Thornton Composite Reservoir

CTLGroup was engaged by Walsh to provide mass concrete consulting, mix design consulting, and a thermal control plan for tunnel plugs in the Deep Tunnel project. The tunnel plugs were 28 ft. in diameter and 44 ft. long. In other sections of the tunnel our team evaluated concrete mix-designs and made changes to improve pumpability for use in a 2000 ft. slickline. This was done while addressing shrinkage and thermal concerns. CTLGroup’s expertise allowed our client to complete important stages of the deep Tunnel project.


Water and WasteWater

Consulting Services

Concrete + Cement-Based Materials

Concrete Mixture Development & Qualification

Mass Concrete & Thermal Control

Rheology, Pumpability, and Constructability

At 2,480 feet long and 1,580 feet wide, the Thornton Composite Reservoir is the world's largest combined sewer overflow facility.

Key experts on this project

7.9 B



Project Completion

3.8 B

Project Cost

Learn more about this project

Project Detail Form

Project Detail Form