Wundermap is a great resource for a quick look at USGS river gauges on one big map. All you have to do is check the Rivers box on the right and most of your gauges will appear on the map and you can click on them and pull up the graph that you are use to seeing. Here is a screenshot of Birmingham and Atlanta with the guages showing. Click each one and it will link you to the USGS guage.
Another good tool to know the weather before you go.
Noaa advanced hydrological prediction service, they forecast the rise and fall of rivers and creeks. http://water.weather.gov/ahps/ You can see in the screenshot below the precition of the river level with the dotted lines. Not all USGS guages have this.
Along with the hydrological prediction service goes the Precipitation Map so you can see how much rain their has been for those areas without the prediction service.
USGS Real Time water data for the Nation, get almost all the info you need on your flow here.
This is a great map to use for studying new areas, lots and lots of options and overlays on this map. It has so many options and such I can’t begin to tell you. One of the best layers to add is the scanned topo maps, this is the maps like you see in the Gazetteers.
Another map that is designed for anglers, supported with ads on the side but it can be a useful map. You might prefer it’s simpler menu than the map above. It has a subscription to unlock all it’s potential.
Lake information for Alabama Power with Generating Schedules, may help you but not always reliable.
Corp of Engineers Mobile District website for water management. Very useful information divided up by river basin. You can get Hydropower Generation Schedules here.
Alabama whitewater website can give you some great information and ideas for somewhere new.
Animated knots so you can easily learn that new fishing knot you always need but don’t know.
USGS streamflow guages for your Droid phone.