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Tunnel Boring Machine

The Tunnel Boring Machine (TBM) consists of a cutter head with an outside diameter of 42.3 feet (as high as a 4 story building) and a 361 foot long trailing support gear made up of 6 gantries.  The total length of the TBM is 428.5 feet long (more than a football field).  It is the largest diameter soft ground tunneling boring machine in the United States.

Tunnel Boring Machine

The Tunnel Boring Machine (TBM) arrived at PortMiami on June 23, 2011.  The TBM components were delivered to Watson Island launching shaft area, which included heavy components, trailing gear and spare parts via barge and trucking.  Assembly of the TBM, working from front to back (shield first, then gantries), was completed by the end of October 2011.  After testing, and nicknamed “Harriet” by the Miami-Dade County Girl Scouts Troops, Harriet launched from her home in the Watson Island pit on November 11, 2011, boring the first tunnel towards Dodge Island.

Tunnel Boring Machine Breakout at Dodge Island

July 31, 2012 marked a historical  moment and major milestone for the project as well as Miami-Dade County and the community when “Harriet” the Tunnel Boring Machine emerged at PortMiami


Mining of the Eastbound Tunnel began on November 11, 2011 and was completed on July 31, 2012 (751 Rings & 4,186 LF). Harriett was partially disassembled to make the turn on Dodge Island and was reassembled, recommissioned and began tunneling the westbound tunnel on October 29, 2012. Mining of the Westbound Tunnel was completed on May 6, 2013 (745 Rings & 4,152 LF). Each Tunnel consists of two 12' travel lanes, 2'-6" Shoulders on both sides and 2'-2" Maintenance Walkway. The Tunnel Boring Machine was disassembled and removed from the work site.

Watson Island

Parrot Jungle Trail and MacArthur Causeway have been moved south to provide room for the tunnel boring machine (TBM) and the tunnel opening for traffic in and out of the port. The new Parrot Jungle Trail and eastbound causeway lanes are shown on the right and the ongoing construction work is taking place in the median.

MacArthur Causeway Bridge

The MacArthur Causeway Bridge is currently being widened to add one new lane in each direction. The two left lanes in each direction will separate tunnel traffic from through traffic and direct it in and out of the tunnel openings, or portals. Construction began November 2010.

PortMiami – Dodge Island

The rebuilding of the bridge and roadways at PortMiami, located on Dodge Island began in December 2010. Westbound and Eastbound Port Boulevard was shifted to create room for the tunnel and equipment. Construction continues on the internal roadway system on Dodge Island and will continue until 2014.

Cross Passages

Construction of the cross passages inside the tunnels are underway. There will be a total of five (5) cross passages between each tunnel to provide access during an emergency and/or for maintenance.

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Port of Miami Tunnel Project

The Port of Miami Tunnel (POMT) project is currently being built by MAT Concessionaire, LLC, in partnership with the Florida Department of Transportation (FDOT), Miami-Dade County and the City of Miami.

By connecting SR A1A/MacArthur Causeway to Dodge Island, the project will provide direct access between the seaport and highways I-395 and I-95, create another entry to the Port of Miami besides the Port Bridge, and keep the Port of Miami, the community’s second largest economic generator, competitive.

Additionally, The POMT will improve traffic flow in downtown Miami by reducing the number of cargo trucks and cruise related vehicles on congested downtown streets, and will aid ongoing and future development in and around downtown Miami.

This site is a resource to answer your questions and keep you up-to-date on the most recent activities and information regarding the POMT. Take a moment to explore the site, sign up to receive information and feel free to contact us with your questions and/or comments.


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the Port of Miami

Florida Department of Transportation

Toll Free- 1-866-513-7623

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Liz Fernandez, MOT Public Information Specialist

Mobile/Direct: (786) 502-0704|E-mail:

Kathy McLendon, FDOT Construction Public Information Project Manager

Phone: (305) 640-7437|E-mail:

Maribel Lena, District Public Information Officer

Phone: (305) 470-5349|E-mail: