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: November 16, 2018
Status: Active

Consortium Meetings

Consortium Meetings

Consortium hosted meetings will be listed below. If you would like to attend any of these meetings, please be sure to register. Should your plans change after you register, you may simply reregister with your changes detailed appropriately.

Please follow these links to view summaries of past consortium hosted workshops.

Date published: November 14, 2018
Status: Completed

North Pole

North Pole News

Date published: November 14, 2018
Status: Completed

Mars Ice

The Mars-Ice project is a joint project between the USGS Astrogeology Research Program (Flagstaff, AZ) and the Arizona State University Mars Space Flight Facilty (Tempe, AZ) to bring together a single resource for the exploration of martian ices. Much of this research is done at the USGS Flagstaff Science Center.

Date published: November 14, 2018
Status: Completed

Data And Instruments

Data and Instruments

Date published: November 14, 2018
Status: Completed

The Mars Global Digital Dune Database

The Mars Global Digital Dune Database (MGD3)

The Mars Global Digital Dune Database (MGD3)was compiled and released in three parts, encompassing the area from latitude 65°N to 65°S, from 60°N to 90°N (the north polar region), and from 60° to 90°S (south polar region). All the remote sensing data for both GIS and non-GIS users is available online in three U.S. Geological Survey...

Date published: November 14, 2018
Status: Completed

Mars Dune Image Galleries

Mars Dune Image Galleries: CRISM, THEMIS, MOC and HiRISE

Date published: November 14, 2018
Status: Completed

Dune Classification

A detailed classification system for Martian dunes is currently in the works. However, we have summarized current classifications below. You can find more information on terrestrial dune classification by clicking here.

Date published: November 9, 2018
Status: Completed

Consortium Announcements and Meetings

Consortium hosted meetings will be listed below. If you would like to attend any of these meetings, please be sure to register. Should your plans change after you register, you may simply reregister with your changes detailed appropriately.

Date published: November 9, 2018
Status: Completed

Workshops

Researchers in the planetary and terrestrial aeolian community are at work all over the world; the last workshop alone had representatives from eight countries and three continents! This research is conducted locally on Earth analogs and on such far-flung places as Titan, but the common goal is to understand geological processes on the rocky planets, dwarf planets, asteroids,...

Date published: November 9, 2018
Status: Active

Announcements

Mars Dunes Announcements

Date published: November 9, 2018
Status: Completed

Mars Dunes

Sand dunes are among the most widespread aeolian features present on Mars, serving as unique indicators of the interaction between the atmosphere and surface. On a planetary body, dunes accumulate where a supply of sand-sized grains exists or may be abraded, is carried downwind by winds of saltation strength, and is subsequently deposited where these winds weaken below the...

Date published: October 24, 2018
Status: Active

Aquifer-Storage Change and Land-Surface Elevation Change Monitoring in the Tucson Active Management Area

The Arizona Water Science Center is monitoring aquifer-storage changes and land subsidence within the Tucson Active Management Area (AMA). Land-surface elevation change is monitored at a network of benchmarks throughout the Tucson AMA by measuring changes in land surface elevation over time (approximately annually) with Interferometric Synthetic Aperture Radar (InSAR).  Aquifer-storage change...

Filter Total Items: 61
Date published: February 6, 2018

USGS Surface-water data for Arizona (NWIS-Web)

Access to current conditions, historical observations, daily data, statistics, peak-flow data, and field measurements for streamflow gaging stations in Arizona.

Date published: January 18, 2018

Reanalysis of Selected Archived NURE-HSSR Sediment and Soil Samples from Arizona, California, Idaho, Montana, Nevada, New Mexico, and Utah

Beginning in November of 2015, the U.S. Geological Survey (USGS) undertook a project to reanalyze approximately 60,000 archived sample splits collected as part of the National Uranium Resource Evaluation (NURE) Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) project from selected areas in Arizona, California, Idaho, Montana, Nevada, New Mexico, and Utah. A s

Date published: September 21, 2017

Habitat Data for Arizona Grasshopper Sparrow Territories, Nest Plots, and Random Transects, 2009 to 2013

These data provide information about vegetation structure and composition associated with Arizona Grasshopper Sparrow territories, nest plots, and random transects on two study sites in southeastern Arizona. Data were collected from 2009 through 2013.

