Water Resources of the United States


National Water Information System

View current and historical streamflow, ground-water level, and water-quality data

Today's Water Conditions

View comparisons of current and historical conditions using maps
Click map to go to current water resources conditions in the U.S.



USGS Water Science Centers are located in each state

USGS In Your State (clickable)There is a USGS Water Science Center office in each State.
Washington Oregon California Idaho Nevada Montana Wyoming Utah Colorado Arizona New Mexico North Dakota South Dakota Nebraska Kansas Oklahoma Texas Minnesota Iowa Missouri Arkansas Louisiana Wisconsin Illinois Mississippi Michigan Indiana Ohio Kentucky Tennessee Alabama Pennsylvania West Virginia Georgia Florida Caribbean Alaska Hawaii New York Vermont New Hampshire Maine Massachusettes South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.

Cooperative Matching Funds

Products > Water Availability and use > Streamflow

All Streamflow Products


thumbnail Streamflow Information Now Available for Ungaged Streams in Pennsylvania –USGS, in cooperation with the Pennsylvania Department of Environmental Protection, the Susquehanna River Basin Commission, and The Nature Conservancy, developed the Baseline Streamflow Estimator, called "BaSE," which provides users with estimated daily mean streamflow, minimally altered by human activities, for locations on Pennsylvania streams that don’t have streamgages. Water-resource managers use daily mean streamflow to evaluate withdrawal, allocation, and wastewater permit applications and to assess the health of the Commonwealth's streams.  Historically, it has been difficult, costly, and time intensive to estimate daily mean streamflow for stream locations that were not gaged or monitored. BaSE allows users to estimate daily mean streamflow values and daily hydrographs by entering a few basic basin characteristics in an easy-to-use tool.  The output is a summary spreadsheet, containing information about the location of interest, including daily mean streamflow for every day from 1960 to 2008. (Technical announcement; Report; BaSE tool and supporting documentation)


thumbnail Streamflow trends within and near the Chesapeake Bay watershed –USGS, in cooperation with the Virginia Department of Environmental Quality, assessed long-term streamflow data within the Chesapeake Bay watershed and surrounding area to identify trends over the last 8 decades (1930-2010). Trend slopes for three runoff statistics (the 7-day minimum, the mean, and the 1-day maximum) were analyzed spatially and temporally (annual and seasonal). The spatial results indicated that trend slopes in the northern half of the watershed were generally greater than those in the southern half. Temporal results indicated that the period 1930 through 1969 was statistically different from the period 1970 through 2010. In no case was a change identified that indicated an increasing rate of change over time, and no general pattern was identified of hydrologic conditions becoming "more extreme" over time. (Full report)


A Water Availability Tool for Environmental Resources (WATER) –was developed by the USGS Kentucky Water Science Center in cooperation with the Kentucky Division of Water to provide a consistent and defensible method of estimating streamflow, water availability, and other hydrologic information in ungaged basins. WATER automatically incorporates and processes large amounts of basic and custom geospatial data to quantitatively describe topography, soil-water storage, climate, streamflow, and other parameters. WATER is also designed so that it can be expanded for other science and regulatory applications including, but not limited to, sediment and nutrient loads, evaluation of surface mining effects (Cumulative Hydrologic Impact Assessments), as well as flows that are necessary for ecological viability.


thumbnail USGS Celebrates 100-Year Old Streamgage near Duncan, Nebraska –The Platte River near Duncan streamgage, just upstream from the Platte's confluence with the Loup River, began operating on June 4, 1895. For more than a century of operation, this USGS streamgage has contributed abundant information about water levels to farmers, decision makers, scientists, planners, and the public by helping assure future water supplies, sound water-resources management, safe infrastructure design, and proper flood zoning (Media advisory and access to photos and data). Starting in the 1990s, however, many such long-term streamgages were discontinued due to lack of funding (Learn more about threatened gages across the U.S. for discontinuation).


