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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteAssess a pipeline route by comparing feasible alternatives against the same engineering, environmental, and community criteria—not by assuming the proposed alignment is already the best one. Define the project’s purpose and constraints, map the people and resources along each corridor, verify important desktop findings in the field, engage affected communities and governments, and document why the selected route is preferable and what impacts remain.
The right process depends on pipeline type, location, permits, and the decision-maker. Federal Energy Regulatory Commission (FERC) guidance is especially relevant to covered interstate natural-gas facilities; it is not a universal rule for oil pipelines, local distribution systems, offshore projects, or pipelines outside the United States.
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What a route assessment should establish
A useful assessment answers two connected questions: which routes can actually meet the project’s purpose and technical requirements, and how do the effects of those feasible routes compare? It should make the trade-offs visible to landowners, residents, agencies, decision-makers, and other interested parties.
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The company generally proposes a route. For covered interstate natural-gas facilities, FERC explains that the company proposes the route or location and the Commission examines it. The proposal is therefore a starting point for review, not proof that alternatives have been fully considered or that the route cannot change.
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A complete comparison should identify the alternatives considered, the criteria used, the evidence behind the findings, the uncertainties, and the reasons a viable option was rejected. A single composite score or map cannot by itself settle a complex decision: a low score in one category could conceal a serious local impact, and the applicable decision standard depends on the project and jurisdiction.
Step 1: Define purpose, need, and constraints
Write down what service the pipeline must provide and what the project is intended to accomplish. Then distinguish essential constraints from preferences. This prevents the analysis from comparing a proposed route only with alternatives that were never capable of meeting the stated objective.
Describe the service and operating requirements
Record the service need, pipeline size, relevant technical and operational requirements, and any known connection points or infrastructure interfaces. PHMSA identifies service needs, pipeline size, natural resources, environmental areas, population centers, and existing infrastructure among considerations in route selection. The project team should explain which factors apply to its project and how each constrains or informs routing.
Separate a requirement from a preference
Label a constraint as mandatory only when there is a defensible technical, legal, safety, or operational reason. A preference—such as a shorter construction schedule or a convenient access point—may still matter, but it should not be presented as making an alternative infeasible without an explanation. Keep a record of assumptions and have engineering, environmental, and permitting staff check that they are consistent.
- Purpose and need: the service or project objective the route must meet.
- Feasibility constraints: requirements that could rule out an option, with their basis stated.
- Comparative considerations: factors that help distinguish feasible options, such as disturbance, community effects, cost, or schedule.
Step 2: Develop alternatives that can be fairly compared
Develop more than one route where reasonable alternatives exist. Consider geographically distinct corridors as well as local adjustments that could avoid a particular wetland, cultural resource, residence, or other sensitive feature. FERC distinguishes broad route alternatives from localized variations or realignments; treating them separately can make the analysis easier to follow.
Look beyond the initial alignment
Where relevant and technically feasible, examine whether a route can use or follow existing pipeline, power-line, highway, or rail rights-of-way. Existing infrastructure may reduce the need to create a new corridor, but it does not automatically make a route environmentally or socially preferable. Check the actual conditions, nearby receptors, construction requirements, and additional disturbance for each segment.
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Keep alternatives comparable
Apply the same purpose-and-need test and comparison criteria to each option. Define the corridor width, map scale, construction assumptions, and treatment of temporary work areas consistently enough that the reader can understand the comparison. If an option is excluded, state why and identify the evidence supporting that decision. If a route is technically feasible but less attractive, do not describe it as impossible merely to avoid comparing its effects.
Do not confuse a route alternative with a mitigation measure. A different corridor is an alternative; a narrower workspace, restoration commitment, or construction timing restriction may be a measure for reducing impacts within a route. Consider both, but keep their roles distinct in the analysis.
Step 3: Set comparison criteria before ranking routes
Choose the criteria before deciding which route ranks highest. A consistent framework makes trade-offs easier to see and discourages selective emphasis on whichever factor favors a preferred route. FERC’s environmental-report guidance calls for comparing route characteristics and environmental factors, stating the advantages of the selected route, and explaining why alternatives were rejected.
| Comparison axis | Questions to answer |
|---|---|
| Purpose and need | Can the route provide the required service and meet the project objective? |
| Engineering and construction | Can it be built and operated under the stated assumptions? What constructability constraints or access needs apply? |
| Environmental resources | How does it affect water, wetlands, soils, vegetation, wildlife, protected species, air, noise, and cultural or historic resources? |
| People and land use | How are residences, population centers, landowners, community facilities, access, and existing infrastructure affected? |
| Avoidance and mitigation | Can the route be shifted to avoid a resource or concern? If not, what measures can minimize, restore, or monitor effects? |
| Economic and schedule factors | Where appropriate, what cost or timing differences matter, and do they change feasibility or only preference? |
For each criterion, say what was measured or reviewed, where the information came from, and what its limitations are. If the team uses a scoring system, show the underlying criteria and explain weighting choices rather than presenting the final number as an objective answer. Qualitative descriptions are appropriate where data are not comparable or impacts cannot be reduced responsibly to a number.
