NWISWeb Tutorial

How to access historical streamflow data in your watershed

Start at a Web page for a station in your watershed (How do I find a station in my watershed?)

Step 1

Choose Recent daily under Available data for this site.

You will get a graph like the one below, which shows 31 days of daily mean streamflow values (average streamflow for each day) at this station on the Little River in Tennessee:

Step 2

For more data, delete the default value 31 days and enter a number up to 548.

Step 3

For another perspective, choose Surface-water: Peak Streamflow under Available data for this site.

You will get a graph like the one below, which shows the highest streamflow for each year of the period of record at the station.

Step 4

For another way to look at streamflow data over the long term, choose Surface-water: Annual streamflow statistics under Available data for this site.

You will get a table like the one below, which lists the mean (average) streamflow for each year of the period of record at this station in Virginia.

Step 5

To explore more historical data, choose from options under Available data for this site.

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