The United States is in the middle of the largest bridge construction and rehabilitation cycle in a generation. According to the Federal Highway Administration's National Bridge Inventory, 42,966 bridges are classified as structurally deficient as of the 2025 reporting cycle, and the Infrastructure Investment and Jobs Act (IIJA) has injected $40 billion in dedicated bridge funding through the Bridge Formula Program and the Bridge Investment Program. That money is now hitting the ground — and the numbers tell a different story than the political talking points suggest.
Through Q1 2026, states have obligated approximately $24.8 billion of the $27.5 billion Bridge Formula Program allocation, with $18.2 billion in active construction contracts. The Bridge Investment Program has awarded an additional $12.4 billion across 85 large-scale projects. Combined with state and local matching funds, the total bridge construction pipeline in the United States exceeds $58 billion in active or imminent projects. For general contractors, steel fabricators, concrete suppliers, and specialty bridge builders, this represents a once-in-a-career market opportunity — but one that requires understanding which projects are moving, where the bottlenecks are, and how the competitive landscape is shifting.
The Mega-Bridge Projects: $500 Million and Above
The highest-profile bridge projects in the country are the mega-projects — those exceeding $500 million in total construction cost. These projects dominate headlines, consume enormous quantities of materials, and create multi-year demand for specialized labor in their regions.
The Francis Scott Key Bridge Replacement (Baltimore, Maryland) is arguably the most watched bridge project in the country. Following the catastrophic collapse in March 2024, the Maryland Transportation Authority fast-tracked the replacement design. The new bridge carries an estimated construction cost of $1.7 to $1.9 billion, with the Army Corps of Engineers completing channel debris removal in 2024 and foundation construction beginning in mid-2025. The replacement design features a cable-stayed main span of approximately 1,600 feet with a minimum 215-foot vertical clearance — significantly higher than the original truss bridge. As of early 2026, foundation caisson installation is underway, with completion targeted for late 2028. The project is employing an estimated 3,500 to 4,000 construction workers at peak activity, with Kiewit-Flatiron Joint Venture leading the construction management.
The I-5 Columbia River Bridge (Portland, Oregon to Vancouver, Washington) is advancing through final design with an estimated construction cost of $6 to $7.5 billion — making it the most expensive bridge project in the nation. The Interstate Bridge Replacement Program completed its Record of Decision in late 2024, and early construction activities including utility relocation and staging area preparation began in 2025. The main bridge construction contract is expected to be awarded in late 2026, with a completion target of 2032. The project replaces the existing twin truss spans built in 1917 and 1958 with a new multi-modal crossing incorporating light rail, enhanced seismic resilience to Cascadia Subduction Zone standards, and improved river navigation clearance.
The Brent Spence Bridge Corridor Project (Cincinnati, Ohio to Covington, Kentucky) received a $1.6 billion IIJA Mega grant — the largest single grant under the program. Total project cost is estimated at $3.6 billion. Construction began in 2024 with approach roadway and utility relocation work, and main bridge construction is underway as of early 2026. The project builds a new companion bridge immediately west of the existing Brent Spence Bridge, which will be rehabilitated to carry local traffic while the new bridge handles interstate through-traffic. The double-deck design serves both I-71 and I-75 traffic, and the construction consortium is led by Walsh Construction and Kokosing.
The Gold Star Memorial Bridge Complex (New London-Groton, Connecticut) is a $1.5 billion reconstruction of the twin I-95 bridges over the Thames River. The Connecticut DOT awarded the design-build contract in 2025, with major construction mobilization underway.
The I-10 Calcasieu River Bridge (Lake Charles, Louisiana) carries a price tag of $2.1 billion and replaces a structurally deficient bridge that has been a bottleneck on the Gulf Coast I-10 corridor for decades. The Louisiana DOTD is advancing the project under a public-private partnership (P3) model, with financial close expected in 2026.
