* USGS Home
* USGS Water Resources Division
* NWIS Web - USGS WRD Corporate Database
Find other USGS data for sites of interest from the National Water Information System. Data available from this site includes: Daily Discharge, Water Levels, Water Quality, Real Time Data, and more.
* Comparison of the NAWQA DWH with the USGS NWIS Web database
Summary of similarities and differences between the two databases
* National Biological Information Infrastructure (NBII)
Home page--Overview of site content
Fisheries and Aquatic Resources Information--"Live" maps at several scales and fisheries-related data