Date published: September 1, 2017

National Water Information System web interface (NWISweb)

The National Water Information System (NWIS) web application provides access to real-time and historical surface-water, groundwater, water-quality, and water-use data collected at approximately 1.5 million sites across all 50 states.

Date published: August 25, 2017

Roadside Survey Data from southeastern Arizona and New Mexico for Grasshopper Sparrow and other grassland Birds 2003 to 2005

These data include descriptions of all roadside segments surveyed, including GPS waypoints and verbal descriptions for each point (every half mile), survey data collected on roadside surveys in 2003-2005 in the months of July and August, along roads within the known breeding range of the Arizona Grasshopper Sparrow (Ammodramus savannarum ammolegus).

Date published: July 6, 2017

Life history attributes data for Arizona Grasshopper Sparrow (Ammodramus savannarum ammolegus) in Arizona 2013

The Arizona Grasshopper Sparrow (Ammodramus savannarum ammolegus) occurs in the desert and plains grasslands of southeastern Arizona, southwestern New Mexico, and northern Sonora, Mexico. This data was produced as part of the first intensive study of its life history and breeding ecology, providing baseline data and facilitating comparisons with other North American Grasshopper Sparrow...

Date published: March 7, 2017

Catchment-flowline network and selected model inputs for an enhanced and updated spatially referenced statistical assessment of dissolved-solids load sources and transport in streams of the Upper Colorado River Basin

This USGS data release consists of the synthetic stream network and associated catchments used to develop spatially referenced regressions on watershed attributes (SPARROW) model of dissolved-solids sources and transport in the Upper Colorado River Basin as well as geology and selected Basin Characterization Model (BCM) data used as input to the model.

Date published: January 27, 2017

Mean of the Top Ten Percent of NDVI Values in the Yuma Proving Ground during Monsoon Season, 1986-2011

This study uses growth in vegetation during the monsoon season measured from LANDSAT imagery as a proxy for measured rainfall. NDVI values from 26 years of pre- and post-monsoon season Landsat imagery were derived across Yuma Proving Ground (YPG) in southwestern Arizona, USA.

Date published: January 1, 2017

Digital map of hydrothermal alteration type, key mineral groups, and green vegetation of the northwestern United States derived from automated analysis of ASTER satellite data

Mineral groups identified through automated analysis of remote sensing data acquired by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) were used to generate a map showing the type and spatial distribution of hydrothermal alteration, other exposed mineral groups, and green vegetation across the northwestern conterminous United States. Boolean algebra was used to

Date published: January 1, 2017

USGS Southwest Repeat Photography Collection: Kanab Creek, southern Utah and northern Arizona, 1872-2010

The USGS Southwest Repeat Photography Collection (‘Collection’), formerly named the Desert Laboratory Repeat Photography Collection, is now housed by the Southwest Biological Science Center (SBSC) in Flagstaff, Arizona. It contains images from the late 1800s to mid-2000s, and was assembled over decades by now retired USGS scientists Drs. Robert H. Webb and Raymond

Date published: October 31, 2016

Three GIS datasets defining areas permissive for the occurrence of uranium-bearing, solution-collapse breccia pipes in northern Arizona and southeast Utah

Some of the highest grade uranium (U) deposits in the United States are hosted by solution-collapse breccia pipes in the Grand Canyon region of northern Arizona. These structures are named for their vertical, pipe-like shape and the broken rock (breccia) that fills them. Hundreds, perhaps thousands, of these structures exist. Not all of the breccia pipes are mineralized; only a sm

Date published: August 4, 2016

Prospect- and Mine-Related Features from U.S. Geological Survey 7.5- and 15-Minute Topographic Quadrangle Maps of the Western United States

