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Start with the crossing, not the material
A bridge material should be selected after the owner and engineer define the crossing’s demands. A short rural bridge with generous crane access has a different answer from a longer urban span over a busy highway, even if both carry the same traffic. FHWA states that material selection, design details and construction practices can have significant life-cycle cost implications for bridge maintenance. Its best-practice advice is to select materials that can provide the intended service life with a reasonable level of preventive-maintenance effort.
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The engineer of record and the approving highway agency control the final design. U.S. and North American practice generally uses the AASHTO LRFD Bridge Design Specifications, 8th Edition identified by FHWA for design, evaluation and rehabilitation of fixed and movable highway bridges, together with the state or local amendments adopted by the authority. Ask which edition and amendments govern before comparing bids.
Steel and concrete at a glance
| Decision factor | Steel | Concrete |
|---|---|---|
| Structural weight | Lower self-weight can reduce foundation reactions and make long or staged erection practical. The advantage must be checked against the actual span, girder depth, fatigue and seismic demands. | Greater mass can simplify some vibration and fire-resistance considerations, but increases dead load and foundation reactions. |
| Fabrication and erection | Members can be fabricated under controlled shop conditions and delivered for rapid erection, subject to haul-route, crane and field-connection limits. | Precast elements can also shorten site work where a capable producer is nearby; cast-in-place work needs formwork, reinforcement, placement and curing time. |
| Traffic staging | Short erection windows can reduce lane closures when transport and crane access are available. Temporary works and connection sequencing still govern the schedule. | Precast can support staged construction; cast-in-place concrete may require longer occupation of the site and protection during curing. |
| Durability risks | Corrosion concentrates at wet details, joints, drains, connections and coating defects. Coatings may need periodic renewal. | Cracking, chloride ingress, freeze-thaw damage and reinforcing-steel corrosion control service life. Good mix design, placement and curing are essential. |
| Routine maintenance | Drainage and joints must be kept functional; inspections look for coating breakdown, section loss, pack rust, fatigue details and inaccessible wet areas. | Inspections focus on cracks, delamination, spalls, deck wear, joints, leakage and evidence of reinforcement corrosion. |
| Supply and approvals | Requires qualified fabricators, welders, inspectors, coating facilities and transportation capacity that meet the agency’s specifications. | Requires an approved concrete supplier or precaster, reinforcement and placement crews, and the agency’s accepted concrete and curing details. |
This table is a screening tool, not a design. A material that looks economical in one row can create a larger cost or risk in another.
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How span, loads and foundations change the answer
Span and girder depth
Required span and available structural depth are often the first technical filters. Steel’s high strength-to-weight ratio can make a slender girder arrangement attractive where the roadway profile leaves little depth or where a longer clear span avoids a pier in the channel. Its lower dead load can also reduce bearing, abutment and foundation reactions. Those benefits must be verified with the bridge’s design vehicle, pedestrian loading, fatigue category, seismic demand, wind effects and deflection limits.
Concrete’s mass can be advantageous where a deeper superstructure is acceptable and a conventional slab, beam or box arrangement fits local construction practice. A heavy superstructure may, however, increase seismic forces, bearing loads and the size of foundations. Geotechnical results, not a material preference, determine whether those reactions are acceptable.
Water, scour and geotechnical conditions
Flood level, channel geometry, scour depth and water chemistry affect both materials and foundations. A crossing that can be built without a pier in the active channel may reduce scour exposure and permitting complexity, regardless of whether the superstructure is steel or concrete. The owner should obtain design flood elevations, anticipated debris, scour evaluation, groundwater conditions and foundation recommendations before fixing a span arrangement.
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Fatigue, seismic and movement demands
Steel details must be checked for fatigue under repeated truck or bus loading, especially at welded attachments, connections and abrupt geometry changes. Concrete requires checks for cracking, shrinkage, creep, prestress losses where applicable and reinforcement development. Seismic bearings, restrainers and foundation demands can change the apparent weight advantage of steel. Wind, thermal movement and braking forces affect both systems and should be evaluated under the governing AASHTO and agency criteria.
