NEW BRAUNFELS, Texas - Mark Montague remembers swimming the Comal as a kid in the 50s.

"It was good swimming above the dam. Down here it was pretty shallow," said Montague. 

He knows how dangerous just a small amount of rain can make these waters.

"The current coming over this little dam here, it's hollow inside, and it creates an undercurrent and there have been people drowned in it. I saved my younger brother from drowning down here one time when we were all swimming," said Montague. 

New Braunfels Emergency Management Director Andrew Cardiel said in total New Braunfels, only got about two inches of rain over the last few days.

But that's enough to cause him to close all public access points to the Comal River.

"There's enough debris in there could cause injuries in the river, so we try and make sure we provide safety in mind for our residence, but also for visitors, who may not be experienced in such conditions like that," said Cardiel.

Cardiel said the river has already started to recede, but until it's back to a safe level the parks will remain closed.

The Guadalupe River is still open to the public.