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The bracket for the Finals! New Jersey's and New Mexico's gages will compete to see whose gage is the greatest for Gage Greatest 2025.

At the USGS, we monitor our nation’s water. Our data informs many people, from kayakers to water managers. Gage Greatness allows any Instagram user to vote for their favorite gage (data collection station).

Screenshot from Water Data for the Nation video on "How to make a current conditions table using new state pages and My Favorites list"

Water Data for the Nation: How to Show Daily Values on Monitoring Location Pages video thumbnail

USGS hydrologic technician Fred Brogan holds an acoustic doppler current profiler (ADCP) while measuring the highest flow measured to-date on Hurricane Creek at Hurricane, WV. Photo by Logan Jarrell, USGS Hydrologic Technician

The U.S. Geological Survey uses a depiction and classification scheme for hydrologic units known as hydrologic unit codes (HUCs). HUCs generally represent catchments, and river basins are represented by a unique series of numbers with successively smaller hydrologic units nested inside of larger ones.

Thumbnail of Introductory slide for USGS Water Resources Mission Area public webinar, NWISWEB Decommission – Campaign 1.

Thumbnail image for the Water Resources Mission Area National Water Availability Assessment Release

Managed aquifer-recharge methods and processes. Managed recharge—which uses water of dissimilar geochemistry from groundwater through infiltration into shallow aquifers or injection into deep aquifers—can alter hydrologic and geochemical aquifer conditions such that arsenic and other geogenic contaminants are mobilized from sediment to aqueous phase.

U.S. River Conditions, October to December 2024 thumbnail image. The river conditions shown range from the driest condition seen at a gage (red open circles) to the wettest (blue closed circles). A purple outer ring around a gage indicates it is flooding. 

Graphs showing water-year total precipitation and air temperatures in the Lower Colorado River Basin from 1896 to 2019, units modified from millimeters to inches of precipitation and from degrees Celsius to degrees Fahrenheit from: Tillman, F.D., Gangopadhyay, S., and Pruitt, T., 2020, Trends in recent historical and projected climate data for the Colorado River Bas

Pie chart showing proportions of major water uses (Agricultural, Municipal, Industrial, and Mining) in Arizona, USA, in 2015

Map of New York State showing the three pilot study areas for interactive products to assist with geothermal drilling.

USGS hydrologic technicians collect water-quality samples on the Mississippi River (USGS monitoring location 322023090544500 Mississippi River Above Vicksburg at Mile 438, MS). 

Edwards aquifer recharge zone community-awareness sign in Texas

Cinnamon teal with a GPS tracking backpack that weighs 10 grams, making it much more successful in staying on longer than heavier tracking devices. 

Alton Anderson of the USGS explaining common geophysical tools used to evaluate boreholes to a group of people at a worksite.

Temperature logger attached to submerged cobble in Quartzville Creek, OR. This logger was placed as part of an ongoing effort to retrieve continuous temperature data from rivers and tributaries within the Willamette River basin, OR.

The three Integrated Water Availability Assessment products are designed to be interdependent: 

Water limitation across the lower 48 United States, shown as the average from 2010 to 2020 for each watershed (HUC12). Water limitation levels were based on the surface water supply and use index, which expresses the imbalance between surface water-supply and consumptive use.

This is a thumbnail for an animation showing the changing conditions relative to the historic record of USGS streamgages from October 1, 2023 - September 30, 2024. The river conditions shown range from the driest condition seen at a gage (red open circles) to the wettest (blue closed circles).