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Interstate 11 Corridor Tier I Environmental Impact Statement

The initial I-11 and Intermountain West Corridor Study was completed in 2014. This allowed Interstate 11 (I-11) efforts to move to the next phase, with projects and studies continuing in both Arizona and Nevada.

Arizona is continuing the process through a Tier 1 Environmental Impact Statement (EIS) Study to potentially identify a Selected Corridor Alternative between Nogales and Wickenburg, Arizona.

The next major milestone for this study is the publication of the Final Tier 1 Environmental Impact Statement and Preliminary Section 4(f) Evaluation during the summer of 2021. That document will outline a Preferred Corridor Alternative and the No-Build Option for this proposed highway. The Final Tier 1 EIS will include a 30-day public review period.

The Record of Decision, which will include the Selected Corridor Alternative or the No-Build Option, is expected to be published before the end of 2021. This will mark the end of the Tier 1 EIS Study.

The I-11 Draft Tier 1 Environmental Impact Statement and Preliminary Section 4(f) Evaluation (Draft Tier 1 EIS) was completed and made available for public review and comment from April 5, 2019 through July 8, 2019. All comments and questions received during the comment period will be addressed in the Final Tier 1 EIS, expected to be completed and available for review in 2021. The Recommended Corridor Alternative from the Draft Tier 1 EIS can be accessed via this satellite view map.

Comments on the Draft Tier 1 EIS Study can be made at any time during the study process. For more information, visit the Contact Us page.

In Nevada, the Regional Transportation Commission of Southern Nevada (RTC) led the effort to complete I-11 from US-95 to US-93 near the Hoover Dam Bypass Bridge, approximately 12.5 miles (Phase 1), while the Nevada Department of Transportation (NDOT) constructed the portion of I-11 from Railroad Pass to US-95, approximately 2.5 miles (Phase 2). Both phases were built simultaneously beginning in the spring of 2015 with construction completed in 2018.

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