Why bother with FDOT when you can figure it out in google maps?This bridge is structure # 930545, maintained by FDOT.
You probably can get information about the basic geometry of the structure contacting them, some details may be withheld in order to avoid crazy people to damage the structure, but I'm sure length and width is available, anyone can take a measuring device and find out so it would be silly to make that secret.
Your labels are pretty close to how they code them nation wide. Spans are numbered west to east, standing on the end bent #1 by the west approach, then pile bent #2, 3, 4... . up to end bent #9. Then each pile is labeled from left to right, just like your sketch. That way if you refer to pile 8-1 everyone would know is the one at the top right, or pile 1-8 is at the bottom left, would come handy if anyone tells you there's a whatever by a particular pile.
Interesting enough, the fishing pier on the west is about the same length.