Surface-Water Data for the Nation
http://nwis.waterdata.usgs.gov/nwis/sw

USGS


This USGS site presents surface-water data. It includes detailed information from a number of sites around the nation. Real-time, recent, and streamflow data is included, as well as field measurements and a tutorial explaining how to perform a surface water retrieval and understand the results.

This resource is referenced here:
Subject: Geoscience:Hydrology:Ground Water:Water supply/water resource evaluation
Resource Type: Scientific Resources:Collection
Topics: Hydrosphere/Cryosphere:Groundwater:Water supply/water resource evaluation