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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Image: Dust Storm Near Winslow, Arizona, in April 2011
April 1, 2011

Dust Storm Near Winslow, Arizona, in April 2011

Dust carried by the wind has far-reaching effects, including the loss of nutrients and water-holding capacity from landscapes, and the speeding up of the melting of snow, which affects the timing and magnitude of runoff into streams and rivers.

Attribution: Land Resources
Image: Dust Storm near Winslow, Arizona, in April  2011
April 1, 2011

Dust Storm near Winslow, Arizona, in April 2011

Dust carried by the wind has far-reaching effects, including the loss of nutrients and water-holding capacity from landscapes, and the speeding up of the melting of snow, which affects the timing and magnitude of runoff into streams and rivers.

Attribution: Water Resources
March 10, 2011

Seepage Investigation: Clear Creek and Little Colorado River

Stream gaging occurring in Winslow: Clear Creek and Little Colorado River.

September 8, 2010

Grand Falls

Flooding taking place at Grand falls.

Image: Smoke From Schultz Pass Forest Fire, Flagstaff, Arizona, June 20, 2010
June 20, 2010

Smoke From Schultz Pass Forest Fire, Flagstaff, Arizona, June 20, 2010

Panorama (180 degree field of view) photograph of smoke rising from the Schultz Pass fire near Flagstaff, Arizona, at 1:34 p.m. on its day of ignition, June 20, 2010.  Over the following 10 days, the fire burned an estimated 15,075 acres, or more than 23 square miles of northern Arizona forest, and cost more than $8.6 million to fight. The fire was started by a campfire

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Attribution: Natural Hazards
Image: Grand Canyon Investigations: 131 Years in the Field
April 12, 2010

Grand Canyon Investigations: 131 Years in the Field

Staff at the USGS Central Region Library created two displays for an open-house in celebration of National Library Week, April, 2010. This display on USGS scientific investigtations of the Grand Canyon displays field records, historical photography,historical surveying equipment, and publications from the science areas of biology, geology, geography, and water.

Image: Saguaro National Park, East Unit, Southern Arizona - 2010
March 29, 2010

Saguaro National Park, East Unit, Southern Arizona - 2010

Saguaro National Monument is now Saguaro National Park. The decline is saguaros has continued but at a rate slightly less steep than predicted. Very few of the saguaro present in 1935 remain. Meanwhile, the regeneration of this forest has already begun, as shown by findings from a long-term study-plot located at left midground. There has been a sharp increase in

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Attribution: Land Resources
March 21, 2010

Explaining Flood Measurements

Explaning why USGS streamgagers make discharge measurements.

March 21, 2010

Measuring Low Flow in San Pedro River

Measuring low flow in the San Pedro River with flume.

January 27, 2010

Streamflow Measurement, Pinto Creek, AZ (Jan 2010)

USGS streamgagers, Mike Sanders, Arthur Rees, and Mike Schilling, are servicing the Pinto Creek near Miami, Arizona streamflow gaging station and making a streamflow measurement on January 28, 2010. Flow was measured to be 207 cubic feet per second (CFS) on the 28th but peaked earlier on the 22nd at an estimated 7,400 cfs. Debris from the flood flow can be seen in trees

January 21, 2010

USGS Measurement, Salt River (January 2010 )

USGS streamgagers, Mike Sanders and Henry Sanger are servicing the, Salt River near Roosevelt, Arizona streamflow gaging station and making a streamflow measurement on January 22, 2010. Flow was measured to be 44,500 cubic feet per second (CFS) on the 22th but peaked earlier on the 22nd at an estimated 88,000 cfs. The measurement was made from the cableway just downstream

January 21, 2010

Streamflow Measurement, Rillito Creek AZ (Jan 2010)

USGS employees, John Hoffmann, Corey Salmond, Robert Fritzinger, and Chris Smith are being interviewed by Naomi Pescovitz from KVOA on January 22, 2010. Robert Fritzinger and Corey Salmond are making a streamflow measurement at Rillito Creek at La Cholla BLVD near Tucson streamflow gaging station. The updated peak was 1,360 cubic feet per second (CFS) on January 22, 2010.

Filter Total Items: 202
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.