NOTICE: In January 2020, USGS WaterWatch began operating in maintenance-only mode. Existing tools, features, and web data services are being fully maintained as before, but new tools and enhancements will no longer be developed. Please click here for more information or contact USGS WaterWatch if you have any questions.

Special Features

Flow Duration Curve

Create a USGS flow duration curve dynamically. Choose USGS streamgage and specify the beginning and ending dates to create a curve

Duration curve and click to view a large image with more options

Streamflow -- Water Year 2020

The maps and graphs in this summary describe national streamflow conditions for water year 2020 (October 1, 2019, to September 30, 2020) in the context of streamflow ranks relative to the 91-year period of water years 1930–2020.

2020 water-year summary

Duration Hydrograph with backdrop of monthly flow percentiles

Present a time-history streamflow along with backdrop of monthly-flow percentiles.

Duration Hydrograph and click to view a large image with more options

Streamflow Map

View all streamflow condition maps in a seamless way. Provide tools for quick zooming, panning, and full screen. Search USGS streamgages easily by state, huc, and site name and number.

Dynamic map

Streamgage Dashboard

Collection of WaterWatch popular streamflow analysis tools for a streamgage.

WaterWatch streamgage dashboard

State Streamflow Dashboard

Collection of WaterWatch streamflow analysis tools for a state.

WaterWatch state-streamflow Analysis

Data Services

Data services for all WaterWatch streamflow data and flow statistics

WaterWatch data services

Map Shapefile

Download WatrWatch streamflow condition maps in shapefiles.

Map shapefile download

Map Data

Download WatrWatch map data in various formats such as XML and KML.

Map data download