| Subject/Title |
Resource URL |
| Title 23: Highways |
| Chapter 1 – Federal-Aid Highways, Sec. 109 – Standards |
23 U.S.C. 109 |
| 23 CFR Part 771 Interim Final Rule (July 3, 2025) |
Interim Final Rule |
| Environmental Impact and Related Procedures |
23 CFR 771 |
| Preamble to the Regulation on Environmental Impact and Related Procedures (March 24, 2009) |
Preamble |
| Preamble to the Regulation on Environmental Impact Statements and Related Documents (August 28, 1987) |
Preamble |
| Procedures for Abatement of Highway Traffic Noise and Construction Noise |
23 CFR 772 |
| Parks, Recreation Areas, Wildlife and Waterfowl Refuges and Historic Sites (Section 4(f)) |
23 CFR 774 |
| Mitigation of Impacts to Wetlands and Natural Habitat |
23 CFR 777 |
| Establishing Discipline and Accountability in the Environmental Review and Permitting Process for Infrastructure Projects |
E.O. 13807 |
| Expediting Environmental Reviews and Approvals for High Priority Infrastructure Projects |
E.O. 13766 |
| Environmental Stewardship and Transportation Infrastructure Project Reviews |
E.O. 13274 |
| Subject/Title |
Resource URL |
| Fixing America’s Transportation (FAST) Act |
| In-Depth Questions and Answers on the changes to 23 U.S.C. § 139 as they relate to FHWA, FRA, and FTA projects – SUPERSEDED BY: THE REVISED SECTION 139 GUIDANCE |
Q&A – SUPERSEDED |
| Questions and Answers on the Applicability of 23 U.S.C. § 139 to FHWA, FRA, and FTA Projects |
Q&A |
| Changes to 23 U.S.C. §§ 326 and 327 through Implementation of Sections 1307 and 1308 of the Fixing America's Surface Transportation (FAST) Act |
Memorandum |
| Categorical Exclusion for Projects of Limited Federal Assistance |
Guidance |
| Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (SAFETEA-LU) |
| Environmental Review Process Final Guidance – SUPERSEDED BY: Section 139 Efficient Environmental Reviews for Project Decisionmaking and One Federal Decision Interim Final Guidance |
Guidance – SUPERSEDED |
| Section 139 Efficient Environmental Reviews for Project Decisionmaking and One Federal Decision |
| Section 139 Notice of Availability |
Notice of Availability |
| Section 139 Efficient Environmental Reviews for Project Decisionmaking and One Federal Decision Interim Final Guidance |
Guidance |
| Section 139 Environmental Impact Statement (EIS) Process Chart |
EIS Process Chart |
| Section 139 Environmental Assessment (EA) Process Chart |
EA Process Chart |
| Other Guidance |
| Clarifying Fiscal Constraint Guidance |
Memorandum |
| Guidance on Financial Planning and Fiscal Constraints for Transportation Plans and Programs |
Memorandum |
| Guidance on Purpose and Need |
Memorandum |
| NEPA Re-Evaluation Joint Guidance for FHWA, FRA, & FTA |
Guidance |
| Interim Guidance on the Application of Travel and Land Use Forecasting in NEPA |
Guidance |
| TECHNICAL ADVISORY (T 6640.8A): Guidance for Preparing and Processing Environmental and Section 4(f) Documents |
Guidance |
| The Development of Logical Project Termini |
Guidance |
| Additional Flexibilities in Developing Categorical Exclusions (May 2017) |
Memorandum |
| Additional Flexibilities in Developing Categorical Exclusions (June 2018) |
Memorandum |
| The Importance of Purpose and Need in Environmental Documents |
Guidance |
| Guidance on FHWA Prior Concurrence Procedures for EISs |
Guidance |
