Concrete Bridge Design and Iron Calculation

I need a professional to assist me in building a concrete bridge with a length of 474 cm. The bridge will be subjected to loads crossing over wood.

Key Requirements:
- Calculate the amount of iron needed for the construction.
- Design the bridge without specific standards or codes, but ensuring it is structurally sound.
- Use a standard concrete mix for the project.

Ideal Skills:
- Civil Engineering expertise with a focus on bridge design.
- Strong understanding of structural load distribution.
- Proficiency in material calculation and cost estimation.

Freelancers with prior experience in similar projects will be given preference. Please include samples of your previous work in your proposal.