Construction speed and traffic staging
When steel can shorten the site window
Steel girders or trusses can be fabricated while foundations are being built. If a haul route can handle the pieces and a crane or launching system can reach the site, erection may occur during a short road closure or nighttime window. This is especially useful where detours are long, emergency access must remain open or a bridge crosses an operating highway or railway.
“Fast erection” is not automatic. Shop drawing review, welding inspection, coating cure, transportation permits, utility clearances, crane mats, weather limits and field-bolt or weld sequencing all affect the critical path. A small local project can lose the expected advantage if the nearest suitable fabricator is far away or if oversized loads require a lengthy route.
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Where precast or cast-in-place concrete fits
Precast beams, slabs or box sections can offer a similarly short installation window when a qualified plant and lifting equipment are close to the crossing. Repetition, standardized sections and local DOT details can lower coordination risk. Transport limits, piece weights, bearing tolerances and closure requirements still need a project-specific plan.
Cast-in-place concrete allows unusual geometry and can use local labor, but it requires forms, reinforcement placement, concrete delivery, consolidation, finishing and curing. Cold, hot or wet weather can affect placement and the time before traffic is allowed. Accelerated mixes or temporary protection may help, but they add specification and quality-control requirements.
Compare the complete traffic plan
Require each option to show the same work-zone assumptions:
- Number and duration of lane or road closures.
- Detour length, emergency-access provisions and pedestrian routing.
- Crane or pump positions, temporary supports and utility protection.
- Haul route restrictions, delivery timing and police or escort needs.
- Weather-sensitive activities and float for curing, coating or erection.
- Temporary flood protection and the consequences of a high-water event.
User delay and temporary works belong in the economic comparison. A lower bid can be more expensive to the community if it causes a long closure or a high-probability schedule overrun.
Durability in wet, salty and freezing environments
Steel corrosion is usually a detail and drainage problem
FHWA’s Service Life Design Reference Guide (2022) notes that corrosion in steel bridges is often highly localized and tied to the performance of the drainage and joint system. Water that leaks through a failed deck joint, remains on a flange or collects behind a connection can cause serious section loss even when the surrounding steel appears sound.
Steel protection may include a paint system, galvanized components, weathering steel in suitable exposure, sealed details and planned drainage. Protective coatings can require occasional renewal. The owner must budget for access, containment, surface preparation, recoating and traffic control; otherwise the intended service life may not be achieved.
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Concrete durability depends on crack and moisture control
Concrete is not maintenance-free. Chlorides from marine air, spray or deicing salts can penetrate pores and reach reinforcing steel. Once reinforcement corrodes, expansive rust can cause cracking, delamination and spalling. FHWA explains that service-life models assume cracking is controlled through structural measures, mix design, placement and curing. Freeze-thaw cracking can accelerate chloride-induced corrosion by opening paths for water and salts.
Specify exposure classes, air entrainment where required, an appropriate water-cementitious-material ratio, supplementary cementitious materials when suitable, adequate cover, proper consolidation and curing. Detail slopes, drips, joints and deck drainage so water leaves the structure rather than entering cracks or leaking onto substructure elements.
Marine and deicing exposure
Neither material should be selected from a generic “coastal” or “cold climate” label. Determine chloride concentration, wetting frequency, splash zones, prevailing winds, deicing practice, freeze-thaw cycles and industrial pollutants. A coated steel option with robust drainage may outperform poorly detailed concrete; highly durable concrete with protected reinforcement may outperform steel where coating access is difficult. The exposure-specific design and maintenance plan decide the outcome.
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Uncoated weathering steel develops a protective oxide only when the environment allows repeated wetting and drying without persistent contamination or saturation. FHWA Technical Advisory 5140.22 (1989) advises caution in marine coastal areas, locations with frequent high rainfall or persistent fog, industrial chemical exposure, tunnel-like grade separations and low-level water crossings.
