Unfortunately, generally the salary range for structural engineers is large if you are talking about all of the different industries a structural engineer can work in. I agree with TehMightyEngineer's median, but maybe a little larger spread - 70-85k - and I think the range of salaries for someone with your credentials in the midwest will be 55k-95k, depending on your industry and niche. Structural engineers actually practicing structural engineering are employed by specialty consulting firms, multidisciplinary consulting firms, contractors, municipalities, state and federal governments, manufacturing facilities, and large companies in a support role overseeing maintenance and upgrades to facilities, for example. Each industry pays differently.
The low end of the salary range is offered by municipalities and state jobs.
The middle range will be offered by consulting firms for buildings and bridges.
The high end of the salary range will be offered by large contractors and industries associated with fossil fuels (oil refineries, natural gas plants, etc). I knew fresh graduates working at oil refineries making 90k.
Be sure to ask about bonuses when receiving an offer. Ask what the last couple of years were like for someone in your position in terms of bonuses received. I wouldn't expect receiving a bonus to make ends meet or accepting one job over the other, but it's nice to know the possibilities. Some small to medium firms regularly give 10-30% bonuses during good profitable years. In my experience, large companies are fickle in their bonus structure and most of the time bonuses are reserved for those in management or senior roles.