The $100 Million to $500 Million Tier
Below the mega-projects, a robust pipeline of major bridge projects ranging from $100 million to $500 million is where the bulk of IIJA bridge dollars are flowing. These projects are large enough to require sophisticated construction management but accessible to a broader range of general contractors.
Notable projects in this tier include the I-83 Bridge over Susquehanna River replacement (Harrisburg, Pennsylvania) at $380 million, the US-51 Ohio River Bridge (Wickliffe, Kentucky to Cairo, Illinois) at $275 million, the I-55 Chain of Rocks Bridge rehabilitation (St. Louis, Missouri) at $190 million, the SR-520 Floating Bridge Phase 2 (Seattle, Washington) at $310 million, and the I-40 Bridge over Canadian River (Oklahoma City, Oklahoma) at $165 million.
State DOTs are also advancing hundreds of bridge replacement and rehabilitation projects in the $10 million to $100 million range. According to AGC of America's 2026 construction outlook survey, 68% of bridge contractors reported backlogs at or above historic highs, with average backlog duration extending to 14.2 months — up from 11.8 months in 2024. This backlog pressure is driving bid prices higher, with ENR's bridge construction cost index showing a 7.2% year-over-year increase through Q4 2025.
Bridge Construction Methods and Technology Trends
The current bridge construction cycle is notable not just for its scale but for the accelerating adoption of advanced construction methods. Several technology trends are reshaping how bridges are built across the country.
Accelerated Bridge Construction (ABC) methods are now standard practice on the majority of federally-funded bridge projects. The FHWA's Every Day Counts initiative has driven widespread adoption of prefabricated bridge elements and systems (PBES), slide-in bridge construction, and geosynthetic reinforced soil-integrated bridge systems (GRS-IBS). According to FHWA data, approximately 42% of bridge projects initiated in 2025-2026 incorporate at least one ABC technique, up from 28% in 2020. The benefits are compelling: ABC methods typically reduce on-site construction time by 50 to 70%, minimize traffic disruption, and improve construction zone safety for both workers and motorists.
Ultra-High Performance Concrete (UHPC) has moved from experimental to mainstream in bridge construction. UHPC, with compressive strengths exceeding 22,000 psi compared to 4,000 to 6,000 psi for conventional concrete, enables thinner deck sections, longer spans, and dramatically improved durability. The FHWA reports that UHPC connections between prefabricated bridge deck panels have been used on over 350 bridges nationwide as of 2025, with adoption accelerating. For contractors, UHPC requires specialized mixing, placing, and curing procedures, creating both a barrier to entry and a competitive advantage for firms that invest in the capability.
Weathering Steel and High-Performance Steel (HPS) grades are increasingly specified for steel girder bridges, reducing long-term maintenance costs and enabling longer spans with lighter sections. HPS 70W and HPS 100W steels, with yield strengths of 70 and 100 ksi respectively, allow engineers to design more efficient sections that reduce steel tonnage requirements by 15 to 25% compared to conventional Grade 50 steel. For steel fabricators, these higher-strength steels require more precise fabrication controls and modified welding procedures.
Digital twin technology and Building Information Modeling (BIM) are becoming contractually required on major bridge projects. The FHWA's Digital Construction initiative is pushing state DOTs to require 3D/4D models for bridge construction, enabling real-time progress tracking, clash detection during erection sequencing, and as-built documentation. Major bridge projects like the Key Bridge replacement and the Brent Spence Corridor are requiring contractor-developed digital twins that integrate with owner asset management systems.
Materials Supply Chain: Steel and Concrete Dynamics
The bridge construction boom is creating significant demand pressure on key construction materials, particularly structural steel and high-performance concrete.