Step 4: Map resources, land use, and people along each corridor
Start with a corridor-level inventory for every alternative. The exact survey area, required permits, and level of detail are project-specific, so do not imply that one checklist or buffer applies to all routes. Use mapping to identify where further review is needed, not to claim that a desktop layer confirms conditions on a parcel.
Natural and physical resources
- Water and wetlands: identify waterbodies, wetlands, flood-prone areas, and related permitting concerns where applicable.
- Soils and terrain: note erosion-prone soils, steep or unstable terrain, and the potential for disturbance or sediment movement.
- Vegetation and wildlife: identify habitat, vegetation communities, and potentially affected wildlife, including protected species where relevant.
- Air and noise receptors: locate residences and other sensitive places where construction or operation may create concerns requiring closer analysis.
- Cultural and historic resources: identify known resources and areas where consultation or specialist review may be needed.
- Land use and infrastructure: map existing uses, roads, utilities, and other infrastructure that could affect construction or be affected by it.
Community and landowner context
Map residences, population centers, community facilities, access routes, and land uses along the alternatives. Consider who lives, works, travels, or depends on resources in each corridor, not only who owns the affected parcels. Record landowner concerns and local conditions that may not appear in agency datasets, such as seasonal access, community gathering places, or a known drainage issue.
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Map sources and dates matter. A reader should be able to tell whether a feature came from a public dataset, agency information, a field observation, or community input, and whether it was verified. Differences in data coverage or age can affect the apparent comparison between routes.
Step 5: Examine community conditions and cumulative context
Route analysis should consider people as well as natural resources. Review the communities and facilities near each alternative and the environmental burdens or infrastructure that already affect them. The purpose is to identify questions requiring closer attention, not to label a community or infer a health outcome from a map alone.
Use screening tools as a starting point
EPA’s EJSCREEN can help identify places where indicators suggest that further inquiry or outreach may be warranted. Its FAQ cautions that the tool does not quantify site-specific risk or cumulative and synergistic effects, and should not be the sole basis for agency decisions. Screening results should therefore be read alongside local knowledge, project-specific exposure analysis, and other relevant evidence.
Do not treat an indicator or index as a parcel-level finding. Explain what the screening tool can show, what it cannot establish, and what additional steps were used to understand conditions in the route area. Where available data are incomplete or the tool’s scale does not fit the question, identify that limitation and seek other evidence.
Look at overlapping burdens without overclaiming
Consider existing infrastructure and environmental conditions that may contribute to a community’s experience of a proposed project. The assessment should explain the context and the project’s incremental effects where those can be evaluated. Avoid claiming that a screening map proves cumulative harm—or proves its absence—when the tool does not measure that question.
Step 6: Engage affected people, governments, and Tribes early
Outreach is most useful before the route is treated as fixed. Invite landowners, residents, local agencies, and potentially affected Tribes to identify missing resources, local conditions, alternative alignments, and mitigation opportunities. Early engagement can reveal information a project map or public record does not contain.
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Make participation actionable
Provide maps at a useful scale and a clear way to explain a concern or suggest a change. Keep a comment log that records the issue raised, who reviewed it, the response, and any resulting route or mitigation change. If the project does not change in response, explain why. This makes public input traceable rather than a box-checking exercise.
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Tribal participation can include consultation, comments, intervention, or cooperating-agency work, depending on the project and process. Tribal governments may identify treaty rights, Tribal resources, places of cultural importance, and knowledge not available in standard datasets. FERC’s Tribal Participation Guide explains the agency’s role under NEPA; the applicable process and responsibilities depend on the federal action and project circumstances.
Do not assume that a lack of mapped information means a resource is absent. Coordinate with relevant agencies and Tribal governments in ways appropriate to the project, and respect applicable confidentiality requirements for sensitive information.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Step 7: Verify desktop analysis with fieldwork and specialist review
Desktop maps and published datasets are efficient screening tools, but they cannot establish every on-the-ground condition. Use field investigations and specialist review where needed to resolve uncertainties that could affect route selection, impact estimates, permits, or mitigation.
