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Steel and prestressed concrete girders can both be sound choices for a highway bridge; neither is universally cheaper or better. As a first screen, the Federal Highway Administration (FHWA) says prestressed concrete girders often cost less on shorter spans, while steel beams are typically less costly on longer spans. The right choice depends on which alternatives are feasible for the actual span arrangement, what they cost at the project location, and how their maintenance and other lifecycle costs compare.
That guidance is a tendency, not a span cutoff or a project-specific recommendation. Owners and design teams should compare feasible alternatives using itemized local estimates and the same lifecycle assumptions, then account for site conditions, owner requirements, aesthetics, and environmental concerns.
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At a glance
| Name | Best fit tendency | Key consideration | Checked |
|---|---|---|---|
| Prestressed concrete girders | Often a least-cost option on shorter spans | Maximum permissible span depends on the girder and project; feasibility must be checked | November 2026 |
| Steel beams or girders | Typically less costly on longer spans | Compare the specific steel design, exposure, detailing, and any coating or weathering-steel requirements | November 2026 |
These are FHWA’s broad screening tendencies, not a ranking or a substitute for a project estimate. The cited guidance provides no universal break-even span.
What is the basic cost difference between steel and prestressed concrete girders?
The broad cost tendency changes with span: prestressed concrete girders often provide the least-cost option on shorter spans, while steel beams are typically less costly on longer spans. FHWA states this in its LRFD Highway Bridge Superstructures Reference Manual, section 2.3.4.3.
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“In shorter span bridges, prestressed concrete girders often provide the least cost option, while in longer span bridges, steel beams are typically the less costly option.”
The qualifiers matter. “Often” and “typically” describe a screening pattern; they do not guarantee which material will have the lower bid for a particular bridge. The manual gives no universal span length where the cost advantage switches. Treating its qualitative guidance as a numeric rule could eliminate a viable option or create false confidence in an early budget.
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It is therefore useful to separate three questions that are sometimes blurred together: which systems can satisfy the design requirements, what each feasible alternative is expected to cost initially, and how the owner expects maintenance and other lifecycle costs to compare. A material may look attractive on one of these dimensions and less attractive on another. The decision should make those trade-offs visible rather than reducing them to a single material price.
How should a project team compare the alternatives?
Start by developing feasible alternatives, then compare them consistently. FHWA describes preliminary cost comparison as an itemized estimate for each superstructure type and span arrangement, and says the selection should also consider maintenance and other complete lifecycle costs.
- Set the project requirements. Establish the required span arrangement and the owner’s governing criteria, site constraints, and performance needs. Record relevant owner preferences, aesthetic considerations, and environmental concerns rather than treating them as afterthoughts.
- Screen for geometric and design feasibility. Identify candidate girder types and sizes for each arrangement. Check whether each can satisfy the project’s actual geometry and loading under applicable design requirements. Do not assume that every material option can span every proposed distance.
- Prepare separate itemized estimates. Estimate each feasible superstructure and span alternative using quantities and prices appropriate to the construction location. Keep assumptions visible so the team can see what drives differences and update estimates as the design develops.
- Compare lifecycle costs as well as initial cost. Include the owner’s relevant long-term maintenance and other lifecycle assumptions. FHWA puts the point plainly: “Other considerations for alternative superstructure materials should include long-term effects of maintenance costs and other complete life-cycle costs.” A first-cost advantage alone does not establish the lower-cost choice over the bridge’s life.
- Document the decision and its uncertainties. State which options were feasible, what cost and lifecycle assumptions were used, and how owner or site factors influenced the choice. Revisit the comparison if the span arrangement, design, local prices, or project requirements change.
This process does not require pretending the comparison is more precise than the inputs. Where the estimates or lifecycle assumptions are uncertain, show the uncertainty and identify which assumptions would change the decision. The available FHWA guidance supports a method, not a precomputed winner.
For an apples-to-apples comparison, the alternatives should be described at comparable levels of development. If one option has a defined girder type, span arrangement, and itemized estimate while the other is only a placeholder allowance, the apparent difference may reflect the maturity of the estimates rather than a true cost advantage. Keep the underlying assumptions alongside the totals so reviewers can distinguish confirmed quantities and prices from estimates that may change.
A simple decision record can be organized around the same questions for every candidate: Is it feasible under the project geometry and governing design criteria? What span and girder arrangement was evaluated? What project-location estimate supports the initial-cost comparison? What maintenance and lifecycle assumptions were applied? Which owner, aesthetic, environmental, or site requirements influenced the outcome? This structure helps an owner explain why an option was selected and what would warrant reopening the decision.
Do not force a winner when the alternatives are close or the inputs are uncertain. The guidance does not provide a general savings percentage or tie-break rule. In that situation, document which assumptions matter most and update the comparison as the project definition and local cost information improve.
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Why does span length matter?