These data are part of a larger USGS project to develop an updated geospatial database of mines, mineral deposits and mineral regions in the United States. Mine and prospect-related symbols, such as those used to represent prospect pits, mines, adits, dumps, tailings, etc., hereafter referred to as “mine” symbols or features, are currently being digitized on a st

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RPIF Logo
September 24, 2018

The Astrogeology RPIF maintains and distributes a stock of some 60,000 lunar and planetary maps generated since about 1960. The approximately 900 individual maps published since 1961 in the USGS lunar and planetary I-Map/SIM-map series are listed in an Excel spreadsheet (below). Many of these maps are available in hardcopy form at no cost to the requestor. 

RPIF Inventory

A stretch of the Colorado River in the Grand Canyon with rock formations partially covered by clouds. 
January 23, 2017

This web mapping application provides access to many of Grand Canyon Monitoring and Research Center’s most commonly used map layers in support of science efforts occurring throughout the Colorado River corridor.

Figure 6 for Southwestern Willow Flycatcher Habitat Viewer webpage
August 8, 2016

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 for Southwestern Willow Flycatcher Habitat Viewer webpage
August 8, 2016

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.

Figure 3 for Southwestern Willow Flycatcher Habitat Viewer webpage
August 8, 2016

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.

Figure 2 for Southwestern Willow Flycatcher Habitat Viewer webpage
August 8, 2016

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 for Southwestern Willow Flycatcher Habitat Viewer webpage
August 8, 2016

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.

Digital Elevation Model in the Atchafalaya Basin, LA
April 19, 2016

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.

Filter Total Items: 130
Publication Thumbnail
Year Published: 2001

Statistical summary of selected physical, chemical, and toxicity characteristics and estimates of annual constituent loads in urban stormwater, Maricopa County, Arizona

Stormwater and streamflow in Maricopa County were monitored to (1) describe the physical, chemical, and toxicity characteristics of stormwater from areas having different land uses, (2) describe the physical, chemical, and toxicity characteristics of streamflow from areas that receive urban stormwater, and (3) estimate constituent loads in...

Fossum, Kenneth D.; O'Day, Christie M.; Wilson, Barbara J.; Monical, Jim E.
Statistical summary of selected physical, chemical, and toxicity characteristics and estimates of annual constituent loads in urban stormwater, Maricopa County, Arizona; 2001; WRI; 2001-4088; Fossum, Kenneth D.; O'Day, Christie M.; Wilson, Barbara J.; Monical, Jim E.

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Year Published: 2000

Ground-water quality in the upper Santa Cruz Basin, Arizona, 1998

Fifty-eight ground-water samples were collected and analyzed in 1998 by the U.S. Geological Survey and the Arizona Department of Environmental Quality to assess ground-water quality and to identify factors affecting ground-water quality in the Upper Santa Cruz Basin. In addition, pre-existing groundwater quality data for six wells were analyzed to...

Coes, Alissa; Gellenbeck, Dorinda J.; Towne, Douglas C.; Freark, Maureen C.
Ground-water quality in the upper Santa Cruz Basin, Arizona, 1998; 2000; WRI; 2000-4117; Coes, Alissa; Gellenbeck, Dorinda J.; Towne, Douglas C.; Freark, Maureen C.

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Year Published: 2000

Ground-water, surface-water, and water-chemistry data, Black Mesa area, Northeastern Arizona: 1999

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 a precipitation of only about 6 to 12 inches per year. The monitoring program in Black Mesa has been...

Thomas, Blakemore E.; Truini, Margot
Ground-water, surface-water, and water-chemistry data, Black Mesa area, Northeastern Arizona: 1999; 2000; OFR; 2000-453; Thomas, Blakemore E.; Truini, Margot

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Year Published: 2000

Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona: 1998

The Black Mesa monitoring program is designed to document long-term effects of ground-water pumping from the N aquifer by industrial and municipal users. The N aquifer is the major source of water in the 5,400-square-mile Black Mesa area, and the ground water occurs under confined and unconfined conditions. Monitoring activities include continuous...

