SwimmingHoles.info
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For Android devices (only):  We have a (free) Android app (requires Internet connection to run).  To get it, click Swim N Hole or go to Google Play Store and search for "Swim N Hole" by (exact) name. This is a "native" app on Android.

For all other phones and tablets:  We have a "web app", it is not in any app store, it is a specially designed web page that runs in your browser (requires Internet connection to run). Using the browser on your device go to SwimFone.info and bookmark it. 
 
For all computers and devices, when you won't have an Internet connection: Take entire state maps/pages with you with the excellent (free) program POCKET.  (Use the POCKET option to download as a web page, NOT as text)

 If you have any comments or suggestions about the above, please tell us at mail@SwimFone.info