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.

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Filter Total Items: 142
Date published: April 12, 2017
Status: Active

Hydrocarbon Monitoring in Response to Personal Watercraft Regulation at Glen Canyon National Recreation Area

Polycyclic aromatic hydrocarbon (PAH) contamination related to watercraft use is one of the most significant water-quality issues affecting Lake Powell at Glen Canyon National Recreation Area (GLCA). Water quality in Lake Powell is important as the lake is a water source for public and agricultural consumption. In addition, more than 2 million people visit GLCA annually, and most of these...

Date published: April 12, 2017
Status: Active

Identification and Analysis of Points of Diversion along the Lower Colorado River in Support of Decree Accounting

 In the United States, the Colorado River Compact of 1922 apportions the waters of the Colorado River between the upper basin States and the lower basin States (U.S. Congress, 1948, p. A17-A22). The requirement for participation of the U.S. Geological Survey (USGS) and the Bureau of Reclamation (BOR) is stated in Article V. Water in the lower Colorado River is apportioned among the States of...

Date published: April 10, 2017
Status: Active

Spatial and Temporal Distribution of Bacterial Indicators and Microbial Source Tracking within Tumacácori National Historical Park and the Santa Cruz River Watershed

Elevated levels of bacteria have been measured by the USGS, National Park Service, Arizona Department of Environmental Quality (ADEQ), and other agencies, in the Upper Santa Cruz River, including within the reach at Tumacácori National Historical Park (TUMA).  Indicators of pathogens in the river at TUMA are at levels that are of great concern to TUMA personnel responsible for safeguarding two...

Date published: April 10, 2017
Status: Active

Occurrence, fate, transport, and ecological effects of aerially applied herbicides in the effort to control invasive buffelgrass (Pennisetum ciliare syn. Cenchrus ciliaris) in Saguaro National Park

The Sonoran Desert lands that the Saguaro National Park (SAGU) has been tasked to protect are facing an unprecedented threat from buffelgrass (Cenhrus ciliaris), an invasive perennial grass that was added to Arizona’s noxious weed list in 2005. The buffelgrass invasion has been so pervasive that the U.S. Department of Interior issued a declaration in 2010 which highlighted a need for...

Date published: March 29, 2017
Status: Active

C Aquifer Monitoring Program

The Navajo Nation, the City of Flagstaff (COF), and the U.S. Geological Survey (USGS) maintain a cooperative monitoring program with other local and State agencies for groundwater in the C aquifer (Coconino aquifer) in the Little Colorado River Basin. The goal of this program is to determine baseline groundwater conditions in the C aquifer and other water-bearing zones before significant...

Date published: March 15, 2017
Status: Active

Black Mesa Monitoring Program

The U.S. Geological Survey water-monitoring program in the Black Mesa area began in 1971 and provides information about the long-term effects of groundwater withdrawals from the N aquifer for industrial and municipal uses. The monitoring program includes measuring potential recovery in the N aquifer as a result of the reduction in industrial pumpage by Peabody Western Coal Company.

Date published: March 14, 2017
Status: Active

Maricopa County Urban Stormwater Quality

Since 1991, the U.S. Geological Survey (USGS), in cooperation with the Flood Control District of Maricopa County (FCDMC), the city of Phoenix, and the city of Glendale, has been collecting, analyzing, and interpreting urban stormwater information from selected basins throughout the metropolitan Phoenix area. Water-resource managers and policy makers have used this information to determine...

Contacts: Kenneth Fossum
Date published: March 9, 2017
Status: Active

Air Force Plant 44

Industrial activity at Air Force Plant 44 (AFP 44), a manufacturing facility located on property owned by the U.S. Air Force and operated by a major defense contractor, resulted in extensive contamination of groundwater with the industrial solvent trichloroethylene (TCE) and other organic compounds. The sole-source regional aquifer underlying AFP 44 provides potable water for municipal,...

