Unified Interior Regions


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: 142
Date published: August 1, 2016
Status: Active

Ecology of Insect-eating Bats

Bats are the only flying mammals that are active mostly at night and occur on all continents except Antarctica. Bats are ecologically diverse, with a range of species that specialize in feeding on fruit, nectar, blood, fish, small mammals, and insects. However, of the more than 1,100 known species of bats on Earth, the majority specialize in feeding on insects. In the United States for example...

Date published: July 26, 2016
Status: Active

HDgov: Multi-agency Website for Human Dimensions of Natural Resources

HDgov is an interactive and mobile-responsive online portal to interagency, academic, and non-government resources focused on the human dimensions of natural resource management. The web portal provides easy access to tools, publications, data, and methods that help ensure that the people side of natural resources is considered throughout the entire natural resource management process. The...

Date published: July 26, 2016
Status: Active

National Park Service Visitor Spending Effects

The National Park Service (NPS) manages the Nation’s most iconic destinations that attract millions of visitors from across the Nation and around the world. Trip-related spending by NPS visitors generates and supports a considerable amount of economic activity within park gateway communities. USGS economists collaborate with the National Park Service social science program to estimate NPS...

Date published: July 21, 2016
Status: Active

North American Waterfowl Management Plan

The ultimate success of North American Waterfowl Management Plan (NAWMP) depends on maintaining relevance to stakeholders and society. In order to be relevant, a first step is to better understand what people value in regard to waterfowl and their habitats. 

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
Status: Active

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: Active

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: 134
Publication Thumbnail
Year Published: 1973

Geohydrology of the Parker-Blythe-Cibola area, Arizona and California

Metzger, D.G.; Loeltz, Omar J.; Irelan, Burdge
Geohydrology of the Parker-Blythe-Cibola area, Arizona and California; 1973; PP; 486-G; USGS NUMBERED SERIES; Water resources of Lower Colorado River-Salton Sea area; Metzger, D. G.; Loeltz, O. J.; Irelan, Burdge

Publication Thumbnail
Year Published: 1973

Geohydrology of the Yuma area, Arizona and California

Olmsted, F.H.; Loeltz, Omar J.; Irelan, Burdge
Geohydrology of the Yuma area, Arizona and California; 1973; PP; 486-H; USGS NUMBERED SERIES; Water resources of Lower Colorado River-Salton Sea area; Olmsted, F. H.; Loeltz, O. J.; Irelan, Burdge

Filter Total Items: 254
September 30, 2012


Working at the USGS can be fun. These student employees were given wonderful opportunities and made lasting friendships while working at the USGS.

September 12, 2012

Continuous Slope Area Method: Sycamore Creek, AZ

A video depicting the installation & operation of Continuous Slope Area gage and radar sensor, installed after the Sunflower Wild Fire on Sycamore Creek to measure streamflow from the Sunflower burned area. The streamflow data is used to provide flood warning to communities affected by runoff from the burned areas and for collecting streamflow data from areas that have

July 5, 2012

2012 Whitewater-Baldy Fire

USGS installed six early-flood-warning units—rain and stream gages—in the burned areas resulting from New Mexico's 2012 Whitewater-Baldy Fire. The gages transmit data via satellite to provide warnings to communities that may be affected by flooding.

October 2, 2011

Nat'l Comparison of USGS Compiled Irrigation Water Use Data

Highlights of the Scientific Investigations Report 2011-5166 which documents methods of irrigation and inventories irrigation data collected for the 2000 and 2005 U.S Geological Survey.

Valles Marineris on Mars
September 29, 2011

Valles Marineris on Mars

Mosaic of the Valles Marineris hemisphere of Mars projected into point perspective, a view similar to that which one would see from a spacecraft. The distance is 2500 kilometers from the surface of the planet, with the scale being .6km/pixel. The mosaic is composed of 102 Viking Orbiter images of Mars. The center of the scene (lat -8, long 78) shows the entire Valles

August 10, 2011

Post-fire Flash Flood in Coronado National Memorial, Arizona

Video footage begins with dry streambed, and within the first 10 seconds a very dark, roiling, flow comes downstream toward the viewer. The rest of the video is footage of the flow going past, and into a culvert under a bridge. The video was recorded at the U.S. Geological Survey streamgage site near the Coronado National Memorial visitor center, in southern Arizona. The

