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: 226
Image: Sandbar on the Colorado River in Grand Canyon
May 23, 2008

Sandbar on the Colorado River in Grand Canyon

Sandbar on the Colorado River in Grand Canyon deposited by 2008 controlled flood. The river is flowing from left to right and the location is approximately 64 miles downstream from Lees Ferry, Arizona.

Image: Sandbar on the Colorado River in Grand Canyon
May 23, 2008

Sandbar on the Colorado River in Grand Canyon

Sandbar on the Colorado River in Grand Canyon deposited by the 2008 controlled flood. The view is looking downstream and the location is approximately 65 miles downstream from Lees Ferry, Arizona.

 

August 31, 2007

Monsoon-Rain Flow in an Ephemeral Channel near Sierra Vista, Arizona

As part of the assessment of the binational San Pedro aquifer, the effects of urbanization on runoff in ephemeral streams was studied. Ephemeral streams are those that flow in response to precipitation. Runoff in tributaries to the San Pedro River is important in understanding the water budget of the river. In addition, in arid watersheds such as the San Pedro, flow in

June 28, 2007

PubTalk 6/2007 — Adventures in Southwest Geology

Exploring the colorful southern Colorado Plateau in 3-D

By Philip Stoffer, Geologist

Take a colorful tour with the help of 3-D photography through some of the region's highlights:

  • A plethora of parklands- Petrified Forest, Chaco Canyon, Wupatki, Grand Canyon
  • High desert climate changes, past, present, and
Drilling for mineral resources near Canyonlands National Park, Utah
May 31, 2007

Drilling for mineral resources near Canyonlands National Park, Utah

Drilling for mineral resources near Canyonlands National Park, Utah

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, according to a paper published in Ecosphere

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Image: Huérfano Butte, Santa Rita Experimental Range, Southern Arizona - 2007
March 1, 2007

Huérfano Butte, Santa Rita Experimental Range, Southern Arizona - 2007

More mesquite were visible, and prickly pear had replaced cholla as the dominant cacti. (Mitchel P. McClaran).

Attribution: Land Resources
Cattle behind a fence in a dry environment containing few plants and a lot of exposed soil.
December 31, 2006

Curious cattle on the Colorado Plateau

Cattle and grazing management are important to consider when thinking about ecosystem function in water-limited ecosystems. Management style can either promote or hinder productivity. Strategic distribution of water drinkers on the rangeland is a method that ranchers and land managers use to move cattle and reduce the threat of overgrazing. These cattle are keeping watch

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Image: Debris Flow from 2006 Floods in Southern Arizona
September 1, 2006

Debris Flow from 2006 Floods in Southern Arizona

This photograph shows the snout of a debris flow that stopped in the channel of Rattlesnake Creek during the floods of July 31, 2006. This snout is several miles upstream from the confluence of Rattlesnake and Sabino Creeks, and the large boulders are typical of the largest particles transported during debris flows in the southern Santa Catalina Mountains. Most of these

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Attribution: Natural Hazards
Image: Santa Catalina Highway, near Tucson, Southern Arizona - 2006
August 12, 2006

Santa Catalina Highway, near Tucson, Southern Arizona - 2006

Two ranging poles were placed near the positions of two sets of saguaros in order to determine their heights, and hence approximate ages. Most were established in the 1890s, after livestock grazing and the removal of fine fuels had begun in the area. Several small saguaros have become established since the fire; one is to the left of the left-hand ranging pole,

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Attribution: Land Resources
July 29, 2006

Flood Measurement on Rillito River (2006)

USGS employees measuring flood flows on Rillito River in Tucson, Arizona.

July 29, 2006

Flood Measurement Using ADCP (2006)

USGS employees taking flood measurements using an Acoustic Doppler Current Profiler.

July 28, 2006

Flooding in Tucson, AZ (2006)

Measuring floods in Tucson, AZ 2006.

Filter Total Items: 188
USGS
February 8, 2006

Ensuring stable water supplies has grown more complex as the challenges facing water managers continue to mount, especially in the West. Informed decisions of water users and public officials will be necessary to ensure sufficient freshwater resources in the future to support a growing population and economy. 

USGS science for a changing world logo
October 25, 2005

Today, the USGS released The State of the Colorado River Ecosystem in Grand Canyon, a comprehensive report that details the impacts of the operation of Glen Canyon Dam and other management actions on downstream resources within Grand Canyon National Park.

USGS
October 25, 2005

Today, the USGS released The State of the Colorado River Ecosystem in Grand Canyon, a comprehensive report that details the impacts of the operation of Glen Canyon Dam and other management actions on downstream resources within Grand Canyon National Park.

USGS science for a changing world logo
August 24, 2005

A new U.S. Geological Survey (USGS) report estimates that 15 to 20 percent of average annual recharge to aquifers occurs along the normally dry (ephemeral-flow) washes in the Sierra Vista area.

USGS
August 24, 2005

A new U.S. Geological Survey (USGS) report estimates that 15 to 20 percent of average annual recharge to aquifers occurs along the normally dry (ephemeral-flow) washes in the Sierra Vista area.

USGS
August 1, 2005

In its latest report on water use in the United States, the USGS looked at the nation's dependence on ground water. The report entitled Estimated Withdrawals from Principal Aquifers in the United States, 2000, provides details of ground-water withdrawals and use from principal aquifers in each state.

USGS science for a changing world logo
May 23, 2005

The USGS’s Grand Canyon Monitoring and Research Center (GCMRC), under the auspices of the Glen Canyon Dam Adaptive Management Program, will conduct scientific overflights in Grand Canyon National Park over Memorial Day weekend.

USGS
May 23, 2005

The USGS’s Grand Canyon Monitoring and Research Center (GCMRC), under the auspices of the Glen Canyon Dam Adaptive Management Program, will conduct scientific overflights in Grand Canyon National Park over Memorial Day weekend.

USGS science for a changing world logo
December 6, 2004

USGS Director Chip Groat is available for interviews on Dec. 6-7. Please call the contact, above. Groat will present Science for Ecosystem Restoration on Mon, Dec. 6 from 2:20-2:50pm.

USGS science for a changing world logo
November 19, 2004

The Department of the Interior’s U.S. Geological Survey is collaborating with partner agencies to conduct scientific experiments designed to evaluate the effect of a high-flow release from Glen Canyon Dam on the natural resources of the Colorado River in Grand Canyon National Park.

USGS
November 19, 2004

The Department of the Interior’s U.S. Geological Survey is collaborating with partner agencies to conduct scientific experiments designed to evaluate the effect of a high-flow release from Glen Canyon Dam on the natural resources of the Colorado River in Grand Canyon National Park.

USGS science for a changing world logo
November 17, 2004

WASHINGTON — The Department of the Interior has proposed conducting a scientific study on the use of high flows from Glen Canyon Dam to improve Colorado River natural and cultural resources in Grand Canyon National Park.