Structural steel for bridge construction is experiencing extended lead times. According to the American Institute of Steel Construction (AISC), fabrication lead times for bridge plate girders extended to 32 to 40 weeks in Q1 2026, up from 24 to 30 weeks in 2024. The primary bottleneck is not raw steel production but fabrication shop capacity — skilled ironworkers, welders, and quality control inspectors are in short supply. FMI Capital Advisors estimates that bridge steel fabrication demand will exceed domestic shop capacity by 8 to 12% through 2028, pushing some projects toward international fabrication with domestic final assembly.
Ready-mix concrete supply is generally adequate in most markets, but specialty concrete — including UHPC, self-consolidating concrete (SCC), and high-early-strength mixes — faces sporadic shortages due to limited specialty admixture availability and the concentration of production capability among a few suppliers. Contractors on bridge projects should plan for 8 to 12 week lead times on specialty concrete mix designs requiring performance testing and approval.
Prestressing strand and post-tensioning hardware have seen price increases of 18 to 22% since 2024, driven by strong demand from both bridge construction and the broader infrastructure market. Insteel Industries and Sumiden Wire Products, the two primary domestic producers, have both announced capacity expansions, but new production capacity won't come online until late 2027.
State-by-State Activity: Where the Bridge Work Is
Bridge construction activity varies dramatically by state, driven by the intersection of infrastructure condition, federal funding allocation, and state matching fund availability.
The states with the highest bridge construction spending in 2025-2026 based on federal obligation data and state DOT capital programs include Pennsylvania with $3.2 billion in active bridge projects (the state has 3,353 structurally deficient bridges — more than any other state), New York with $2.8 billion driven by the MTA's bridge rehabilitation program and Thruway Authority projects, California with $2.6 billion focused on seismic retrofit and replacement of bridges that don't meet current Caltrans earthquake standards, Ohio with $2.1 billion anchored by the Brent Spence project plus hundreds of smaller replacements, and Texas with $1.9 billion spread across the state's massive highway system.
The IIJA funding is now past the halfway mark, and bridge spending represents one of the strongest performing categories in the federal infrastructure pipeline. States that were slow to obligate bridge funds in 2022-2023 have accelerated dramatically, with obligation rates exceeding 90% in most states for Bridge Formula Program allocations through fiscal year 2025.
What This Means for Your Crew
If you're running a bridge construction or rehabilitation operation, the market fundamentals are as strong as they've been since the Interstate Highway System era. But the opportunity comes with challenges that require strategic planning.
Workforce is the binding constraint. AGC's 2026 workforce survey found that 78% of bridge contractors report difficulty filling hourly craft positions, with ironworkers, pile drivers, and certified welders the most difficult to find. Firms that invest in training and retention — particularly apprenticeship programs and competitive benefits packages — will have a structural advantage in pursuing work.
Equipment utilization rates are at historic highs. Crane rental companies report utilization rates of 85 to 92% in major bridge construction markets, up from 72 to 78% historically. This means planning crane mobilization 6 to 9 months in advance for major lifts, and considering equipment purchases rather than rentals for firms with sustained backlogs.
Bonding capacity is the gatekeeper for project access. The mega-projects and large bridge replacements require bonding capacity that limits competition to the largest contractors and joint ventures. Mid-size firms should focus on the $10 million to $100 million segment, where competition is less concentrated and bonding requirements are more accessible. Subcontracting relationships with the major primes on mega-projects can also build the performance history needed to grow bonding capacity over time.
Early material procurement is essential. Given the extended lead times for structural steel fabrication, prestressing strand, and specialty concrete, successful bridge contractors are procuring materials at award — not at the start of the relevant construction phase. This requires working capital and supply chain relationships that smaller firms may need to develop.
Regional Demand Forecast: Where to Position
Looking at the pipeline of bridge projects entering design and permitting phases, several regions will see intensifying bridge construction demand through 2028-2030.
The Mid-Atlantic corridor (Pennsylvania, New York, New Jersey, Maryland) will remain the highest-volume bridge construction market, driven by the region's aging infrastructure stock and strong state DOT budgets. The state DOT budgets hitting record levels trend is particularly pronounced in this region, where toll revenue and dedicated infrastructure funding sources provide reliable capital program funding.
