Data and Tools


Get current water conditions that are important to you, such as water levels, streamflow, temperatures, and more.

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Hydrograph of Stoney Brook at Princeton gage
August 11, 2017

Surface-water Data for New Jersey

Real-time, daily, peak-flow, field measurements, and statistics of current and historical data that describe stream levels, streamflow (discharge), reservoir and lake levels, surface water quality, and rainfall in New Jersey. Surface water data are collected and stored as either discrete field-water-level measurements or as continuous time-series data from automated recorders.

Outline of the State of New Jersey with USGS Streamflow sites noted
August 11, 2017

Water Watch

WaterWatch is a U.S. Geological Survey (USGS) World Wide Web site that displays maps, graphs, and tables describing real-time, recent, and past streamflow conditions for the United States. 

Map of River gages in New Jersey
August 11, 2017

USGS Water Alert

Select your favorite USGS streamgage from the USGS WaterAlert map, then set water stage or streamflow thresholds to receive instant notifications sent to your email address or mobile device. Click the image at left or the title above to go to the map and select your site(s).

Graphic map of New Jersey Rivers
August 11, 2017

USGS WaterNow

Want to know what's happening right now? Request real-time information from any USGS streamgage with the USGS WaterNow text service. This service responds to your text message with information about the current stage, streamflow, or other parameters collected at the gage. 

Photo of historic water data reports for New Jersey
August 11, 2017

Annual Water Data Reports

Annual Water Data Reports were published annually for many decades as static archival products that supplemented direct access to current and historical water data provided by the National Water Information System (NWIS). This site helps users access historical Water Data Reports, electronic Site Data Sheets, or current on-demand, print-ready Water-Year Summaries.

Outline of the State of New Jersey with USGS Streamflow sites noted
August 11, 2017


The USGS StreamStats website is a GIS-based web tool for estimating streamflows at gaged and ungaged locations. Features similar to the NSS program are presented to users with no programs to install. Users can visit the StreamStats website linked here and click on a stream location on the interactive map to compute estimated streamflows for floods and other statistics.

A StreamStats map image of the eastern United States
August 9, 2017

StreamStats for Virginia and the Nation

Interactively identify a watershed boundary and obtain detailed streamflow statistics.

For an introduction to StreamStats click HERE. For Virginia-specific StreamStats information click HERE.

To use StreamStats Beta Version 4 click HERE. To use the older Virginia StreamStates Version 3 click HERE.


map of beach status of Lake Ontario and Lake Erie in New York
July 6, 2017

New York Nowcast Beach Status

New York Nowcast predicts water quality conditions at select beach swimming areas in NY. The Nowcast estimates conditions by merging environment and climate data with variables measured at a beach by 8 AM each morning and entering them into a computer program which provides a probability from 1 to 100 as to whether or not the beach has exceeded the bathing-water standard of 235 units of E. coli.

map of flood inundation in New York
July 5, 2017

Flood Inundation Mapper

USGS Flood Inundation Maps , along with Internet information regarding current stage from the USGS streamgage, provide emergency management personnel and residents with information that is critical for flood-response activities, such as evacuations and road closures, as well as for post-flood recovery efforts.

map image
July 4, 2017

StreamStats for New York

StreamStats for New York can be used to estimate (1) instantaneous flood discharges with exceedance probabilities of 0.8, 0.667, 0.5, 0.2, 0.1, 0.04, 0.02, 0.01, 0.005, and 0.002 (1.25-, 1.5-, 2-, 5-, 10-, 25-, 50-, 100-, and 500-year recurrence intervals, respectively) for ungaged, unregulated, rural streams throughout New York; (2) bankfull discharge and channel characteristics of streams in NY.

map to explore estimates of future peak flows
July 3, 2017

Climate Change Tool

Application of Flood Regressions and Climate Change Scenarios to Explore Estimates of Future Peak Flows

image of groundwater well map for Long Island
July 2, 2017

Long Island Depth to Water Viewer 2013

USGS collects groundwater data at varying measurement frequencies to monitor the hydrologic conditions on Long Island, New York. Each year during April and May, the USGS conducts a synoptic survey of water levels to define the spatial distribution of the water table and potentiometric surfaces within the three main water-bearing units underlying Long Island.