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USGS Surface Water Information

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New & Noteworthy

T&M Chapters
Stage, Discharge, & Levels

WaterAlert USGS WaterAlert

Streamflow Summary 2014 Streamflow Summary

Threatened Streamgages Threatened and Recently Discontinued Streamgages

Calendar Streamgaging Calendar

Today's Water Conditions

View maps of current and historical conditions

Click map to go to current water resources conditions in the U.S. WaterWatch Streamflow
Flood & High Flow Flood and high flow
Drought Drought
Groundwater Networks Groundwater levels
Water Quality Watch Surface water quality

USGS in Your State

USGS Water Science Centers are located in each state.

 [Map: 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 and Pacific Islands New York Vermont New Hampshire Maine Massachusetts South Carolina North Carolina Rhode Island Virginia Connecticut New Jersey Maryland-Delaware-D.C.

Other Water Sites

OGW Office of Ground Water

OWQ Office of Water Quality

OHR Office of Hydrologic Research

OHR Cooperative Water Program

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Selected USGS Surface-Water Programs & Activities

Flood Inundation Mapping Science

A powerful new tool for flood response and mitigation are digital geospatial flood-inundation maps that show flood water extent and depth on the land surface.

National Streamflow Information Program (NSIP)

The USGS operates and maintains approximately 7,500 streamgages which provide long-term, accurate, and unbiased information on streamflow to meet the needs of many diverse users.

National Streamflow Statistics (NSS) Program

The NSS Program is a desktop computer program that replaces the National Flood Frequency Program (NFF) to provide simple methods of estimating streamflow statistics for ungaged sites that are needed for planning, regulatory, and design purposes. The NSS program contains regression equations for estimating peak-flow and low-flow magnitudes and frequencies, flow-duration discharges, and other statistics. User input of the basin characteristics used as explanatory variables in the equations is required to obtain the flow estimates. Equations for estimating peak-flow statistics are available nationally. Availability of equations for estimating other statistics varies by State.


StreamStats is a Web-based Geographic Information System (GIS) that provides users with access to an assortment of analytical tools that are useful for water-resources planning and management, and for engineering design applications, such as the design of bridges.


The USGS has been involved in developing and using acoustic flow measurement technology since the late 1960s to improve the accuracy of an efficiency of streamflow measurements.

USGS Office of Global Change: Welcome

What is Climate Change? The USGS strives to understand how the earth works and to anticipate changes in how the earth functions. To accomplish this, USGS science aims to understand the interrelationships among earth surface processes, ecological systems, and human activities. This includes understanding current changes in the context of pre-historic and recent earth processes, distinguishing between natural and human-influenced changes, and recognizing ecological and physical responses to changes in climate.

Storm-Tide Monitoring

The USGS developed a mobile storm-surge network to capture information of the timing, extent, and magnitude of storm tide.

Watershed Modeling

Modeling of watershed response to normal and extreme climatic conditions or to changes in the physical conditions of a watershed requires the simulation of a variety of complex hydrologic processes and process interactions.

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Page Last Modified: Wednesday, 13-Jan-2016 13:32:33 EST