Dear Sir,
I'm structural engineer with 6 years experience mostly in structural engineering, but also I have experience with short bridges (span up to 25 meter).
I don't know which is type of your structure, but in my project always it's be prestressed concrete beams, so will be good if you can send me your drawings.
Also I must know is it project scool assignment or real project, because if is scool assignment we can agrees less price, but I must see drawings how I can estimate duration of work.
Sincerely,
Vahidin Alibegovic, B.Eng.Civ.