Q: If I specify a grid reinforced concrete deck, how long can I expect it to last? A: Grid reinforced concrete bridge decks have been in operation since the 1930’s. The 10th Street Bridge in Pittsburgh was opened to traffic in 1932 utilizing one of the earliest forms of a grid reinforced deck. At the time of its rehabilitation in 1981, an inspection revealed that the deck was in excellent condition. Now, at more than 75 years old, the deck is still performing after enduring heavier truck traffic and de-icing chemicals for most of its service life. There are several other structures in existence with grid reinforced concrete decks with service lives now beyond 50 years.