[clamboat]

Sunshine Skyway Bridge = Length 29,040 feet
(I think it is the 2nd largest bridge in the USA)
The largest one in the USA would be Chesapeake Bay Bridge-Tunnel,
Cape Charles, Virginia = total length = 89,760 feet

There have to be more qualifiers on that record. Maybe you mean the 2nd longest suspension bridge. The bridge over Lake Pontchatrain near New Ortleans is 26 miles long. I don't even think that is the longest.

[ET(end tyranny)]

World's Longest Bridge Spans

[stlnative]

Here is where I got my info... but I did not go deep into the website.
Building Big
It is a pretty cool website full of facts. Let me know what you find out. :-)