Truini, Margot; Baum, Bradley M.; Littin, Gregory R.; Shingoitewa-Honanie, Gayl
Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona: 1998; 2000; OFR; 2000-66; Truini, Margot; Baum, Bradley M.; Littin, Gregory R.; Shingoitewa-Honanie, Gayl

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Year Published: 2000

Hydrogeology of the regional aquifer near Flagstaff, Arizona, 1994-97

Sandstones, siltstones, and limestones that are Pennsylvanian to Permian in age underlie the southern part of the Colorado Plateau near Flagstaff, Arizona, and contain a complex regional aquifer that has become increasingly important as a source of water for domestic, municipal, and recreational uses. Ground-water flow in the regional aquifer is...

Bills, Donald J.; Truini, Margot; Flynn, Marilyn E.; Pierce, Herbert A.; Catchings, Rufus D.; Rymer, Michael J.
Hydrogeology of the regional aquifer near Flagstaff, Arizona, 1994-97; 2000; WRI; 2000-4122; Bills, Donald J.; Truini, Margot; Flynn, Marilyn E.; Pierce, Herbert A.; Catchings, Rufus D.; Rymer, Michael J.

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Year Published: 2000

Method to identify wells that yield water that will be replaced by water from the Colorado River downstream from Laguna Dam in Arizona and California

Accounting for the use of Colorado River water is required by the U.S. Supreme Court decree, 1964, Arizona v. California. Water pumped from wells on the flood plain and from certain wells on alluvial slopes outside the flood plain is presumed to be river water and is accounted for as Colorado River water. The accounting-surface method developed...

Owen-Joyce, Sandra J.; Wilson, Richard P.; Carpenter, Michael C.; Fink, James B.
Method to identify wells that yield water that will be replaced by water from the Colorado River downstream from Laguna Dam in Arizona and California; 2000; WRI; 2000-4085; Owen-Joyce, Sandra J.; Wilson, Richard P.; Carpenter, Michael C.; Fink, James B.

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Year Published: 2000

Chemical characteristics of urban stormwater sediments and implications for environmental management, Maricopa County, Arizona

Investigations of the chemical characteristics of urban stormwater sediments in the rapidly growing Phoenix metropolitan area of Maricopa County, Arizona, showed that the inorganic component of these sediments generally reflects geologic background values. Some concentrations of metals were above background values, especially cadmium, copper, lead...

Parker, J.T.C.; Fossum, K.D.; Ingersoll, T.L.
Chemical characteristics of urban stormwater sediments and implications for environmental management, Maricopa County, Arizona; 2000; Article; Journal; Environmental Management; Parker, J. T. C.; Fossum, K. D.; Ingersoll, T. L.

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Year Published: 1999

Monitoring the Effects of Ground-Water Withdrawals from the N Aquifer in the Black Mesa Area, Northeastern Arizona

Littin, Gregory R.
Monitoring the Effects of Ground-Water Withdrawals from the N Aquifer in the Black Mesa Area, Northeastern Arizona; 1999; FS; 064-99; Littin, Gregory R.

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Year Published: 1999

Ground-water quality in the Sierra Vista subbasin, Arizona, 1996-97

Coes, Alissa L.; Gellenbeck, Dorinda J.; Towne, Douglas Clark
Ground-water quality in the Sierra Vista subbasin, Arizona, 1996-97; 1999; WRI; 99-4056; Coes, Alissa L.; Gellenbeck, Dorinda J.; Towne, Douglas Clark

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Year Published: 1999

Hydrogeologic investigations of the Sierra Vista subwatershed of the Upper San Pedro Basin, Cochise County, southeast Arizona

The hydrogeologic system in the Sierra Vista subwatershed of the Upper San Pedro Basin in southeastern Arizona was investigated for the purpose of developing a better understanding of stream-aquifer interactions. The San Pedro River is an intermittent stream that supports a narrow corridor of riparian vegetation. Withdrawal of ground water will...

