranium mines, at one undeveloped breccia-pipe uranium deposit, and at a reference site in northern Arizona. Samples were collected near the Arizona 1, Canyon, Kanab North, and Pinenut uranium mines, over the EZ2 breccia-pipe uranium deposit, and at the Little Robinson Tank reference site. Sampl

Date published: December 6, 2018

Downloadable Data for Northern Arizona Oil and Gas Assessments

GIS Data for Northern Arizona Oil and Gas Assessments 

Filter Total Items: 44
Themis global thermal-inertia tile map
November 5, 2018

This product is a global thermal inertia mosaic of Mars generated from high-resolution Thermal Emission Imaging System (THEMIS) nighttime infrared images (Christensen et al., 2004; Fergason et al., 2006a) that allows the identification, assessment, and global correlation of martian surface materials. The higher spatial resolution of THEMIS data (100 m per pixel), relative to Thermal Emission...

Kaguya TC Ortho V02 Global Mosaic 474m (64ppd)
November 5, 2018

The Japan Aerospace Exploration Agency (JAXA) launched "KAGUYA (SELENE)" to obtain scientific data of the lunar origin and evolution and to develop the technology for the future lunar exploration. With permission from JAXA, researchers at the U.S. Geological Survey (USGS) Astrogeology Science Center have compiled and are releasing multiple near-global mosaics derived from data acquired by the...

Gusev Crater Thermal Emission Imaging System (THEMIS) Infrared mosaic
November 5, 2018

In 2003-2005, the USGS worked under the guidance of NASA's Mars Critical Data Products Initiative to conduct research on how controlled large area or global 2001 Mars Odyssey THEMIS IR image mosaics could be generated. The products listed here represent a sampling of the significant data files generated during that research.

Mars Themis Day Mosaics
November 5, 2018

The objective of this work is to assemble and cartographically control Thermal Emission Imaging System (THEMIS; Christensen et al. 2004) daytime infrared (IR) and nighttime IR images. In a cartographically controlled mosaic, individual images are registered to one another so that all feature boundaries align. This intermediate mosaic (a “semi-controlled” mosaic) is then registered to a known...

Mars Themis Night Mosaics
November 5, 2018

The objective of this work is to assemble and cartographically control Thermal Emission Imaging System (THEMIS; Christensen et al. 2004) daytime infrared (IR) and nighttime IR images. In a cartographically controlled mosaic, individual images are registered to one another so that all feature boundaries align. This intermediate mosaic (a “semi-controlled” mosaic) is then registered to a known...

Tile Map MOLA
November 5, 2018

The objective of this work is to assemble and cartographically control Thermal Emission Imaging System (THEMIS; Christensen et al. 2004) daytime infrared (IR) and nighttime IR images. In a cartographically controlled mosaic, individual images are registered to one another so that all feature boundaries align. This intermediate mosaic (a “semi-controlled” mosaic) is then registered to a known...

Perspective views of the central peak of Tsiolkovskiy crater Digital elevation data derived from Apollo Panoramic images
November 5, 2018

USGS LMMP products will soon be available at the LMMP Portal. These include very large high resolution DTMs and orthomosaics of close to 50 key sites on the lunar surface, and high resolution controlled polar mosaics. These products constitute an important initial step in processing LRO datasets and should greatly facilitate the exploration and study of these significant lunar sites.

Portion of the Coprates quad which includes Valles Marineris
November 5, 2018

This global image map of Mars has a resolution of 256 pixels/degree (scale approximately 231 m/pixel at the equator). The black-and-white mosaic is processed to emphasize local topographic features. This mosaic, known as Mars Digital Image Model (MDIM) 2.1, replaces two earlier mosaics produced by the USGS from the same set of approximately 4600 Viking Orbiter images...

Mars Control Vectors
November 5, 2018

Distributed here are control network data for solar system bodies (planets, moons, and asteroids) other than the Earth. Each control network is essentially a set of photogrammetric or radargrammetric solution (input and output) files. The input files consist of, aside from a priori information, measurements of common points (control points, or sometimes tie points) on images of...

Mars MOLA Tracks
November 5, 2018

The U.S. Geological Survey has recently completed a final revised version of its 231 m/pixel global Viking image mosaic of Mars that has substantially improved geodetic accuracy compared to versions released in 1991 and 2001. This mosaic, known as MDIM 2.1, is currently available in the USGS ISIS file format and will be formatted and submitted to the NASA Planetary Data System (PDS) in...

THEMIS nighttime infrared mosaic of Gale crater, landing site of the Mars Science Laboratory rover
November 5, 2018

The main science objective of the Mars Science Laboratory (MSL) is to explore and quantitatively assess the habitability and environmental history of a local region on the martian surface. This mission will use a variety of instruments carried on a rover platform that are designed to assess the biological potential, characterize the geology, investigate planetary processes that influence...

