Projects and Initiatives

I-11 Boulder City Bypass2020-11-03T10:49:13-08:00

I-11 Boulder City Bypass

Boulder City Bypass Project Map

I-11 opened for drivers in Summer 2018. It saves drivers approximately 30 minutes when traveling from Hoover Dam Bypass Bridge to Henderson, bypassing Boulder City.


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

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