I don't know where "River Road" is (other than TX because you posted it) but I would guess that if you object to the price, then it's time to find a different place to go.
I've pretty much taken state parks out of my choice of places to stay. I think they have just gotten too high priced for what is usually a W/E site, especially once you add in all the extra fees. They are looking more like a KOA (Keep On Adding) with all the "extra" fees.
You may want to look into a Passport America or Happy Camper membership. Those are both half off (from overnight to up to a week) for what is often a full hookup site.