Foreground to background:
Liberty Bridge (high bridge with traffic)
Panhandle Bridge (light rail bridge with train)
Smithfield Street Bridge (high blue arch)
Fort Pitt Bridge (high yellow arch)
West End Bridge (yellow trusses in far distance)
All the bridges are over the Monongahela River in Pittsburgh except the West End Bridge which is over the Ohio River.
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Looks like the Liberty Bridge, Smithfield Street Bridge and Fort Pitt Bridge to me! (And a teeny bit of the West End Bridge) Ok, I'm not sure what #5 would be :)