Built in the mid-1960s, the Riverside Drive Parking Deck in ...

Built in the mid-1960s, the Riverside Drive Parking Deck in Elgin, Illinois, is quite large. Approximately 1,000-ft (300-m) long by 60-ft (18-m) wide – and nearly all of it over the Fox River – the deck is built on hundreds of ‘piles’, large concrete cylinders pushed down into the muddy river bottom. Pre-cast elements in the piles used high-tensile steel wire for reinforcement, and that steel is now rusting. A trail-sized piece of the deck has even fallen into the river causing concern to local authorities.

About the Riverside Drive Parking Deck, what can NOT be concluded?