The son, who also worked in the mine until five months ago, said: "They use posts and beams here instead of steel arches.
The giant steel arches were floated into place on scows.
The steel arches were each 169.4 m long and were unusually high.
This has required some drastic solutions using steel arches and several feet of shotcrete.
The great steel arch was supported upon two huge bases of stone.
The road deck is in the form of a curve and is supported by a steel arch.
The fiberglass and steel arch has just been finished.
Other support measures could include steel arches, rockbolts and mesh.
The green steel arches makes the bridge one of the most recognizable in Ottawa.
The design of the main span features a steel arch.