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: 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.

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
Filter Total Items: 204
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.

USGS
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.

USGS
May 27, 2004

A group of federal and university scientists today announced the launch of the Western Mountain Initiative, a 5-year effort funded by the U.S. Geological Survey (USGS) to better understand ongoing changes in the mountains of the western United States.

USGS science for a changing world logo
April 26, 2004

Farmlands, wetlands, forests and deserts that composed the American landscape in the early 20th century have frequently been transformed during the past 30 years into mushrooming metropolitan areas as urbanization spreads across the country.

USGS
April 26, 2004

Farmlands, wetlands, forests and deserts that composed the American landscape in the early 20th century have frequently been transformed during the past 30 years into mushrooming metropolitan areas as urbanization spreads across the country.

USGS science for a changing world logo
August 8, 2003

Wesley Ward has been named Regional Executive for Geology for the Western Region of the U.S. Geological Survey (USGS). The announcement of Ward’s new appointment was made by John D. Buffington, Western Regional Director, effective Aug. 11, 2003.

USGS science for a changing world logo
March 4, 2003

It’s 6 in the evening on February 12 at a sandy campsite on the banks of the Colorado River in northeastern Arizona. A crew of 18 is assembled 50 river miles downstream of Lees Ferry in the Grand Canyon of the Colorado River. The sun has disappeared long ago from the steep canyon walls, and nighttime temperatures hang at a cool 40 degrees Fahrenheit.

USGS
March 4, 2003

It’s 6 in the evening on February 12 at a sandy campsite on the banks of the Colorado River in northeastern Arizona. A crew of 18 is assembled 50 river miles downstream of Lees Ferry in the Grand Canyon of the Colorado River.

USGS
February 14, 2003

Not long ago, conventional wisdom was that you couldn’t predict the climate for more than a few days in advance. Then came the awareness of El Niño and La Niña and the forecast window increased to as much as 6 to 9 months, depending on the region and season.