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: 229
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.

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

...
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
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,

...
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.

Filter Total Items: 191
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
February 14, 2006

What are the issues desert tortoises face, and what has been learned and accomplished?

USGS
February 14, 2006

A symposium that focuses on the issues, research and management of the desert tortoise in the deserts of the southwestern United States and Mexico.

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. 

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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.

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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.

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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.

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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.