Every day 32,850 drivers cross Big Creek on Windward Parkway and 27,760 cross Lullwater Creek on Ponce De Leon Avenue. What they almost certainly don’t know is that the two bridges, along with 105 others in 10 metro Atlanta counties, were rated structurally deficient, according to an analysis of the National Bridge Inventory by The Atlanta Journal Constitution. Sixty-eight of these bridges have structural components rated poor or worse.