The Gulf Coast (Texas, Louisiana, Mississippi, Alabama) is emerging as a major bridge market, driven by both IIJA-funded interstate bridge replacements and energy-sector industrial access bridge construction. Hurricane resilience upgrades to coastal bridges represent an additional demand driver.
The Pacific Northwest (Oregon, Washington) will see concentrated demand driven by the I-5 Columbia River Bridge and seismic upgrade programs, though permitting and environmental review timelines can create unpredictable project schedules.
Frequently Asked Questions
How many structurally deficient bridges are in the United States?
As of the 2025 National Bridge Inventory reporting cycle, 42,966 bridges in the United States are classified as structurally deficient, meaning at least one major component — the deck, superstructure, or substructure — has been rated in poor condition (rated 4 or below on the NBI 0-9 scale). This represents approximately 7% of the nation's 617,000 bridges. Pennsylvania leads the nation with 3,353 structurally deficient bridges, followed by Iowa with 4,571 (many are smaller rural bridges), and Illinois with 2,374. The IIJA Bridge Formula Program is specifically targeted at reducing this backlog, with states required to dedicate a proportion of their allocation to structurally deficient bridges.
What is the largest bridge construction project in the US right now?
The largest bridge construction project by estimated cost is the I-5 Columbia River Bridge between Portland, Oregon and Vancouver, Washington, with an estimated total cost of $6 to $7.5 billion. However, the project is still in the pre-construction phase, with the main bridge construction contract expected to be awarded in late 2026. Among projects currently in active construction, the Francis Scott Key Bridge Replacement in Baltimore at $1.7 to $1.9 billion and the Brent Spence Bridge Corridor Project at $3.6 billion are the largest, with foundation and approach construction underway on both projects.
How does IIJA bridge funding work?
The IIJA provides bridge funding through two primary programs. The Bridge Formula Program distributes $27.5 billion by formula to all states based on their share of bridge needs as measured by the cost to rehabilitate or replace structurally deficient bridges and the cost to preserve bridges in fair condition. States receive their allocation annually over five years (FY2022-2026) and can use the funds for any bridge project on any public road. The Bridge Investment Program provides an additional $12.5 billion on a competitive grant basis, available for large bridge projects (over $100 million), mid-size bridge projects ($50 to $100 million), and bridge planning and bundled projects. Both programs require state or local matching funds, typically at a 20% match rate, though economically disadvantaged communities may qualify for up to 100% federal funding.
What trades are most in demand for bridge construction?
The trades experiencing the highest demand in bridge construction include ironworkers (structural and reinforcing), pile drivers, certified structural welders (particularly those qualified for fracture-critical welding on bridge steel), crane operators (both mobile and tower crane), concrete finishers with bridge deck experience, and heavy equipment operators qualified on deep foundation drilling rigs. The Bureau of Labor Statistics reports that employment of structural iron and steel workers is projected to grow 4% from 2024 to 2034, but industry demand in bridge construction is growing at roughly 8 to 10% per year through the IIJA funding period, creating a significant supply-demand gap.
What to Watch
The bridge construction market will remain robust through at least 2030, but several factors could shift the trajectory. First, watch for reauthorization signals — the IIJA's five-year authorization period ends after FY2026, and Congressional action on a successor bill will determine whether the current funding levels are sustained, increased, or allowed to revert to lower baseline levels. Second, the Buy America requirements under IIJA are creating supply chain complexity for bridge steel and components — watch for enforcement actions and waiver requests that could signal bottlenecks. Third, interest rate trends will affect the viability of P3 bridge projects that rely on toll revenue bonds — lower rates improve project economics and could unlock additional mega-projects. Finally, keep an eye on the construction spending forecast of $2.1 trillion in 2026, which will determine whether bridge construction competes with other sectors for the same limited pool of skilled labor and materials.