The advisory gives screening figures of 10 feet over stagnant, sheltered water and 8 feet over moving water. It also advises caution when yearly average time of wetness exceeds 60 percent. These are screening guidance, not a substitute for a corrosion and structural design review. Measure the actual clearance, flood behavior, splash and drainage conditions at the proposed crossing.
Where uncertainty remains after site evaluation, the advisory says engineering judgment should lean toward coated steel. Even a weathering-steel bridge needs reliable deck-joint seals, positive drainage, inspection access and removal of dirt or vegetation that traps moisture.
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Maintenance obligations by material
Steel maintenance plan
FHWA’s corrosion-prevention guidance specifically calls for controlling roadway drainage, cleaning or resealing deck joints, maintaining deck-drainage systems, removing dirt and vegetation that retain moisture, and inspecting for corrosion. Add these tasks to the owner’s asset-management schedule:
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- Close inspection of suspected section loss, pack rust, cracking or fatigue-sensitive details.
- Cleaning of drains, scuppers and deck surfaces before blocked flow creates a wet pocket.
- Joint repair before leakage reaches beam ends or substructure concrete.
- Coating-touch-up and full-recoat decisions based on measured condition, access and containment cost.
- Vegetation and sediment removal around abutments and under the deck.
Concrete maintenance plan
- Inspect decks, parapets, beams, columns and abutments for cracks, delamination, spalls and exposed reinforcement.
- Track crack width, leakage and changes over time rather than treating every crack as equivalent.
- Repair failed joints and drainage paths so water does not saturate concrete or wash chlorides into cracks.
- Remove loose concrete safely and repair with materials compatible with the existing substrate and exposure.
- Evaluate corrosion activity when staining, delamination or half-cell or other diagnostic results indicate reinforcement distress.
- Protect repaired areas and maintain deck wearing or waterproofing systems where specified.
Inspection frequency and methods are set by the owner’s inspection program and governing regulations. Budget for access equipment, traffic control and qualified inspectors for either material.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Lifecycle cost: why a generic “cheaper” answer is unreliable
No directly comparable national steel-versus-concrete cost or service-life statistic establishes which material is cheaper for every local crossing. Initial prices vary with span, geometry, labor rates, steel and cement markets, haul distance, foundations, traffic control, coatings, precast availability and agency details. A one-time low bid is not a lifecycle comparison.
Build a project-specific model with at least these cash-flow and risk items:
| Cost category | Questions to quantify |
|---|---|
| Initial construction | What are the superstructure, substructure, bearings, joints, drainage, barriers, coatings, concrete protection and temporary-works costs? |
| Construction impacts | How much do closures, detours, escorts, crane setup, haul-route improvements and flood protection cost? |
| Inspection and access | What equipment, lane closures, under-bridge access and specialist inspections are required? |
| Preventive maintenance | When will cleaning, joint sealing, coating touch-up, deck sealing or concrete protection occur, and at what local prices? |
| Major interventions | What is the expected timing and cost of recoating, deck replacement, concrete repair, bearing replacement or joint reconstruction? |
| Failure and delay risk | What is the consequence of corrosion, leakage, cracking, a flood event, material delivery delay or an unplanned closure? |
| End-of-life and residual value | Can components be reused or recycled, and what demolition, disposal and traffic costs are likely? |
Use the local agency’s bid history and maintenance records, then test optimistic, expected and adverse scenarios. Include the cost of user delay where a maintenance action requires a closure. Discount rates, analysis period and residual value should be agreed with the owner rather than assumed from a generic online calculator.
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Supply, approvals and contractor capability
A technically attractive material can become the riskier choice if the local supply chain is weak. For steel, verify fabricator certification, welding procedures, nondestructive testing, coating-shop capacity, inspection staffing, transport permits and erection equipment. For concrete, verify approved aggregates and cementitious materials, batch-plant reliability, precast-bed capacity where relevant, reinforcement fabrication, placement crews and curing protection.
