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: 138
Date published: July 5, 2016
Status: Active

Economic Impacts of Ecological Restoration

Federal investments in ecosystem restoration projects protect Federal trusts, ensure public health and safety, and preserve and enhance essential ecosystem services. These investments also generate business activity and create jobs. However, limited information exists on the costs and associated economic impacts of ecosystem restoration projects due to the complexity of the “restoration...

Date published: July 1, 2016
Status: Active

Surveillance for the Presence of White-Nose Syndrome in the Bat Community at El Malpais National Monument, New Mexico

In 1999 and 2000, FORT conducted a survey of bats at El Malpais National Monument and adjacent lands. During this study, several species of bats were documented, including some that are known to use caves or lava-tube formations as roosts. In the winter of 2006–2007, the fungus-caused disease known as “white-nose syndrome” (WNS) began devastating populations of hibernating bat species that use...

Date published: July 1, 2016

Assessing Impacts to Ecosystems from Uranium Mining in the Grand Canyon Region

The use of uranium is an alternative energy source to petroleum products and some of the United States’ highest quality ore is located on the Colorado Plateau. However, some regions where suitable mining efforts are conducted include areas that are near important environmental resources such as National Parks that provide viewscapes and habitat for wildlife.

Date published: March 17, 2016

Volcano Hazards Assessments Help Mitigate Disasters

The Volcano Hazards Program develops long-range volcano hazards assessments. These includes a summary of the specific hazards, their impact areas, and a map showing ground-hazard zones. The assessments are also critical for planning long-term land-use and effective emergency-response measures, especially when a volcano begins to show signs of unrest.

Date published: March 3, 2016
Status: Completed

Developing a USGS Legacy Data Inventory to Preserve and Release Historical USGS Data

Legacy data (n) - Information stored in an old or obsolete format or computer system that is, therefore, difficult to access or process. (Business Dictionary, 2016) For over 135 years, the U.S. Geological Survey has collected diverse information about the natural world and how it interacts with society. Much of this legacy information is one-of-a-kind and in danger of being lost forever...

Date published: June 13, 2015
Status: Active

Transboundary Aquifer Assessment Program (TAAP)

Transboundary aquifers are an essential source of water for United States – Mexico border communities. Declining water levels, deteriorating water quality, and increasing use of groundwater resources on both sides of the border raise concerns about the long-term availability of this supply.

The U.S. – Mexico Transboundary Aquifer Assessment Act (Public Law 109-448) of 2006 was enacted...

Filter Total Items: 226
Image: Mine Blast at Silver Bell Mine, Arizona
January 1, 2010

Mine Blast at Silver Bell Mine, Arizona

Mine Blast at Silver Bell Mine, Arizona.

The former Pigeon Mine in northern Arizona is seen here looking towards the northeast.
December 31, 2009

The former Pigeon Mine in northern Arizona

The former Pigeon Mine in northern Arizona is seen here looking towards the northeast.

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 USGS.

Photo of Pigeon Canyon just before it merges with Snake Gulch in northern Arizona. 
December 31, 2009

Pigeon Canyon in northern Arizona

Here, Pigeon Spring emerges in Pigeon Canyon just before it merges with Snake Gulch in northern Arizona. 

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 USGS.

A photo of a distressed desert of the Sonoran Desert
October 27, 2009

The Sonoran Desert of the Barry M. Goldwater Range in Arizona

A distressed desert in the Sonoran Desert of the Barry M. Goldwater Range in Arizona

Image: Boundary Monument 75E, Southeastern Arizona - 2009
April 24, 2009

Boundary Monument 75E, Southeastern Arizona - 2009

An anti-vehicle barricade has been constructed across this section of the international boundary. Grass cover has increased in the foreground, providing evidence of the site’s grassland connection. (Raymond M. Turner)

Attribution: Land Resources
Photo of a female silky flycatcher with mistletoe berry.
April 1, 2009

WERC A Silky Flycatcher with a Mistletoe Berry

A female silky flycatcher with a mistletoe berry in her beak. These flycatchers are intimately tied to mistletoe. They build their beautiful cup nests (much like a large hummingbird nest) within the mistletoe, or nearby. The young hatch during February when the mistletoe may be in flower and supply a rich source of insect nutrients for growing young. The rest of the year,

...
A very close-up photo of sand grains from the Grand Canyon River, with a centimeter scale drawn on top.
December 31, 2008

Grand Canyon sand

Grand Canyon sand was photographed with a hand-held point-and-shoot camera in a waterproof housing.

