Head along maddington road until it bends left, turn right at this bend, go up the hill to the end of this road (i can’t remember what its called). Park in the culdesac. There is a path to the right of the main path heading away from the reservior, this leads to a boulder wall. there are a few moderate problems. Though there are heaps of boulders in this area as well as across the reservior. if you explore you can always find something decent to boulder.