Pool, Donald R.; Coes, Alissa L.
Hydrogeologic investigations of the Sierra Vista subwatershed of the Upper San Pedro Basin, Cochise County, southeast Arizona; 1999; WRI; 99-4197; Pool, Donald R.; Coes, Alissa L.

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Year Published: 1999

Ground-water quality in alluvial basins that have minimal urban development, south-central Arizona

Ground-water quality data (1917-96) from 772 wells in 16 alluvial basins that have minimal urban development were used to determine the effect of nonurban factors on ground-water quality in south- central Arizona. Characterization of the spatial variability of ground-water quality within and among alluvial basins that have minimal urban...

Gellenbeck, Dorinda J.; Coes, Alissa L.
Ground-water quality in alluvial basins that have minimal urban development, south-central Arizona; 1999; WRI; 99-4005; Gellenbeck, Dorinda J.; Coes, Alissa L.

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Year Published: 1999

Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1997

The Black Mesa monitoring program is designed to document long-term effects of ground-water from the N aquifer by industrial and municipal users. The N aquifer is the major source of water in the 5,400-square-mile Black Mesa area, and the ground water occurs under confined and unconfined conditions. Monitoring activities include continuous and...

Littin, Gregory R.; Baum, Bradley M.; Truini, Margot
Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1997; 1999; OFR; 98-653; Littin, Gregory R.; Baum, Bradley M.; Truini, Margot

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Remote Camera, 30-mile Camp (River MIe 30.7)
September 29, 2018

Remote Camera, 30-mile Camp (River MIe 30.7)

Remote Camera, 30-mile Camp (River MIe 30.7)

September 27, 2018

A USGS guide for finding and interpreting high-water marks (AD)

High-water marks provide valuable data for understanding recent and historical flood events. The proper collection and recording of high-water mark data from perishable and preserved evidence informs flood assessments, research, and water resource management. This video provides guidance for skilled high-water mark identification, including marks left behind in natural and

David Scott(right) and James Irwin(left) in the Lunar Roving Vehicle trainer
September 5, 2018

David Scott and James Irwin in the Lunar Roving Vehicle "Grover"

In preperation for Apollo 15, David Scott and James Irwin trained with a training version of the Lunar Rover known as the "Grover". Apollo 15 was the first mission to bring a rover. This allowed the astronauts to cover a larger distance and explore a larger area. 

A RestoreNet garden with plots covered by white cloth.
August 31, 2018

RestoreNet garden testing seedling establishment.

The RestoreNet gardens test seedlings of priority restoration species across the Southwest. This is a recently installed garden located in the juniper woodlands of the Colorado Plateau. The experiemental network will support land managers by providing insight into various restoration techniques, including testing seedlings vs seeds.

A restoration field trial site on red soils, adjacent to buttes.
August 16, 2018

A RestoreNet Garden on the Colorado Plateau

A completed restoration field trial site just after installation. Half of the site is seeded, and the other half had plants and weed cloth (white fabric) installed. RAMPS will be collecting data on this site for

...
A group of field workers installs an experimental garden.
August 16, 2018

Installing a restoration field trial site

These workers are planting seedlings as part of the restoration field trial network. Each garden in the network is examining seedlings and seeds in conjunction with restoration treatments to better understand how

...
Bare ground with 2x2 meter square plots of various restoration treatments.
August 16, 2018

Seeding treatment experiment

View of a recently installed Restoration Field Trial Network site in the rangelands of Northern Arizona. This part of the site contains the seeding treatments: mulch, ConMods (metal crosses), pits, and two

...
June 30, 2018

Understanding Floods | Long-term Streamflow Data Collection (AD)

The USGS is developing methods to improve data collection during floods to gain new insight into the rise and fall of flood waters. In the past, the only data left behind after a flood was how high the water got, or the peak of the flood. This video presents the methodology that hydrologists are using to set up a Continuous Slope-area Reach in remote areas that are

June 30, 2018

Understanding Floods | Long-term Streamflow Data Collection

The USGS is developing methods to improve data collection during floods to gain new insight into the rise and fall of flood waters. In the past, the only data left behind after a flood was how high the water got, or the peak of the flood. This video presents the methodology that hydrologists are using to set up a Continuous Slope-area Reach in remote areas that are

May 11, 2018

Image of the Week - Rattlesnake Fire, AZ

Landsat and Sentinel sensors capture the Rattlesnake Fire as it burns in Arizona.