Date published: March 9, 2017
Status: Active

Arizona Water Use

The Arizona Water Use program collects and estimates annual water withdrawals for the categories of irrigation, municipal, mining, thermoelectric-power, and drainage uses. The data for these categories are compiled for the Arizona Department of Water Resources groundwater basins outside of Active Management Areas. 

Contacts: Saeid Tadayon
Date published: February 28, 2017
Status: Active

USGS Data at Risk: Expanding Legacy Data Inventory and Preservation Strategies

As one of the largest and oldest science organizations in the world, USGS has produced more than a century of earth science data, much of which is currently unavailable to the greater scientific community due to inaccessible or obsolescent media, formats, and technology. Tapping this vast wealth of “dark data” requires 1) a complete inventory of legacy data and 2) methods and tools to...

Contacts: Lance Everette, Tara M Bell, Cristiana Falvo
Date published: January 17, 2017

Ecological Drought in Riparian Ecosystems

Drought is killing riparian trees along many rivers in the western United States. The cause can be increasing temperature or decreasing precipitation, flow or water-table elevation. At multiple locations we are relating water availability to physiological measurements of tree survival and water stress, such as ring width, carbon stable isotope ratio and branch hydraulic conductivity. These...

Date published: December 9, 2016
Status: Active

RAMPS: Restoration Assessment & Monitoring Program for the Southwest

The Restoration Assessment and Monitoring Program for the Southwest (RAMPS) seeks to assist U.S. Department of the Interior (DOI) and other land management agencies in developing successful techniques for improving land condition in dryland ecosystems of the southwestern United States. Invasion by non-native species, wildfire, drought, and other disturbances are growing...

Filter Total Items: 130
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Year Published: 1984

A method for estimating ground-water return flow to the Colorado River in the Parker area, Arizona and California

Leake, S.A.
A method for estimating ground-water return flow to the Colorado River in the Parker area, Arizona and California; 1984; WRI; 84-4229; Leake, S. A.

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Year Published: 1984

Annual summary of ground-water conditions in Arizona, spring 1982 to spring 1983

The withdrawal of ground water was slightly less than 4.2 million acre-feet in Arizona in 1982, which is about 1.2 million acre-feet less than the amount withdrawn in 1981. Most of the decrease in 1982 was in the amount of ground water used for irrigation in the Basin and Range lowlands province. Through 1982, slightly more than 193 million acre-...

Annual summary of ground-water conditions in Arizona, spring 1982 to spring 1983; 1984; OFR; 84-428; Geological Survey (U.S.)

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Year Published: 1983

A method for estimating ground-water return flow to the lower Colorado River in the Yuma area, Arizona and California

Loeltz, Omar J.; Leake, S.A.
A method for estimating ground-water return flow to the lower Colorado River in the Yuma area, Arizona and California; 1983; WRI; 83-4220; Loeltz, O. J.; Leake, S. A.

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Year Published: 1983

A method for estimating ground-water return flow to the lower Colorado River in the Yuma area, Arizona and California; executive summary

Loeltz, Omar J.; Leake, S.A.
A method for estimating ground-water return flow to the lower Colorado River in the Yuma area, Arizona and California; executive summary; 1983; WRI; 83-4221; Loeltz, O. J.; Leake, S. A.

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Year Published: 1983

Geohydrology and effects of water use in the Black Mesa area, Navajo and Hopi Indian Reservations, Arizona

The N aquifer is the main source of water in the 5,400-square-mile Black Mesa area in the Navajo and Hopi Indian Reservations in northeastern Arizona. The N aquifer consists of the Navajo Sandstone and parts of the underlying Kayenta Formation and Wingate Sandstone of Jurassic and Triassic age. Maximum saturated thickness of the aquifer is about 1...

Eychaner, James H.
Geohydrology and effects of water use in the Black Mesa area, Navajo and Hopi Indian Reservations, Arizona; 1983; WSP; 2201; Eychaner, James H.

