February 2024 Minneapolis Central City Tunnel Project Update

Via a February 23 e-announcement from the City of Minneapolis:

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 River; excavation activities are complete.

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.

Lining progress

Since December, crews have continued to work on the concrete tunnel lining, pouring about 750 cubic yards of concrete. To date 13500 cubic yards of concrete have been poured. As noted in the infographic above, this is just over four times the volume of an Olympic swimming pool. This process is approximately 93% complete.

What to expect

• Expect additional noise, dust, and vibration as crews complete work.
• Schedule is tentative and subject to change due to weather and other unforeseen circumstances.
• Working hours will vary in the coming weeks due to the holiday and scheduled training.

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