logo logo

Milwaukee Deep Tunnel Project

Deep tunnel.Deep in the bedrock 130 feet below milwaukee lie 19.4 miles of tunnel large enough to drive a truck through5 the deep tunnel sewer project.The milwaukee metropolitan sewerage district mmsd began the deep tunnel project in 1977 in an effort to reduce the sewer system overflows that occurred after most major rainfalls.The first phase of deep tunnel opened in 1993, phase two.