A full image scan of a Zond8 photograph
November 5, 2018

Photographic hardcopy scans of 1970 photographs captured by a Soyuz 7K-L1 unmanned spacecraft on the soviet Zond8 mission. This data along with data from Apollo, Lunar Orbiter and Galileo missions is part of a collection commonly referred to as the Lunar Consortium Data.

Filter Total Items: 130
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Year Published: 2011

Probability and volume of potential postwildfire debris flows in the 2011 Wallow burn area, eastern Arizona

This report presents a preliminary emergency assessment of the debris-flow hazards from drainage basins burned in 2011 by the Wallow wildfire in eastern Arizona. Empirical models derived from statistical evaluation of data collected from recently burned drainage basins throughout the intermountain western United States were used to estimate the...

Ruddy, Barbara C.
Probability and volume of potential postwildfire debris flows in the 2011 Wallow burn area, eastern Arizona; 2011; OFR; 2011-1214; Ruddy, Barbara C.

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Year Published: 2011

Probability and volume of potential postwildfire debris flows in the 2011 Horseshoe II burn area, southeastern Arizona

This report presents a preliminary emergency assessment of the debris-flow hazards from drainage basins burned in 2011 by the Horseshoe II wildfire in southeastern Arizona. Empirical models derived from statistical evaluation of data collected from recently burned drainage basins throughout the intermountain western United States were used to...

Ruddy, Barbara C.
Probability and volume of potential postwildfire debris flows in the 2011 Horseshoe II burn area, southeastern Arizona; 2011; OFR; 2011-1197; Ruddy, Barbara C.

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Year Published: 2011

Probability and volume of potential postwildfire debris flows in the 2011 Monument burn area, southeastern Arizona

This report presents a preliminary emergency assessment of the debris-flow hazards from drainage basins burned by the Monument wildfire in southeastern Arizona, in 2011. Empirical models derived from statistical evaluation of data collected from recently burned drainage basins throughout the intermountain Western United States were used to...

Ruddy, Barbara C.; Verdin, Kristine L.
Probability and volume of potential postwildfire debris flows in the 2011 Monument burn area, southeastern Arizona; 2011; OFR; 2011-1181; Ruddy, Barbara C. ; Verdin, Kristine L.

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Year Published: 2010

Hydrological, geological, and biological site characterization of breccia pipe uranium deposits in Northern Arizona

On July 21, 2009, U.S. Secretary of the Interior Ken Salazar proposed a two-year withdrawal of about 1 million acres of Federal land near the Grand Canyon from future mineral entry. These lands are contained in three parcels: two parcels on U.S. Bureau of Land Management land to the north of the Grand Canyon (North and East Segregation Areas) and...

Alpine, Andrea E.
Hydrological, Geological, and Biological Site Characterization of Breccia Pipe Uranium Deposits in Northern Arizona; 2010; SIR; 2010-5025; Alpine, Andrea E., ed.

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Year Published: 2008

Ground-Water, Surface-Water, and Water-Chemistry Data, Black Mesa Area, Northeastern Arizona - 2006-07

The N aquifer is the major source of water in the 5,400 square-mile Black Mesa area in northeastern Arizona. Availability of water is an important issue in northeastern Arizona because of continued water requirements for industrial and municipal use and the needs of a growing population. Precipitation in the Black Mesa area is typically about 6 to...

Truini, Margot; Macy, J.P.
Ground-Water, Surface-Water, and Water-Chemistry Data, Black Mesa Area, Northeastern Arizona - 2006-07; 2008; OFR; 2008-1324; Truini, Margot; Macy, J. P.

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Year Published: 2008

Use of Superposition Models to Simulate Possible Depletion of Colorado River Water by Ground-Water Withdrawal

According to the 'Law of the River', wells that draw water from the Colorado River by underground pumping need an entitlement for the diversion of water from the Colorado River. Consumptive use can occur through direct diversions of surface water, as well as through withdrawal of water from the river by underground pumping. To develop methods for...

Leake, Stanley A.; Greer, William; Watt, Dennis; Weghorst, Paul
Use of Superposition Models to Simulate Possible Depletion of Colorado River Water by Ground-Water Withdrawal; 2008; SIR; 2008-5189; Leake, Stanley A.; Greer, William; Watt, Dennis; Weghorst, Paul

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Year Published: 2007

Dissolved solids in basin-fill aquifers and streams in the southwestern United States

The U.S. Geological Survey National Water-Quality Assessment Program performed a regional study in the Southwestern United States (Southwest) to describe the status and trends of dissolved solids in basin-fill aquifers and streams and to determine the natural and human factors that affect dissolved solids. Basin-fill aquifers, which include the...

