California Department of Water Resources
Data Exchange Center provides current river conditions, stages, flows, river and tide forecasts, snowpack status, precipitation and snow information, satellite images, water supply and weather forecasts.
Colorado Basin River Forecast Center
Forecasts, and information about rivers in the Colorado and eastern Great basins.
United States NWIS-W Data Retrieval
Access daily information from all the water level gauges in the US.
Water level data focused mainly on the Western States.
West Virginia Gauges Information
New, Gauley, Tygart, Potomac and Big sandy River using data from the Army Corps of Engineers and USGS.