thumbnail Tracking Flow in the Rio Grande, North-Central New Mexico, 2010 – USGS, in cooperation with the Coalition of Six Middle Rio Grande Basin Pueblos, conducted a comprehensive survey and released a report on numerous models developed by Federal, State, and local agencies in New Mexico to simulate, understand, and (or) manage flows in the Middle Rio Grande upstream from Elephant Butte Reservoir. The six Middle Rio Grande Pueblos have prior and paramount rights to deliveries of water from the Rio Grande for their use. The survey of hydrologic models will help water-resource managers at the Pueblos and the Bureau of Indian Affairs Designated Engineer make informed water-resource-management decisions that affect water use. Analysis of 4 publicly available surface-water models and 13 publicly available groundwater models shows that, although elements from many models can be helpful in tracking flow in the Rio Grande, numerous data gaps and modeling needs indicate that accurate, consistent, and timely tracking of flow on the Rio Grande could be improved.


thumbnail StreamStats –is a Web-based Geographic Information System (GIS) that allows users to easily obtain streamflow statistics, drainage-basin characteristics, and other information for user-selected sites on streams. The national system is supported by the USGS Office of Surface Water; separate applications have been established for many States, often in cooperation with State agencies through the Cooperative Water Program. As of October 2011, StreamStats was available to the public (fully implemented) for 26 states - Alabama (partial), California, Colorado, Connecticut, Delaware, Hawaii, Idaho, Illinois, Indiana, Kentucky, Maryland (partial), Massachusetts, Minnesota, New Hampshire, New Jersey, New Mexico (partial), New York, North Carolina (partial), Ohio, Oklahoma, Oregon, Pennsylvania, Tennessee, Utah, Vermont, and Washington. The application also was undergoing quality assurance in preparation for public release in South Dakota and Rhode Island. Plans for fiscal year 2012 include completing state-wide implementation of Alabama, Maryland, Rhode Island, and North Carolina, and implementing five new states - Arkansas, Arizona, Mississippi, North Dakota, and Wisconsin. In addition, updates to regression equations and/or supporting GIS datasets will be made to the applications for Hawaii, Kentucky, Maryland, Oregon, Tennessee, Utah, and Washington. Map shows StreamStats for North Carolina, developed in cooperation with the North Carolina Department of Transportation (NCDOT).


thumbnail Stream flow gains and losses in the Salt Basin, southeastern New Mexico –A USGS report, done in cooperation with the New Mexico Interstate Stream Commission, estimates mean-annual streamflow for selected channels in the Salt Basin, southeastern New Mexico. As much as 57 million acre-feet of groundwater may be stored in the subsurface of the New Mexico part of the Salt Basin in southern Otero County, New Mexico. Recharge to a system such as the Salt Basin aquifer can result largely from focused recharge of surface water in channels and at mountain fronts.


thumbnail Low-flow statistics for unregulated streams in Kentucky –A USGS study, done in collaboration with the Kentucky Energy and Environment Cabinet, Division of Water, provides estimates of, and presents methods for estimating, selected low-flow frequency statistics for unregulated streams in Kentucky.


thumbnail Streamflow statistics for selected streams in Pennsylvania and surrounding States –A USGS report, done in cooperation with the Pennsylvania Department of Environmental Protection, presents updated streamflow statistics for 526 USGS continuous-record streamgages in Pennsylvania, New York, New Jersey, Delaware, Maryland, West Virginia, and Ohio using data collected through 2008.


thumbnail Seasonal streamflow statistics for unregulated streams in West Virginia –A USGS report, done in cooperation with the West Virginia Department of Environmental Protection, Division of Water and Waste Management, estimates seasonal low-flow frequency values for unregulated streams in West Virginia

USGS Home Water Climate Change Science Systems Ecosystems Energy, Minerals, & Env. Health Hazards USGS Intranet

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: https://water.usgs.gov/coop/products/availability/streamflow.html
Page Contact Information: Water Webserver Team
Page Last Modified: Friday, 03-Jun-2016 13:44:52 EDT