At the USGS EROS Center, we study land change, operate the Landsat satellites, and maintain the longest, continuously acquired collection of images of the Earth's land surface.

USGS EROS Center (https://eros.usgs.gov/)

May 8, 2018

Advances in Streamgaging | Reach-Scale Monitoring Experiment (2 of 2)

In this second installment of a two part series, The Arizona Water Science Center, in partnership with the USDA Agricultural Research Service, reviews the results of an experiment to verify remote methods that measure flood flows at the Walnut Gulch Experimental Watershed. What makes this experiment unique are the super-critical runoff flumes that precisely measure

Satellite image of the fire in Arizona.
May 1, 2018

Rattlesnake Fire, Arizona

The 2018 fire season is already active in the western United States. One of the larger wildfires so far is the Rattlesnake Fire. 

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A wildfire in a forest
September 7, 2017

A growing number of wildfire-burned areas throughout the western United States are expected to increase soil erosion rates within watersheds, causing more sediment to be present in downstream rivers and reservoirs, according to a new study by the U.S. Geological Survey.

Image: Burning Sagebrush
September 6, 2017

An examination of long-term data for lands managed by the Bureau of Land Management finds that land treatments in the southwestern United States are increasingly large, expensive and related to fire and invasive species control.

Full-Circle Vista from Naukluft Plateau on Mars
July 3, 2017

Billions of dollars and a decade worth of research are on the line in the instant that a spacecraft touches down on Mars. When deciding where to land on the planet’s rocky surface, it is essential to analyze potential landing sites and their surface characteristics.

An extremely rare Mojave River western pond turtle was recently observed in the Mojave Desert.
May 23, 2017

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

Three-dimensional view of the west Ceti Mensa area looking toward the southeast.
May 12, 2017

A new set of high-resolution geologic maps reveal complex geologic processes that suggest a dynamic, wet environment once existed on early Mars, according to the U.S. Geological Survey.

A radio-tracked adult desert tortoise basks in the sun among the wind turbines at a wind energy facility
May 3, 2017

How a wind energy facility is designed can influence the behavior of animal predators and their prey, according to a recent study published in The Journal of Wildlife Management by researchers at the University of California, Davis, and the U.S. Geological Survey.

Image shows a map of U.S. states colored based on the value of their mineral industry
April 14, 2017

In 2016, these five states led the pack in mineral production, accounting for about one third of the total mineral production value for the entire country.

Santa Cruz River
March 27, 2017

Desert communities throughout the Southwest are putting water availability at the top of their municipal agendas.

View from Canyonlands Research Center
March 15, 2017

Arid and semiarid ecosystems are expected to experience significant changes in temperature and precipitation patterns, which may affect soil organisms in ways that cause surfaces to become lighter in color and thus reflect more sunlight, according to a new U.S. Geological Survey study.

Lake Mead
March 15, 2017

The Colorado River system provides about 35 million Americans with a portion of their water supply. It irrigates 5½ million acres of land in the West and provides water to tribes, parks, and wildlife. The system serves parts of seven States and Mexico—but reservoir levels have crept lower over the past several years, sparking questions about how much water remains and who will have access.

Photo of Pigeon Canyon just before it merges with Snake Gulch in northern Arizona. 
January 24, 2017

Uranium levels in Pigeon Spring, just north of the Grand Canyon, are likely due to a natural source of uranium and not related to the nearby former Pigeon Mine, according to a recent study by the U.S. Geological Survey.

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