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Year Published: 1982

Annual summary of ground-water conditions in Arizona, Spring 1981 to Spring 1982

The withdrawal of ground water was about 5.4 million acre-feet in Arizona in 1981, which is about 800,000 acre-feet more than the amount withdrawn in 1980. Most of the increase in 1981 was in the amount of ground water used for irrigation in the Basin and Range lowlands province. Through 1981, slightly more than 189 million acre-feet of ground...

Annual summary of ground-water conditions in Arizona, Spring 1981 to Spring 1982; 1982; OFR; 82-1009; Geological Survey (U.S.)

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Year Published: 1982

Shallow subsurface temperatures and some estimates of heat flow from the Colorado Plateau of northeastern Arizona

Temperature data to depths of a few hundred meters were obtained from 29 wells in northeastern Arizona; 12 in the region surrounding the San Francisco Volcanic Field, 8 in the Black Mesa area, and 9 in the south-central Colorado Plateau which includes the White Mountains. Although there was evidence for local hydrologic disturbances in many...

Sass, J.H.; Stone, Claudia; Bills, D.J.
Shallow subsurface temperatures and some estimates of heat flow from the Colorado Plateau of northeastern Arizona; 1982; OFR; 82-994; Sass, J. H.; Stone, Claudia; Bills, D. J.

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Year Published: 1981

Annual summary of ground-water conditions in Arizona, spring 1979 to spring 1980

Withdrawal of ground water, about 4.0 million acre-feet in Arizona in 1979, is about 200,000 acre-feet less than the amount withdrawn in 1978. The withdrawals in 1978 and 1979 are the smallest since the mid-1950 's except in 1966. Nearly all the decrease was in the amount of ground water used for irrigation in the Basin and Range lowlands province...

Annual summary of ground-water conditions in Arizona, spring 1979 to spring 1980; 1981; OFR; 81-906; Geological Survey (U.S.)

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Year Published: 1981

Geohydrology and effects of water use in the Black Mesa area, Navajo and Hopi Indian Reservations, Arizona

The main source of water in the 5,400-square-mile Black Mesa area is the N aquifer, which consists of the Navajo Sandstone and underlying Kayenta Formation and Wingate Sandstone. Water is under confined conditions in the central 3,300 square miles. Transmissivity is less than 1,000 feet squared per day. Storage coefficient is less than 0.0004 in...

Eychaner, James H.
Geohydrology and effects of water use in the Black Mesa area, Navajo and Hopi Indian Reservations, Arizona; 1981; OFR; 81-911; Eychaner, James H.

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Year Published: 1981

Maps Showing Ground-Water Conditions in the San Francisco Peaks Area, Coconino County, Arizona - 1979

INTRODUCTION The San Francisco Peaks area includes about 2,300 mi2, of which about 500 mi2 is in the Navajo Indian Reservation, in north-central Arizona. Ground-water development has been slight except for the public-supply wells for Flagstaff and domestic wells in Fort Valley, Pitman Valley, and the area west of Elden Mountain. The public...

Appel, Cynthia L.; Bills, Donald J.
Maps Showing Ground-Water Conditions in the San Francisco Peaks Area, Coconino County, Arizona - 1979; 1981; OFR; 81-914; Appel, Cynthia L.; Bills, Donald J.

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Year Published: 1980

Annual summary of ground-water conditions in Arizona, spring 1978 to spring 1979

In 1978 the withdrawal of ground water was about 4.2 million acre-feet in Arizona, and slightly more than 3.4 million acre-feet of ground water was used for the irrigation of crops. The amount of ground water withdrawn in 1978 decreased more than 1.2 million acre-feet from the amount withdrawn in 1977 and is the smallest amount withdrawn since the...

Annual summary of ground-water conditions in Arizona, spring 1978 to spring 1979; 1980; OFR; 80-330; Geological Survey (U.S.)

