Anybody ever fished up and down the arroyo river down in the lower Laguna madre. Wondering if anyone knows how and where to catch snook and tarpon down in there. Thank you in advance.

Tarpon? Nope
Snook? There's a few
Trout reds and flounder are world class

Tarpon yes and snook yes. Mainly small ones in the river. And if I told everyone where I fished I would be out of a job.

I've hooked a few juvenile tarpon around three islands but certainly nothing to think about trying to catch one on purpose.
But I'll take your word.

up in the river is where you will find them almost every day in the summer time.

They are definitely in the Arroyo.