I don’t know too much about this site other than what I’ve seen looks beautiful.  Here are some web sites that can provide much more information than I can.

This site has current water conditions  http://waterdata.usgs.gov/usa/nwis/uv?01072800

Opening the flood gates on the Cocheco river 

Here is more background information especially if you are a fisherman.  http://www.nhfishfinder.com/cocheco-river-13739-location.html