This guide outlines cost ranges in USD and provides practical budgeting guidance for common bridge types. Bridge projects vary by span, loading, and site conditions. Typical residential-to-municipal spans range from 20 to 100 feet, with per–square–foot costs commonly between $100. Steel, truss pointer pipe bridges. Exclusive:treating and dumping cost of contaminated ground;exploratory trench excavation;provisions for underground infrastructure;walkway on. Medium roadway bridge: 16–52 weeks; 2,500–6,000 labor hours. erection labor, deck pricing, bolts, paint, waste, and how to build a bid that actually makes money. Erection. Columns on some of the wide tables may be not be visible. cfm. Buyers typically pay a broad range for a bridge, with large variances driven by span, material, location, and permitting.