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Plan ahead ! Check the NOAA website for river levels, don't take a tube vendor's word for it,...of course they're gonna tell you it's good tubin', they want to rent tubes.The Frio is a great river, not the elbo to elbo crowds like New Braunfels. (usually) Go in a group big enough where there will be at least two vehicles, trucks preferably(for example) leave one at 2nd crossing, take the other upstream to Magers Crossing, just come back and get the other when you get out....don't want to mess with tube vendors ? Plan ahead, go buy a innertube, and a junky little air compressor that plugs into a cigarette lighter(Wal-Mart, Target, Tractor Supply)...sit under a cypress tree with a cold one while your tube inflates. Tubing down a river with a beer is one of life's simple pleasures, no need to make it aggrevating and complicated.
P.S., If you hear thunder to the North, be ready to beat feet off that river, it'll flash flood your ass in a heartbeat.
Enjoy !