The UCA Tunnel Watch List spotlights the most important tunneling and underground construction projects in the United States, illustrating the positive impact these projects bring the public. Tunnels bring remarkable benefits to infrastructure projects, including sustainability, reliability and safety.
These 20 projects include well-known multi-billion dollar transportation projects that will eventually carry millions of people underground, as well as combined overflow sewage projects that very few people will ever see in the inside of.
2025 Tunnel Watch List
| TUNNEL | LOCATION | TYPE |
| Southeast Gateway Line - Phase 2 | Los Angeles, CA | Transit |
| Savannah River Crossing | Savannah, GA | Transit |
| Second Avenue Subway - Phase 2 | New York, NY | Transit |
| NY DEP Flushing Bay CSO | New York, NY | Wastewater |
| Sandag Del Mar Tunnel | San Diego, CA | Transit |
| US 64 Corridor K Tunnel | Polk County, TN | Highway |
| Delta Conveyance | Sacramento, CA | Water |
| Sepulveda Pass Transit Corridor Project | Los Angeles, CA | Transit |
| Red Line Blue Line Connector | Boston, MA | Transit |
| Ontario Int'l Airport and Cucamonga Station Tunnel | San Bernardino, CA | Transit |
| MWRA - Metro Water Tunnel Program | Boston, MA | Water |
| Knik Arm Highway Tunnel | Anchorage, AK | Transit |
| White Pine Pump Storage Hydropower Project | Ely, NV | Energy |
| California High Speed Rail | Los Angeles, CA - San Fransisco, CA |
Transit |
| TVA Pump Storage Hydropower Plant | Pisgah, AL | Energy |
| Houston Flood Control Tunnels | Houston, TX | Wastewater |
| West Seattle Extension | Seattle, WA | Transit |
| Ballard Extension | Seattle, WA | Transit |
| Amtrak Hub - Redevelopment | Chicago, IL | Transit |
| Eastside Transit Corridor - Phase 2 | Los Angeles, CA | Transit |
Selection Criteria
A number of factors were considered when selecting projects for the Tunnel Watch List including the cumulative benefits of the project both regionally and nationally with an emphasis on societal and environmental benefits and not just economic benefits. Geography was a factor as well as the need to help promote projects that may need funding or are particularly important to their local community, or any other reason to justify why the public needs to be aware of the need for this infrastructure.
Tunnel Watch List Selection Committee
Troy Bradshaw, SAK Construction
Kit Fleming, Michels Corp
Robert Goodfellow, Aldea Services Inc.
Greg Hallet, Amalgamated Mining & Tunneling, Inc.
Marc Harren, Michels Corp
Greg Hauser, JCK Underground Inc.
Erika Moonin, Moonin and Associates
Michael Roach, Traylor Bros. Inc.
Jim Rush, Benjamin Media
Grover Vargas, Strata Worldwide
Michael Vitale, Mott MacDonald