August 27, 2008

Havasu Creek Flood Damage (2008)

USGS staff evaluates flood damage caused by the recent Havasu Creek Flood, August 2008.

July 12, 2008

Streamflow Measurement (2008)

USGS streamgagers make a discharge measurement in southwest Arizona.

July 11, 2008

Flood Measurement in Tucson, AZ (2008)

Footage of USGS streamgagers taking measurements on the Santa Cruz River in Arizona.

June 22, 2008

Streamflow Measurement (San Pedro River - 2008)

USGS streamgagers make a low flow measurement on the San Pedro River at Charleston.

View of sandbar on Colorado River at River Mile 65
May 24, 2008

View of sandbar on Colorado River at River Mile 65

View of reattachment sandbar located near the Carbon Creek drainage on Colorado River (River Mile 65).  Photo is from the long-term sandbar monitoring remote camera time-series archives, and shows the sandbar two months after the 2008 Spring High Flow Event.

Filter Total Items: 190
USGS
February 25, 2008

The Department of the Interior has proposed an experiment using high flows from Glen Canyon Dam to study and improve Colorado River resources in Grand Canyon National Park.

USGS
January 30, 2008

Where in Arizona are ground-water levels falling? Where are they stable or rising? How much has the water table changed since large-scale pumping has occurred? 

USGS
January 17, 2008

(Flagstaff, Ariz.) An experiment using high flows from Glen Canyon Dam to study and improve Colorado River resources in Grand Canyon National Park has been proposed by the Department of the Interior.

USGS
September 24, 2007

The U.S. Geological Survey (USGS) released a report today describing salinity levels in streams and ground water in parts of Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming. The report concludes that although salinity varies widely throughout the region, levels have generally decreased in many streams during the past two decades.

USGS
March 22, 2007

The U.S. Geological Survey hosted a two-day scientific workshop that drew state and federal government scientists, and university researchers together to discuss interdisciplinary research along the US-Mexico border. 

USGS
October 20, 2006

The U.S. Geological Survey (USGS) has recently released a new fact sheet/report describing investigations that have taken place in Lake Mead, Nevada and Arizona, on synthetic organic compounds. 

USGS science for a changing world logo
October 20, 2006

The U.S. Geological Survey (USGS) has recently released a new fact sheet/report describing investigations that have taken place in Lake Mead, Nevada and Arizona, on synthetic organic compounds. These compounds potentially can cause endocrine disruption in common carp.

USGS science for a changing world logo
August 6, 2006

Recently collected data for endangered humpback chub (Gila cypha) in Grand Canyon suggest that the population of adult fish (age 4+) may be stabilizing after more than a decade of decline, according to biologists with the U.S. Geological Survey's (USGS) Southwest Biological Science Center. 

USGS
August 3, 2006

Recently collected data for endangered humpback chub (Gila cypha) in Grand Canyon suggest that the population of adult fish (age 4+) may be stabilizing after more than a decade of decline, according to biologists with the U.S. Geological Survey's (USGS) Southwest Biological Science Center.

USGS
June 5, 2006

Today, June 5, 2006, the U.S. Geological Survey (USGS) announces the recipients of the third year of the Mineral Resources External Research Program, a grant and/or cooperative agreement opportunity designed to support minerals research. 

USGS
May 4, 2006

One of every four fishes in streams of 12 western states is non-native, according to a U.S. Geological Survey (USGS) study published in November 2005 in the North American Journal of Fisheries Management. And, researchers found, it´s not just that there are a lot of non-native fishes but they are also widespread...

USGS science for a changing world logo
May 4, 2006

One of every four fishes in streams of 12 western states is non-native, according to a U.S. Geological Survey (USGS) study published in November 2005 in the North American Journal of Fisheries Management.