I-11 Boulder City Bypass

 Project Overview

Las Vegas and Phoenix are the only two cities in the nation with populations of more than one million people that are not currently linked by an interstate. Once constructed, the first phase of Interstate 11 will relieve congestion, improve safety, and enhance travel and commerce between Arizona and Nevada. Construction of the project will create an estimated 4,000 direct, indirect, and induced jobs in the region, which currently has one of the highest unemployment rates in the nation.




  • Using Fuel Revenue Indexing (FRI) and federal funds, the RTC is developing 12.5 miles of Interstate 11.
  • Las Vegas Paving was awarded the design-build contract for Phase 2 of the project in January 2015.
  • Construction on both phases began in Spring 2015 and is expected to be complete in 2018.

Stay up-to-date with the project by visiting: i-11nv.com


The first phase of I-11 will construct approximately 15 miles of new freeway around the southern and eastern perimeter of Boulder City from I-515 to US-93.  The project will include the design and construction of a four-lane access-controlled freeway with a new interchange at US-95 and a reconfigured interchange at the US-93/SR-172 Hoover Dam Exit. Major project elements will include extensive rock excavation, nine bridges, a scenic view parking area overlooking Lake Mead, drainage culverts and environmental mitigation.  A portion of the project will be constructed through a ridge of the El Dorado Mountains.

The Final Environmental Impact Statement was completed in 2005 and a Record of Decision was received.  Following the release of a technical paper identifying the presence of naturally occurring asbestos in the project area in Fall 2013, the RTC and NDOT conducted an Environmental Re-evaluation.  The re-evaluation was completed and NDOT and the RTC received a second Record of Decision from the Federal Highway Administration in December 2014 to continue work on the project.

The U.S. Congress, with its passage of the Moving Ahead for Progress in the 21st Century Act (MAP-21) in 2012, designated the planned freeway between Las Vegas and Phoenix as the Future I-11.  This project will be the official start of the I-11 freeway between Las Vegas and Phoenix.

Naturally Occurring Asbestos (NOA)

Independent environmental engineering firms obtained and tested rock and soil samples from both NDOT Phase 1 and RTC Phase 2 project areas at depths ranging from ground level to more than 200 feet below the surface.  Samples were tested to determine if NOA was present and, if so, where it occurs and at what levels.

Naturally Occurring Asbestos Fact Sheet
Naturally Occurring Asbestos FAQ’s
Phase 1 – NDOT Naturally Occurring Asbestos Final Report

I-11 Boulder City Bypass Final Environmental Impact Statement Re-Evaluation

Phase 2 Report

Phase 2 – Geologic Evaluation, Sampling, and Testing for Naturally-Occurring Asbestos (96 MB)

Phase 2 – Appendix B through H (12 MB)

Phase 2 – Attachment 1 (12 MB)


TEM data sample locations (Part 1 of the Phase 2 work)

PLM data sample locations (Part 2 of the Phase 2 work)

Note: Northings & Eastings in above files are in Universal Transverse Mercator coordinate system