Image: Landsat Photo: Wallow Fire, Arizona
June 7, 2011

Landsat Photo: Wallow Fire, Arizona

This Landsat imagery was taken on June 7, 2011. Path/Row: 35/36 and 37 Lat/Long: 33.820/-109.330

Image: Drilling in Cinder Lake, Arizona
June 3, 2011

Drilling in Cinder Lake, Arizona

Boreholes being drilled at Cinder Lake as part of a U.S. Geological Survey study to determine the feature's floodwater storage capacity. Cinder Lake, which is located on the Coconino National Forest, has been used to store runoff from areas affected by the 2010 Schultz Fire outside of Flagstaff, Arizona.

Attribution: Natural Hazards
May 5, 2011

Electronic Tape Calibration Procedure

A training video discussing how to calibrate the electronic tape.

May 5, 2011

Microgravity Measurement for Groundwater Analysis

A video discussing the Gravity Meters used at the USGS Arizona Water Science Center.

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
Filter Total Items: 202
USGS science for a changing world logo
April 24, 2009

U.S. Geological Survey scientists will brief reporters by phone at 3:00 pm Eastern Daylight Time/12:00 pm Mountain Standard Time. Monday, April 27, on the latest population numbers for the humpback chub (Gila cypha) in Grand Canyon, Arizona.

USGS science for a changing world logo
March 2, 2009

Volunteers across the nation are being recruited to get outdoors and help track the effects of climate on seasonal changes in plant and animal behavior.
The USA-National Phenology Network (USA-NPN), a consortium of government, academic and citizen-scientists, is launching a new national program built on volunteer observations of flowering, fruiting and other seasonal events.

USGS science for a changing world logo
February 25, 2009

Unique fractures in lavas on ancient Mars suggest water occasionally flooded portions of the planet's surface.
The fractures, known as "columnar joints", are the first that have been observed on a planet other than Earth.

USGS science for a changing world logo
February 12, 2009

Astrogeologists at the U.S. Geological Survey in Flagstaff provided critical datasets used in the latest release of Google Earth. The updated software enables users to explore Mars in high detail.
"Without the ability to accurately co-align data sets, applications like Google Earth would not be nearly as useful," said Trent Hare, a GIS expert with the USGS Astrogeology Team.

USGS science for a changing world logo
December 18, 2008

Dr. Julio Betancourt, a U.S. Geological Survey senior scientist, was recently awarded a prestigious 2008 Presidential Rank Award. Betancourt, who has conducted groundbreaking research in how climate variability affects ecosystems, is also an adjunct professor at the University of Arizona, where he received his graduate degrees.


October 9, 2008

Local planetary geologist Chris Okubo is on a mission to understand the past roles of groundwater and faulting on Mars by studying similar locations on Earth.  Okubo works in the Astrogeology Research Program for the U.S. Geological Survey (USGS) in Flagstaff.

June 17, 2008

Long-term trends in landscape conditions have significantly reduced sagebrush habitat and populations of greater sage-grouse, according to a new study examining the bird's chances of survival.

April 21, 2008

The Upper San Pedro Partnership was recognized with the Department of the Interior's Cooperative Conservation Award today.

April 7, 2008

Time lapse videos of sandbars from the Glen Canyon Dam high flow experiment have been released by the U.S. Geological Survey (USGS).

March 18, 2008

Competition for water is becoming more intense as the nation's population continues to grow, increasing the demands for water use in agriculture and power production.

March 13, 2008

A report published by the U.S. Geological Survey (USGS) contains a regional map and associated database that inventory 121 locations of reported natural asbestos and fibrous amphibole occurrences in the Southwestern United States, including Arizona, Nevada, and Utah.

February 29, 2008

Salt Lake City - The Bureau of Reclamation today released a final environmental assessment (FEA) and a Finding of No Significant Impact (FONSI) that authorizes the initiation of an early-March 2008 high-flow test and fall steady flow experiment from Glen Canyon Dam downstream through the Grand Canyon