Span is an early screen because it can affect both feasibility and relative cost. FHWA says prestressed concrete girders have a maximum permissible span length that may limit their use on longer spans; the applicable limit is not one universal number for every girder type and project.
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A proposed span should therefore prompt two separate questions: can the candidate girder system meet the project’s design requirements, and what does that feasible alternative cost compared with other feasible arrangements? A broad statement about shorter or longer spans answers neither question for a specific bridge. The design team must evaluate actual geometry, loading, girder type, and spacing.
FHWA’s prestressed concrete girder design example illustrates why this is a design exercise rather than a material-label decision. Its workflow assumes a girder size based on span and spacing, calculates loads and load distribution, determines prestress losses, and checks service, strength, flexure, and shear. It is an example of the analysis involved, not a shortcut for selecting a girder or a substitute for current project criteria.
The same practical discipline applies when looking at a steel alternative: evaluate the specific candidate system against the project’s geometry, loading, and governing design requirements. A general statement that steel is typically less costly on longer spans does not establish that a particular steel arrangement is feasible, or that it will be the least-cost option after the full estimate is assembled.
Span arrangement also belongs in the comparison, not just a single span length considered in isolation. FHWA’s preliminary comparison method calls for estimates for each superstructure type and span arrangement. If a team evaluates more than one arrangement, it should keep those alternatives distinct and avoid comparing a cost total from one arrangement with a materially different arrangement as if only the girder material changed.
What should the cost estimate include?
Compare alternative-specific, itemized estimates—not just a price for steel versus concrete. FHWA’s guidance calls for estimates for each superstructure type and span arrangement, with costs reflecting the final construction location.
For a useful comparison, the owner and estimator should make clear which quantities, work items, pricing assumptions, and design arrangements are included in each estimate. The alternatives should be developed to comparable levels of definition: an estimate for one fully considered design is not fairly compared with a rough allowance for another. Keep the basis of estimate available for review and revision as the project develops.
Ask whether the estimates use the same project scope and comparable assumptions. If they do not, record the differences before drawing a cost conclusion. A comparison that isolates the girder price while leaving other included work or assumptions inconsistent can misstate the relative cost of the alternatives. The itemized format is valuable precisely because it lets the team inspect what is included rather than relying on a headline total.
The available data’s sources do not provide current local bid prices or a universal cost table. Consequently, no credible general dollar figure or savings percentage can be supplied here. Project costs should come from the actual alternatives and locally grounded estimates, not an old estimate presented as a current bid price.
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For a decision that will be revisited, retain the date and basis of the estimate and identify which local inputs need updating as the project advances. A past estimate may still help explain a prior decision, but it should not be represented as a current bid price without current support. Nor should a published cost from another location be carried over as though construction conditions and pricing were identical.
How should maintenance and durability affect the choice?
Maintenance and other lifecycle costs belong in the comparison, but material stereotypes do not. The available guidance does not support saying that prestressed concrete is maintenance-free or that all steel girders need painting. The actual details, exposure, owner requirements, and maintenance assumptions matter.
For a steel option using uncoated weathering steel, evaluate whether the exposure and detailing suit that material. FHWA’s guidance on uncoated weathering steel cautions that unsuitable exposure conditions or poor detailing can lead to distress and emphasizes the material’s limitations. That is a specific consideration for weathering-steel applications, not a claim that every steel bridge has the same coating or maintenance regime.
Make the comparison explicit: identify the maintenance activities and costs assumed for each design, the timeframe or lifecycle basis required by the owner, and any uncertainties. If those assumptions are not supported by project or owner information, do not present a lifecycle-cost conclusion as settled.
“Lifecycle cost” should not be used as a label to make an unsupported preference sound definitive. FHWA recommends considering long-term maintenance and other complete lifecycle costs, but its guidance here does not declare a universal lifecycle-cost winner. The project team needs to state what owner-approved assumptions it used and apply them consistently to the alternatives. If the available information cannot support a detailed comparison, say so and distinguish the known initial estimate from the unresolved long-term considerations.
For weathering steel in particular, the question is not simply whether the material is called uncoated. FHWA’s guidance makes exposure suitability and detailing relevant to performance. A project should evaluate those conditions and the specific design rather than assume weathering steel is appropriate everywhere—or infer from those cautions that every steel girder requires the same treatment.
What other project factors can govern?
Cost and span feasibility are central screens, but they are not the only selection criteria. FHWA identifies owner preference, aesthetics, and environmental concerns as factors that may govern the choice of superstructure material.
These factors should be treated as project inputs, not as automatic advantages of either material. For example, an owner may have requirements or preferences that affect acceptable details; aesthetic or environmental priorities may also shape the alternatives. State the requirement and its effect on the decision rather than assigning an unsupported numerical benefit.
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That distinction matters during early planning. It is reasonable to ask whether the project has a documented constraint involving fabrication, erection, or schedule, but not to assume that the answer favors steel or concrete without project evidence. Keep those items as questions to resolve with the owner and project team, not as general material claims.