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Year Published: 1980

Map showing ground-water conditions in the Canyon Diablo area, Coconino and Navajo Counties, Arizona - 1979

The Canyon Diablo area includes about 1,400 square miles in northeastern Arizona. The main source of ground water is the Coconino aquifer, which includes the Kaibab Limestone, the Cononino Sandstone, and the upper member of the Supai Formation. In places the alluvium and volcanic rocks yield water to wells and springs. Information on the map...

Appel, Cynthia L.; Bills, Donald J.
Map showing ground-water conditions in the Canyon Diablo area, Coconino and Navajo Counties, Arizona - 1979; 1980; OFR; 80-747; Appel, Cynthia L.; Bills, Donald J.

Filter Total Items: 243
October 5, 2013

Animal Interactions at Wind Energy Facilities – Western Spotted Skunk

There was one documented skunk event captured on camera - the least documented predator. Here, a western spotted skunk is thoroughly investigating the burrow of one of the marked female tortoises in the study population. Western spotted skunks are known predators of turtle eggs. The skunk investigated the area within the burrow for a full minute before it appears outside

August 7, 2013

TESNAR Program: CSAs

TESNAR stands for the Technical training in Support of Native American Relations, and is a program run by the USGS to foster cooperation between tribes and the USGS by providing them with the tools and training to manage their tribal resources, such as water. As shown here, training in the Continuous Slope Area Method can help tribes a great deal, by providing data when

Image: Burned Area Near Yarnell, Arizona
July 19, 2013

Burned Area Near Yarnell, Arizona

Burned area within the Yarnell Hill Fire near Yarnell Arizona.

Attribution: Natural Hazards
June 30, 2013

Animal Interactions at Wind Energy Facilities – Bobcat

In this video, a bobcat approached a desert tortoise (a marked female in the study population) that was sleeping on the apron of her burrow. Bobcats are known predators of various life stages of the desert tortoise. In this case, the bobcat bent down to sniff the tortoise, and then touched its paw to the top of the tortoise's shell. The tortoise then moved into an "all-

June 26, 2013

Earth.Science.Art Project

This collaborative project pairs artists from California's Central Coast and San Francisco Bay Area with scientists from the Santa Cruz-based U.S. Geological Survey's Pacific Marine and Coastal Science Center. The artist create work inspired by scientific research.

June 22, 2013

Animal Interactions at Wind Energy Facilities – American Black Bear

This American black bear and cub duo was seen simply investigating a tortoise burrow, and although it is surprising to see a black bear so low in elevation, it isn't impossible. The study site, Mesa, sits at the intersection of multiple ecosystems (Sonoran Desert, Mojave Desert, montane, and coastal sage scrub). Therefore, the bears could have come down from the montane

June 22, 2013

Animal Interactions at Wind Energy Facilities – Coyotes

Coyotes were the second most frequently observed mammalian predator on the trail cameras. Coyotes are considered one of the primary predators of desert tortoises. In this instance, a coyote is passing by a burrow when it suddenly has a change in attention as it is passing by. It then approaches the burrow and sniffs all around the burrow entrance (including the apron and

USGS and US Forest Service staff installing dust monitoring equipment at a uranium mine near Grand Canyon National Park.
May 31, 2013

USGS and US Forest Service staff installing dust monitoring equipment

USGS and US Forest Service staff installing dust monitoring equipment at a uranium mine near Grand Canyon National Park.

Climate change combined with overlapping high-intensity land uses are likely to create conditions detrimental to the recreation economy, wildlife habitat, water availability and other resources in hyper-arid landscapes, or drylands, in the future

...
Bureau of Land Management truck sprays herbicide in southwestern Idaho as part of a restoration effort. 
December 31, 2012

Truck sprays herbicide in Idaho as part of a restoration effort.

Bureau of Land Management truck sprays herbicide in southwestern Idaho as part of a restoration effort. 

