The PDF documents below list rare species known to occur within watersheds as mapped by the US Geologic Survey (USGS).
Rare species by USGS HUC-8 watershed are arranged by HUC-8 watershed name.
Rare species by USGS HUC-12 watershed are arranged in order of ascending USGS 12-Digit Hydrologic Unit Code (HUC).
Rare Species by HUC-8 Watershed (.pdf format)
Rare Species by HUC-12 Watershed (.pdf format)
Data Manager, Heritage Program