The Don River has an especially deep ravine, cutting off the east of the city at most points north of the lakeshore. This was addressed in October 1918, when the construction of the Prince Edward Viaduct, was finalized, linking Bloor Street on the western side of the ravine with Danforth Avenue on the east. The designer, Edmund Burke, fought long and hard to have a lower deck added to the bridge for trains, a cost the city was not willing to provide for. Nevertheless, he finally got his way, and thereby saved the city millions of dollars when the Toronto Transit Commission (TTC) subway started using the deck in 1966.