This area is maintained, but not prepared as nor offered as a “park”. It is open when the spillway is closed; closed because of high water when the spillway is open. It is a quiet, pleasant little spot that many people like to fish from and a great place to picnic or swim.
The entrance is a road next to and on the west side of the spillway (not the generating station). Take the entrance (below left) and follow it back, bearing to the left. You’ll come to the end, where a hairpin turn takes the road back up the river a little way.