Headed there with our RV on Thursday for 4 nights. I know the park sits on the "original" channel of the Colorado River at its confluence with the Gulf of Mexico but is there any freshwater at all in that channel or is it all salt/brackish? I believe they have one or two fishing piers on the river channel and one on the Gulf. Any fishing tips for that location or nearby? Haven't really done much fishing in the salt, only charter boat type outings.