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Ask the approving agency whether it has standard details, preferred joint and barrier systems, approved coating systems, concrete exposure requirements or restrictions on weathering steel. Confirm who is responsible for shop drawing review, material certifications, field inspection and acceptance testing. The engineer of record must reconcile the selected material with environmental permits, geotechnical findings and local construction law.
A practical material-selection process
- Define the crossing. Record clear span, roadway and sidewalk width, vertical clearance, alignment, design life and any requirement to keep traffic, fish passage or emergency access operating.
- Establish design actions. Provide design vehicle and pedestrian loads, seismic and wind criteria, braking forces, fatigue demands, flood levels, debris and thermal movement requirements.
- Investigate the site. Obtain geotechnical data, groundwater and water chemistry, scour analysis, chloride and deicing exposure, freeze-thaw history and evidence of industrial pollutants.
- Map construction constraints. Check crane and pump locations, haul routes, overhead utilities, staging space, property limits, lane-closure windows, detours and seasonal flood conditions.
- Confirm local capability. Obtain written availability and lead times from qualified steel fabricators, coating shops, precasters, concrete suppliers, erectors and inspection firms.
- Develop at least one feasible steel and one feasible concrete scheme. Keep span, clearances, barriers, traffic assumptions and performance requirements equivalent so the comparison is fair.
- Prepare durability details. Show deck slopes, drains, joints, splash-zone protection, crack-control measures, cover, curing, coatings and inspection access for each scheme.
- Price the lifecycle. Use local bid and maintenance data for initial work, inspections, preventive tasks, major repairs, closures and residual value. Document assumptions and sensitivity to uncertain items.
- Review with the authority. Confirm the governing AASHTO LRFD edition, state amendments, environmental permits, standard details and acceptance requirements.
- Select and document the material. Record why the chosen option meets structural, construction, durability, maintenance and budget objectives, and identify the tasks and funding needed to preserve its service life.
Which option fits common local scenarios?
Short crossing with nearby precast production
Concrete may be attractive when standard precast sections, local hauling and a familiar erection crew keep the schedule predictable. Check piece weights, road access, bearing seats, joint leakage and freeze-thaw or chloride detailing before deciding.
Longer span with a narrow closure window
Steel may offer an advantage if shop fabrication and a planned lift can place the superstructure quickly. Confirm crane reach, transport permits, wind limits, field connections and coating protection; otherwise the theoretical schedule benefit may disappear.
Low-level crossing in a wet or foggy setting
Do not assume bare weathering steel is suitable. Apply the FHWA screening cautions, measure clearances and wetness, and obtain a corrosion review. A coated steel or concrete design with deliberate drainage may be more robust.
Remote site with limited maintenance access
Compare the consequence of transporting coating equipment or concrete-repair materials to the site. A material that needs specialized access every few years may be less practical than one that can be inspected and repaired with locally available equipment.
Urban crossing over a busy road
Value traffic staging, night work, delivery routes and user delay explicitly. Either steel erection or precast concrete can work, but the preferred option is the one with a credible, permitted sequence and contingency for weather and utility conflicts.
Questions to take to the engineer and owner
- Which AASHTO LRFD edition and state or local amendments govern this bridge?
- What clear span, profile, scour depth and foundation reactions are required?
- What are the measured chloride, deicing, freeze-thaw, wetness and water-chemistry conditions?
- Can local fabricators, precasters, inspectors and erectors meet the required schedule and quality specifications?
- What maintenance access, inspection frequency and traffic control will each option require?
- Does the weathering-steel screening support an uncoated design, or is coated steel the prudent choice?
- What local bid history and maintenance records support the lifecycle assumptions?
- What happens if a joint leaks, a coating fails, a flood delays work or a major repair requires a closure?
The final selection should be a documented engineering and asset-management decision, not a rule that one material is always cheaper, faster or longer-lived. Steel and concrete can both deliver the intended service life when their exposure, details, construction quality and maintenance obligations are matched to the crossing.
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