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Lake Mead Intake

Lake Mead is the largest reservoir in the United States in terms of water capacity. It serves as the main water supply for the residents and tourists of the iconic city of Las Vegas. The Colorado River, which brings water to the area, is flowing less forcefully because of a severe, multi-year drought resulting in the water level of Lake Mead dropping 110 feet since 2000, leaving it at half capacity.

90%
Southern Nevada鈥檚 water comes from Lake Mead
25,000,000
People in Nevada, Arizona, and California supplied by Lake Mead water
3
Awards for Excellence in Tunneling and Engineering

Overview

The Lake Mead Intake No. 3 Program is intended to protect the existing water system capacity of the Southern Nevada Water Authority (SNWA) against potential inoperability of the existing intakes. It also enables better quality water to be drawn from a deeper elevation/location in the lake, and brings clean water to more than two million people in southern Nevada.

The project was one of the most technically challenging in the industry because of the very complex geological conditions. It required tunneling under water pressure that was so extreme, it had never been done before. The intake structure itself was located 377 feet deep in the middle of the lake.

Technical Highlights

The project included design and construction of the following structures:

  • 15,000-蹿辞辞迟-濒辞苍驳听intake tunnel bored in rock with cover ranging from 587 feet (at launch) to about 30 feet upon entering the intake structure
  • Custom dual-mode, slurry shield tunnel boring machine designed to withstand聽17 bars聽of water pressure or聽40,000 gallons聽per minute.
  • 30-foot聽finished diameter,聽611-foot聽deep access shaft
  • Stub Tunnel from the access shaft at a depth of聽400 feet聽that is聽83.5 feet聽long from shaft to bulkhead
  • 202-foot-long聽Tunnel Boring Machine launch chamber at the bottom of the shaft
  • 85-蹿辞辞迟-濒辞苍驳听IPS-X connection stub tunnel and back-shunt tunnel
  • 360-foot-long, 26-foot聽horseshoe TBM tunnel

Significant Marine Works Include:

  • 11,000聽of tremie concrete placed underwater
  • 48,000 CY聽of material excavated underwater
  • In-house design and engineering
  • Preservation of endangered wildlife within a national park

RECOGNITION

  • 2016 Outstanding Civil Engineering Achievement Award, American Society of Civil Engineering (ASCE) Finalist
  • 2016 Tunnel Achievement Award for Project Excellence (Tunnel Business Magazine)
  • 2015 Global Tunneling Project of the Year (over $500 million), Tunneling & Underground Space Awards