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StreamStats is not available where I need information. Are there any alternatives?

By StreamStats

StreamStats is still expanding to new areas but if your state/region isn't included, here are a few other options that may help.

If you want to get only a basin delineation, then you can use ESRI’s Watershed Explorer tool, which can be found at http://www.arcgis.com/home/item.html?id=bbd10d91da4f4ffbbdfd8db1d677053c. Use of this tool requires an ArcGIS Online account. Alternately, if you have a basin that is less than about 1.5 square miles, then you can use the USGS National Map Viewer to hand delineate the boundary and get the area.  To do that, go to https://apps.nationalmap.gov/viewer/, zoom into your location of interest, click on the Advanced tab above the map and then on the Area button, and then begin your delineation.  Double-click to end it. The resulting area will be shown.

If you want a watershed polygon, that is quite a bit more complicated. There is a web service from EPA here: https://watersgeo.epa.gov/openapi/waters/

You need to be a web developer, though, to figure out how to use that.

If you need to get the polygon, and you have access to ArcGIS products. You can try the National Map Downloader. You can get it here: https://apps.nationalmap.gov/downloader/