Today I did something I always wanted to try....I drove along Chattahoochee River Rd above Helen as far as I could until I reached a closed gate and had to turn around. It looks like the entire length is around 19 miles but I didn't even make it 10 before I reached the gate. Can you not drive all the way through? It's possible I got off on a side road....I had to cross the river at one point (not on a bridge) and ended up in a campground. Also, is the river stocked up there in the wilderness? I don't know how a stocking truck could make it all the way up there unless it's stocked further up the road where it rejoins 75.