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.

December 11, 2012

Streamflow Gaging Station and Measurement on San Pedro River, AZ

USGS employee, Hanna Coy, talks about stream gauging.

A photo of a female mountain bluebird with mistletoe.
November 28, 2012

WERC Mountain Bluebird Eating Mistletoe Berry

A mountain bluebird eats a giant mistletoe berry in an ash tree in Sedona, Arizona (Oak Creek).  These bluebirds, and many other types of birds, rely on mistletoe berries for sustenance. As a result, they also help distribute the mistletoe seeds.

Image: Sandbar growth Grand Canyon following controlled flood
October 31, 2012

Sandbar growth Grand Canyon following controlled flood

Picture showing the increased size of the sandbar after the November 2012 controlled flood from the Glen Canyon Dam. This location is 65 miles downstream from Lees Ferry and the view is looking downstream. These and additional photographs depicting the results of the recent controlled floods can be viewed online.

 

Filter Total Items: 200
USGS science for a changing world logo
October 12, 2011

A dust storm that rolled across the Arizona desert on Tuesday, October 4, 2011, effectively blinded motorists, leading to a large string of motor vehicle crashes, multiple injuries, and at least one death. 

USGS science for a changing world logo
September 21, 2011

Over the last 70 years, groundwater in Arizona's alluvial basins was depleted by more than 74.5 million acre-feet, or approximately three times the maximum storage of Lake Powell. 

USGS science for a changing world logo
August 25, 2011

To help Arizona communities prepare for flooding in the aftermath of severe wildfires, the U.S. Geological Survey has installed new stream gages as part of early flood-warning systems and developed maps to identify areas at possible risk of debris flows.

USGS science for a changing world logo
June 17, 2011

As the largest fire in the history of the state of Arizona continues to burn, emergency managers and responders are using satellite data from a variety of instruments to plan both immediate firefighting containment strategies and mitigation efforts once the fires are out.

USGS science for a changing world logo
June 9, 2011

The second largest fire in Arizona history, the Wallow Fire is graphically depicted by this Landsat image, taken June 7, which shows burning in the mountains of eastern Arizona near the border with New Mexico.

USGS science for a changing world logo
May 13, 2011

Recent Landsat satellite data captured by the U.S. Geological Survey and NASA on May 10 show the major flooding of the Mississippi River around Memphis, Tenn. and along the state borders of Tennessee, Kentucky, Missouri, and Arkansas as seen from 438 miles above the Earth.

USGS science for a changing world logo
April 12, 2011

A new groundwater model of the interconnected aquifers in central and northern Arizona was released today by the U.S. Geological Survey, following a multi-year development effort that involved the Arizona Department of Water Resources and regional cooperators.

USGS science for a changing world logo
February 15, 2011

Forests should be managed according to their respective, specific fire ecology — not whole-scale fire suppression or one-size-fits-all plans — to optimize forest growth and stabilize carbon storage.

USGS science for a changing world logo
February 15, 2011

Forests should be managed according to their respective, specific fire ecology — not whole-scale fire suppression or one-size-fits-all plans — to optimize forest growth and stabilize carbon storage.

USGS
December 12, 2010

The U.S. Geological Survey (USGS) is celebrating the success of three distinguished researchers who are recipients of the Presidential Early Career Award for Scientists and Engineers (PECASE). This award is the highest recognition granted by the United States government to scientists and engineers in the early stages of their research careers.

USGS
December 2, 2010

TUCSON, Ariz. -- A new book on the methods and applications of repeat photography that showcases its international usage in monitoring landscape change on five continents has been released. 

USGS
November 15, 2010

FLAGSTAFF, Ariz. — The U.S. Geological Survey has named Kate Kitchell the director of its Southwest Biological Science Center. Kitchell, who served as the acting center director for the previous 16 months, assumed the role permanently November 6, 2010.