the tom `diver` derrick bridge, commonly referred to as the `diver` derrick bridge, is an opening single-leaf bascule bridge.

adelaide architecture background bascule bay beautiful blue botany bridge building coast color commonly concrete construction crossing derrick diver engineering famous frame harbour highway iron landmark landscape light metal modern nature nsw ocean opening outdoor over overpass port referred river rivet road scenic sea singleleaf sky southern span steel strength strong structure support tom tourism transportation travel view water