I just stumbled across a great tool for the hard core boater/fisherman.
On the USGS water gauge site there is a real time notification you can subscribe to for free for each gauge. And you can set the parameters to your likings. This is definitely something I am going to be using for gauges that are upstream from me and at my launch. To give me warning and see what is coming if I am out and bad weather strikes, or to plan a trip.
If you usually watch the gauges like a hawk then you would have an idea where to set your warnings at, in this example I am using the gauge at the PA TPK on Valley Creek in Valley Forge. This stream dumps into the river above me at the train station in VF Park. Most of you fishermen from this area know where that is. One of my favorite spots is not far from that and of for some reason there is an exceptional rise detected it would be a great warning to me.
There are a few other guages I will be subscribing to also, including the Perkiomen Creek, Skuke at Pottstown, and Skuke at Norristown.
Here is a walk through of how to sign up for each gauge.
And this can be used anywhere in the nation that this map shows a gauge location for, for the most part:
When you click on the "peak chart" link, it opens this window and shows a history of that creek's heights. With this you can judge where you would like your setting to be. I am finicky so I chose 4 ft.