US-based DC Water has announced that the Herrenknecht tunnel boring machine (TBM) named Lady Bird has been lifted to the surface after completing a 7km tunnel as part of the Clean Waters project in Washington DC.
TBM Lady Bird, named after environmentalist and former first lady Claudia Alta Taylor Johnson, was launched in July 2013 to bore the Anacostia tunnel with is one of three being undertaken as part of the Clean Waters scheme to improve water quality in the Anacostia and Potomac rivers.
“This is a terrific milestone for DC Water’s Clean Rivers Project,” said DC Water CEO and general manager George Hawkins. “We are fortunate that the tunnelling went so smoothly, finishing on time and on budget, and I applaud our DC Water staff as well as [contractor] Traylor Skanska Jay Dee and everyone else who took part in this successful dig.”
Construction on the other two tunnels is still underway.