Anning, David W.; Bauch, Nancy J.; Gerner, Steven J.; Flynn, Marilyn E.; Hamlin, Scott N.; Moore, Stephanie J.; Schaefer, Donald H.; Anderholm, Scott K.; Spangler, Lawrence E.
Dissolved Solids in Basin-Fill Aquifers and Streams in the Southwestern United States; 2007; SIR; 2006-5315; Anning, David W.; Bauch, Nancy J.; Gerner, Steven J.; Flynn, Marilyn E.; Hamlin, Scott N.; Moore, Stephanie J.; Schaefer, Donald H.; Anderholm, Scott K.; Spangler, Lawrence E.

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Year Published: 2007

Ground-Water, Surface-Water, and Water-Chemistry Data, Black Mesa Area, Northeastern Arizona-2005-06

The N aquifer is the major source of water in the 5,400 square-mile Black Mesa area in northeastern Arizona. Availability of water is an important issue in northeastern Arizona because of continued water requirements for industrial and municipal use and the needs of a growing population. Precipitation in the Black Mesa area averages about 6 to 14...

Truini, Margot; Macy, J.P.
Ground-Water, Surface-Water, and Water-Chemistry Data, Black Mesa Area, Northeastern Arizona-2005-06; 2007; OFR; 2007-1041; Truini, Margot; Macy, J.P.

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Year Published: 2007

Rapid estimation of recharge potential in ephemeral-stream channels using electromagnetic methods, and measurements of channel and vegetation characteristics

To classify recharge potential (RCP) in ephemeral-stream channels, a method was developed that incorporates information about channel geometry, vegetation characteristics, and bed-sediment apparent electrical conductivity (??a). Recharge potential is not independently measurable, but is instead formulated as a site-specific, qualitative parameter...

Callegary, J.B.; Leenhouts, J.M.; Paretti, N.V.; Jones, Christopher A.
Rapid estimation of recharge potential in ephemeral-stream channels using electromagnetic methods, and measurements of channel and vegetation characteristics; 2007; Article; Journal; Journal of Hydrology; Callegary, J. B.; Leenhouts, J. M.; Paretti, N. V.; Jones, C. A.

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Year Published: 2006

Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona--2004-05

The N aquifer is the major source of water in the 5,400-square-mile area of Black Mesa in northeastern Arizona. Availability of water is an important issue in this area because of continued industrial and municipal use, a growing population, and precipitation of about 6 to 14 inches per year. The monitoring program in the Black Mesa area has...

Truini, Margot; Macy, J.P.
Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona--2004-05; 2006; OFR; 2006-1058; Truini, Margot; Macy, J. P.

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Year Published: 2006

Electrical resistance sensors record spring flow timing, Grand Canyon, Arizona

Springs along the south rim of the Grand Canyon, Arizona, are important ecological and cultural resources in Grand Canyon National Park and are discharge points for regional and local aquifers of the Coconino Plateau. This study evaluated the applicability of electrical resistance (ER) sensors for measuring diffuse, low-stage (<1.0 cm)...

Adams, E.A.; Monroe, S.A.; Springer, Abraham E.; Blasch, K.W.; Bills, D.J.
Electrical resistance sensors record spring flow timing, Grand Canyon, Arizona; 2006; Article; Journal; Ground Water; Adams, E. A.; Monroe, S. A.; Springer, A. E.; Blasch, K. W.; Bills, D. J.

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Year Published: 2005

Lithology and thickness of the Carmel Formation as related to leakage between the D and N aquifers, Black Mesa, Arizona

Truini, Margot; Macy, J.P.
Lithology and thickness of the Carmel Formation as related to leakage between the D and N aquifers, Black Mesa, Arizona; 2005; SIR; 2005-5187; Truini, Margot; Macy, J. P.

Filter Total Items: 243
June 11, 2020

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

June 11, 2020

Land Treatment Exploration Tool — Step 3: Explore Site Characteristics

This video describes Step 3 of the Land Treatment Exploration Tool. In Step 3 the user is guided to the Site History tab to explore land treatment and wildfire history of their planned treatment area. They are also directed to the Fish and Wildfire Information for Planning and Consultation tool to investigate areas of overlap with endangered species, migratory birds, and

June 11, 2020

Land Treatment Exploration Tool— Step 4: Prop. Treatment Area & Report

This video describes Step 4 and the developing report of the Land Treatment Exploration Tool. In Step 4 the used selects layers to generate spatial overlap statistics with their planned treatment boundary. Summary tables are generated and displayed in the Report tab, where a user can create a PDF Site Characterization Report for their planned treatment boundary. Optionally

June 11, 2020

Land Treatment Exploration Tool — Step 5: Select Search Parameters

This video describes Step 5 of the Land Treatment Exploration Tool. In Step 5 the user determines a distance or boundary to search for legacy Land Treatment Digital Library records. The user also indicates if the returned LTDL treatments are statistically evaluated against the planned treatment boundary using a Bray-Curtis Dissimilarity calculation.

These tutorial

June 11, 2020

Land Treatment Exploration Tool — Step 6: Compare the LTDL Treatments

This video describes Step 6 of the Land Treatment Exploration Tool. In Step 6 the user filters through the returned list of legacy LTDL treatments to identify records that contain useful information or context for the current planned treatment boundary. Selected treatments are added to the developing report and subsequent exported Site Characterization PDFs.  

These

A photo of a distressed desert
May 21, 2020

Disturbed desert landscape with erosion

Disturbed desert landscape with erosion

A photo of a distressed desert of the Sonoran Desert
May 21, 2020

distressed desert of the Sonoran Desert - carousal

distressed desert of the Sonoran Desert, carousal image

A photo of a field crew measuring density of grasses
May 21, 2020

Field Crew Measuring Density of Grasses

Field crew measuring cover of Lehmann Lovegrass (Eragrostis lehmanniana) and Boer Lovegrass (E. curvula var. conferta = E. chloromelas) in a desert grassland of southern Arizona. 

A photo of Sonoran Desert of the Kofa National Wildlife Refuge in Arizona
May 21, 2020

Sonoran Desert of the Kofa National Wildlife Refuge

The Sonoran Desert of the Kofa National Wildlife Refuge in Arizona.

Photo of a disturbed desert landscape
May 21, 2020

Disturbed desert landscape

Disturbed desert landscape 

A photo of a desert landscape
May 21, 2020

Desert landscape

Desert landscape

A photo of a distressed desert
May 21, 2020

Distressed desert

Distressed desert 

Filter Total Items: 200
USGS scientist Ted Kennedy uses a net to collect invertebrates in front of the Glen Canyon Dam.
July 8, 2020

A new study describes how food web dynamics influence the movement of mercury throughout the Colorado River in the Grand Canyon. This new research from the U.S. Geological Survey and partners represents one of the first times that the movement and fate of mercury has been traced through an entire food web.

TNMCorps Mapping Challenge: City/Town Halls in AZ, NM and UT w/ Incorporated Places
January 16, 2020

Calling all Peer Reviewers and Advanced Editors! This challenge is SO CLOSE to being finished!! 

TNMCorps Mapping Challenge: City/Town Halls in AZ, NM and UT
January 6, 2020

This challenge is close to being finished with over 100 points added since our last update - nice work!  However, there are still several green points that we need our Peer Reviewers and Advanced Editors to help review.

TNMCorps Mapping Challenge: City/Town Halls in AZ, NM and UT
December 18, 2019

Here is the weekly update for this challenge!  If you're looking for a break from the snow and the cold, come take a virtual tour of the southwest while helping us to collect city/town hall structures! 

TNMCorps Mapping Challenge: City/Town Halls in AZ, NM and UT
December 12, 2019

Topo maps in the West will soon be updated, so we've opened a new challenge for city/town halls in Utah, New Mexico, and Arizona!  

aerial view of road damage after the Ridgecrest, CA earthquake
October 15, 2019

Effects from the two July 2019 Ridgecrest, CA earthquakes were observed in several USGS continuous groundwater-level monitoring sites in California, Nevada, and Arizona.

Colorado River Lees Ferry at sunrise
April 25, 2019

The Grand Canyon Monitoring and Research Center currently has 11 active science projects as a part of its Triennial Work Plan (FY2018-2020) for work conducted as the science provider to the Glen Canyon Dam Adaptive Management Program.  New developments, recent publications and other current activities will be listed here.  Check here to find out the latest information from the Center.

A huge canyon surrounded by deep-set cliffs opens to reveal a sunny gorge and part of the Colorado River.
April 11, 2019

A new study shows that mysterious cycles in salinity in the lower Colorado River are a result of precipitation patterns in the headwaters of the upper basin more than a thousand river miles away. The salinity levels generally repeat about every 10 years.

This is a photo of a view of Lake Powell's south shore.
March 18, 2019

Mercury concentrations within Lake Powell are highest in side canyons within the lower portion of the reservoir, according to a new U.S. Geological Survey report. This finding is part of a study to better understand why mercury concentrations in striped bass are higher in the lower part of the reservoir.

Filter Total Items: 84