At the request of my roommate, I have just finished developing a free app (No ads either!) that gives you quick access to NOAA River Gauges all over the country. You can use the gauges to view river levels and flow to help find your daily fishing spot. You can also save your favorite gauges for quick access later. I'll be adding in sunrise/sunset soon, as well as tides.
I'd love any feedback you can offer both in terms of new features, and any bugs you may experience.
If you're interested in the App, you can find it in the Google Play store by searching "HydroGauges" or by copying the link below:
https://play.google.com/store/apps/details?id=com.bemoreapps.HydroGauges.app