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Arizona Water Science Center

Welcome to the U.S. Geological Survey Arizona Water Science Center.  Our mission is to collect and interpret high quality, impartial scientific information to provide resource managers and the public with the knowledge required to understand and manage the critical water resources of Arizona and the Southwest.

News

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A Century of Watching the Colorado River

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USGS Arizona Water Science Center to participate in Colorado River Low Flow event

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USGS Unveils Mobile Flood Tool for the Nation

Publications

An assessment of uranium in groundwater in the Grand Canyon region

The Grand Canyon region in northern Arizona is a home or sacred place of origin for many Native Americans and is visited by over 6 million tourists each year. Most communities in the area depend upon groundwater for all water uses. Some of the highest-grade uranium ore in the United States also is found in the Grand Canyon region. A withdrawal of over 1 million acres of Federal land in the Gran

Improving groundwater model calibration with repeat microgravity measurements

Groundwater-flow models depend on hydraulic head and flux observations for evaluation and calibration. A different type of observation—change in storage measured using repeat microgravity—can also be used for parameter estimation by simulating the expected change in gravity from a groundwater model and including the observation misfit in the objective function. The method is demonstrated using new

Preliminary geohydrologic assessment of Buenos Aires National Wildlife Refuge, Altar Valley, southeastern Arizona

The Buenos Aires National Wildlife Refuge is located in the southern part of Altar Valley, southwest of Tucson in southeastern Arizona. The primary water-supply well at the Buenos Aires National Wildlife Refuge has experienced a two-decade decrease in groundwater levels in the well, as have other wells in the southern part of Altar Valley. In part to understand this trend, a study was undertaken b

Science

Aquifer-storage monitoring at Tucson Water’s Heritage Project

Tucson Water’s Santa Cruz River Heritage Project releases up to 3,150 acre-feet a year of reclaimed water into the Santa Cruz River channel near downtown Tucson, AZ, much of which is expected to recharge to the subsurface through the channel bottom. Tracking the movement of recharged water is necessary to limit the dispersal of that water within specific target boundaries, and to enable resource...
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Aquifer-storage monitoring at Tucson Water’s Heritage Project

Tucson Water’s Santa Cruz River Heritage Project releases up to 3,150 acre-feet a year of reclaimed water into the Santa Cruz River channel near downtown Tucson, AZ, much of which is expected to recharge to the subsurface through the channel bottom. Tracking the movement of recharged water is necessary to limit the dispersal of that water within specific target boundaries, and to enable resource...
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Urban Waters Federal Partnership – Groundwater and Surface Water Characterization of the Lower Gila River for the Rio Salado Project

In partnership with the Flood Control District of Maricopa County and as part of the Urban Waters Federal Partnership, the US Geological Survey is collecting water-quality and water-level data to help characterize the shallow groundwater and surface water along the Lower Gila River. Water sampling and continuous monitoring of specific conductance, surface water, and shallow groundwater level...
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Urban Waters Federal Partnership – Groundwater and Surface Water Characterization of the Lower Gila River for the Rio Salado Project

In partnership with the Flood Control District of Maricopa County and as part of the Urban Waters Federal Partnership, the US Geological Survey is collecting water-quality and water-level data to help characterize the shallow groundwater and surface water along the Lower Gila River. Water sampling and continuous monitoring of specific conductance, surface water, and shallow groundwater level...
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Grand Canyon Streamflow and Sediment Project

The AZWSC Grand Canyon Streamflow and Sediment project supports the work of Grand Canyon Monitoring and Research Center’s (GCMRC) Discharge, Sediment and Water Quality Project. This support is accomplished by collecting sediment, temperature, and streamflow data from tributaries of the Colorado River in Grand Canyon and by collecting temperature and streamflow data on the main stem of the Colorado...
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Grand Canyon Streamflow and Sediment Project

The AZWSC Grand Canyon Streamflow and Sediment project supports the work of Grand Canyon Monitoring and Research Center’s (GCMRC) Discharge, Sediment and Water Quality Project. This support is accomplished by collecting sediment, temperature, and streamflow data from tributaries of the Colorado River in Grand Canyon and by collecting temperature and streamflow data on the main stem of the Colorado...
Learn More