Pedernales Falls
Pedernales Falls State Park is located along the Pedernale River in Blanco County east of Johnson City. It is prone to variable water levels. A sign at the state park shows a relatively tranquil river in one picture and a raging wall of muddy water in the next picture, said to be taken only five minutes after the first. The speed at which flash floods can arise along this river has resulted in several deaths at the park, and warning sirens have been installed in the park and elsewhere along the river. -from Wikipedia
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