Target fieldwork to decision-relevant questions
Prioritize locations where alternatives differ materially, the data are uncertain, or a sensitive resource or community concern could change the route decision. Depending on the setting, this may involve ecological or cultural surveys, engineering review, agency coordination, or further geospatial analysis. The scope should reflect the project and applicable requirements rather than copy another project’s methods mechanically.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteA FERC environmental impact statement for the Plaquemines/Gator Express project describes conclusions informed by field investigations, literature research, geospatial and alternatives analysis, comments, and agency and Tribal coordination. That is an example of methods used in one review, not a universal checklist or a promise that every project uses identical investigations.
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Document uncertainty honestly
For each important finding, state whether it is based on mapped data, direct observation, an agency record, or stakeholder information. Identify gaps that could change the comparison and explain how they were handled. If field access was unavailable or a survey was incomplete, do not imply the area was fully verified; identify the limitation and its implications for the decision.
Step 8: Avoid impacts first, then specify mitigation
When a route could affect a sensitive resource or community, first test whether a different corridor or local realignment can avoid the impact. If avoidance is not practicable, explain why and identify measures to minimize, restore, or monitor the remaining effects. Environmental review considers effects, alternatives, mitigation, and public involvement; the details depend on the project and permitting context.
Make mitigation specific and verifiable
For each measure, identify the impact it addresses, who is responsible, when the measure applies, and how implementation or compliance will be checked. Distinguish commitments that are definite from ideas still under consideration. Where restoration or monitoring is proposed, describe what will be observed and how a problem would be identified and addressed.
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- Show the route change or design adjustment considered for avoidance.
- Explain why an impact remains if it cannot be avoided.
- Connect each mitigation measure to a specific impact and location.
- Identify responsibility and a means of checking implementation.
- Record unresolved effects and uncertainty instead of implying that mitigation removes all impact.
Step 9: Publish a comparison people can audit
A defensible route comparison should be understandable without requiring readers to reconstruct the analysis from scattered maps and technical appendices. Present route maps at a useful scale, identify data sources and dates, summarize effects consistently, and explain both trade-offs and uncertainty. Make the record of public input and agency coordination discoverable.
Use a consistent alternative-by-alternative summary
For each route, summarize whether it meets purpose and need, its principal construction considerations, affected environmental and community resources, opportunities for avoidance, remaining impacts, and relevant cost or schedule factors. Use the same categories for each alternative. Where an effect cannot be quantified or compared directly, say so and explain the basis for the qualitative conclusion.
Explain selection and rejection
State the selected route’s advantages and its disadvantages. For each viable alternative not selected, explain the reasons for rejection using the criteria disclosed earlier. A route may perform better on one axis and worse on another; show those trade-offs rather than compressing them into a claim that one route is simply “best.” The decision-maker must apply the standard relevant to the project and jurisdiction.
Keep the evidence trail intact
Keep route versions, map layers, assumptions, comments, agency communications, field findings, and design changes organized so a reviewer can trace how evidence affected the analysis. Disclose source dates and note where a dataset may not represent current conditions. When a route changes, identify what changed and update affected comparisons rather than leaving earlier maps to imply that the alignment is unchanged.
Jurisdiction and guidance: confirm what applies to the project
Permits and review roles vary with pipeline type, location, resource area, and project design. FERC is the lead federal agency for covered interstate natural-gas infrastructure, but its process should not be generalized to every pipeline. Other agencies may have permitting or consultation roles tied to particular resources or locations. Determine the relevant decision-makers and requirements for the project before describing a process as mandatory.
For current FERC environmental materials, consult the agency’s environmental-guidelines index, which was last updated June 30, 2025, and verify that the relevant manuals and procedures remain applicable to the project. Requirements and guidance can change; a prior project’s review is not a substitute for checking the rules that govern the present one.
Quick Recap
Common mistakes that weaken a route assessment
- Comparing only the preferred route with a no-build or implausible option: include reasonable, feasible alternatives and explain any exclusions.
- Choosing criteria after seeing the results: establish the framework before ranking and disclose it.
- Using a score as a substitute for judgment: show underlying evidence, trade-offs, uncertainty, and the applicable decision standard.
- Treating screening maps as site-specific proof: use them to guide inquiry, then verify important findings with appropriate evidence.
- Counting only environmental features: include residents, landowners, community facilities, access, and existing burdens.
- Consulting people after the route is effectively settled: invite input early enough for it to inform alternatives and mitigation.
- Describing mitigation as elimination of impact: specify residual effects and how measures will be implemented and checked.
- Borrowing another project’s methods as a universal rule: distinguish illustrative examples from requirements applicable to the project.
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