Minneapolis Central City Tunnel System

May 6, 2024

Minneapolis Central City Tunnel: Project overview

The City of Minneapolis Public Works Department is constructing a new parallel storm tunnel, enlarging a portion of the existing storm tunnel, and constructing a new tunnel access in Downtown Minneapolis.

The new tunnel is being constructed parallel to the existing tunnel located under Washington Ave S between Nicollet Mall and Chicago Ave. The existing tunnel under Chicago Ave between Washington Ave S and the Mississippi River is being expanded to handle the increased stormwater capacity. The purpose of this project is to reduce pressure in the existing tunnel, provide more room for future growth, and to reduce the need for future repairs and tunnel failures.

Project map

Latest project news

Mississippi River Portal

• Crews continue reconstruction of the storm tunnel outlet at the Mississippi Rive

2nd Ave

• Crews continue construction of a concrete liner for the new parallel storm tunnel under Washington Ave from the new tunnel access shaft in the southbound lanes of 2nd Ave S, just north of the Washington Ave intersection.

Portland Ave

• Crews continue construction of a concrete liner for the new parallel storm tunnel under Washington Ave from the existing tunnel access shaft at the northeast corner of the Washington Ave and Portland Ave intersection.

Barring any unforeseen issues, major work will be completed at the 2nd Avenue and Portland Avenue access shafts by mid-june. Traffic will be restored to its preconstruction condition.

Schedule is tentative and subject to change due to weather and other unforeseen circumstances.

Lining progress

Crews continue to work on the concrete tunnel lining, pouring about 300 cubic yards of concrete in the last month. To date 14,600 cubic yards of concrete have been poured. As noted in the infographic above, this is approximately 1700 truckloads of concrete. This process is about 98% complete.

Stay connected

Visit the project website for more information and to sign up for project updates: https://www.minneapolismn.gov/government/projects/central-city-tunnel/

Email the project team: info@mplscentralcitytunnel.com

Contact the project hotline: 612-888-9418

For reasonable accommodations or alternative formats please contact 311.

People who are deaf or hard of hearing can use a relay service to call 311 at 612-673-3000. TTY users can call 612-673-2157 or 612-673-2626.

Para asistencia, llame al 311. Rau kev pab 311. Hadii aad Caawimaad u baahantahay 311