I purchased this app last winter and love it. I do like the "…[push]notification when a river in the list reaches a certain threshold," idea. I would love that. I do have a couple of other ideas for the app:
1. Allow the user to automatically start in the favorites section. That is always my first touch with the application and what I care about the most. Half the time I open, check the flows on the favorites (sometimes only the first couple of flows) and close. I'm sure I'm not the only one.
2. I don't know if this would actually speed up the launch time for the app but maybe have a separate version with no news. While I care about the press on rafting 99% of the time I just want to see the flows and go boating. If I am to read about rafting it will be on the computer not my phone. Believe it or not I am requesting a application with LESS features. That is just me.
With those suggestions in mind, this is a fantastic application. I just realized I hadn't rated the app yet and just threw 5 stars down. Great application!!!!!!