Likewise, aesthetics and environmental concerns may affect a real selection, but they do not produce an automatic score for either alternative. Identify the owner’s stated preference or project requirement, explain how it applies to the candidate designs, and avoid inventing a numerical benefit where none has been established.
Which design should a highway project choose?
Choose the option that is feasible for the required geometry and performs best against the project’s evaluated costs and requirements—not the one that wins a generic material comparison. FHWA’s shorter-span/longer-span cost tendency is a useful first screen, but it cannot determine the outcome without the project’s alternatives, local estimates, lifecycle assumptions, and owner criteria.
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A defensible recommendation should identify the feasible span and girder arrangements considered; compare their itemized costs using local inputs; include long-term maintenance and other lifecycle costs; and explain how owner preferences, aesthetics, environmental concerns, and relevant site conditions affected the result. If prestressed concrete cannot meet the project’s span or other design requirements, it is not a feasible candidate regardless of a general cost tendency. If both systems are feasible, the project comparison—not a blanket rule—should decide.
For a short-span project, the FHWA tendency makes prestressed concrete a sensible candidate to evaluate early, not a foregone conclusion. For a longer-span project, the tendency makes a steel alternative worth serious consideration, while the feasibility and cost of all candidate arrangements still need to be checked. In either case, the team should retain any viable alternative long enough to compare it on the same scope and assumptions rather than eliminating it solely from a generic rule of thumb.
The recommendation should also be conditional on its inputs. If local costs, design geometry, owner requirements, or lifecycle assumptions change materially, the preferred option may change too. A clear record of the evaluated alternatives and assumptions makes that sensitivity understandable to decision-makers without pretending the initial comparison is permanent.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which design references should engineers check?
Use technical references as support for competent project design, not as a replacement for current governing specifications or owner criteria. FHWA’s LRFD Steel Girder Superstructure Bridge Designers’ Guide is a design reference and cautions that information may change; users should verify its accuracy and appropriateness before finalizing designs and special provisions.
AASHTO lists the LRFD Bridge Design Specifications, 10th Edition as a 2024 publication for bridge design, evaluation, and rehabilitation, with updates to concrete and steel sections; the listing reports September 2025 errata. Confirm the edition, errata, governing specifications, and applicable owner requirements for the actual project before relying on a reference.
For additional study, Routledge lists Narendra Taly’s Highway Bridge Superstructure Engineering: LRFD Approaches to Design and Analysis and Tim Huff’s LRFD Bridge Design: Fundamentals and Applications, which covers steel and concrete I-girders. These are optional technical references, not substitutes for project-specific engineering or current criteria.
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These references serve different purposes: the FHWA material offers design guidance and worked design context, while the AASHTO specification listing identifies a formal specification edition. A reference or worked example should not be treated as the project’s current governing requirement by default. Engineers must confirm the applicable edition, errata, special provisions, and owner criteria for the bridge under consideration.
Students and practicing engineers seeking deeper instruction may find the Routledge titles useful as optional study texts on highway superstructure design and LRFD methods. They are specialized references rather than a universal purchasing recommendation; verify that a book’s scope suits the reader’s needs. Neither a textbook nor a general guide supplies a project’s local estimate or makes the owner’s selection decision.
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Is there a standard span length where steel becomes cheaper than prestressed concrete?
The cited FHWA passage does not give a break-even span. The relative cost depends on the feasible girder and span arrangements, design requirements, and project-location estimates.
Does choosing a prestressed concrete girder mean the bridge will need no maintenance?
No. The cited guidance calls for considering maintenance and complete lifecycle costs for alternatives; it does not say prestressed concrete is maintenance-free. Use the owner’s and project team’s supported assumptions for the actual design.
Does every steel highway bridge need a protective coating?
The available sources do not establish one coating rule for every steel design. In particular, FHWA’s weathering-steel guidance addresses uncoated weathering steel and warns that suitability depends on exposure and detailing; apply the relevant owner requirements to the specific alternative.
Can a design example determine which girder material my project should use?
No. A design example demonstrates analysis steps for a particular system and assumptions. A project choice still requires current criteria, actual geometry and loads, feasible alternatives, local estimates, and lifecycle evaluation.
Should an owner compare only the cost of the girder material?
No. FHWA describes itemized estimates for each feasible superstructure type and span arrangement, with costs tied to the construction location. The comparison should also account for maintenance and other lifecycle costs, rather than relying on a material price alone.
The Bottom Line
Bottom line: FHWA’s screening guidance points to prestressed concrete as a frequent least-cost candidate on shorter spans and steel as a typically less-costly option on longer spans, but it sets no universal break-even point. Compare feasible designs with itemized local estimates, consistent lifecycle assumptions, and the owner’s actual requirements before choosing.
