There is one automated river gauge that can be viewed on the EPA website here:
http://hydronet.epa.ie/stat_110215.htm?entryparakey=W
As far as I am aware it updates once a day, in the morning, like the IWW gauges.
They also have numerous other gauges, most of these are checked manually and therefore are only graphed every 1 to 2 weeks - but they will all be automated eventually.
Enjoy!