Data Point,Proposal A: Steel Truss Bridge,Proposal B: Concrete Box Girder Bridge,Notes
Initial Construction Cost,"$45,000,000","$60,000,000","Total upfront cost including design, materials, and labor. Proposal A benefits from modular, pre-fabricated components."
Asset Lifespan,50 Years,75 Years,The projected operational life of the bridge before requiring a complete replacement.
Annual Routine Maintenance,"$500,000","$150,000","Covers inspections, painting, de-icing, and minor repairs. Steel trusses require more frequent painting and joint inspections."
Major Rehabilitation Cost (at Year 25),"$12,000,000",$0,"A planned, one-time cost for deck replacement and structural coating for Proposal A. Not required for Proposal B within its lifespan."
Annual User Benefits (Economic),"$2,500,000","$2,800,000","Monetized value of reduced traffic congestion, fewer accidents, and lower vehicle operating costs. Higher for B due to wider lanes."
End-of-Life Salvage Value,"$1,000,000","$2,500,000",Estimated net value from recycling materials at the end of the bridge's life. Higher for concrete due to material volume.
Construction Duration,24 Months,30 Months,Estimated time from groundbreaking to opening. Concrete requires longer curing times on-site.
Discount Rate (for NPV Analysis),5.0%,5.0%,The standard rate used to evaluate the present value of future costs and benefits for both proposals.