Yes there is a small bridge and a little path that goes in between loop 800 and 700. You can't take a golf cart or bike because it's a dirt path really for the dog walk. So, that folks staying on the 700 loop can walk their dogs along the canal on the 800 loop. It's near the front of loop 800 (maybe near site 820?) The little walk way comes out in between two campsites on the 700 loop and it is a marked path. I have seen some kids riding their bikes on it- yikes!
Anyway just walk along the canal on the 800 loop towards the beginning of the loop and you'll see it. Or if on loop 700 look for the designated dog walk path.