March 2023 Minneapolis Central City Tunnel Project Update

Via a March 17 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 enlarging the existing storm tunnel at the Mississippi River and continue to work on lining the tunnel with concrete.

2nd Ave

• Crews continue tunneling 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 and continue to work on lining the tunnel with concrete.

Portland Ave

• Crews continue tunneling 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 and continue to work on lining the tunnel with concrete.

Tunneling Progress

In March, the project reached 88% completion with excavation. Crews have removed approximately 60,000 tons of material to date. As noted in the infographic above, 60,000 tons is equal to the weight of almost six Eiffel Towers.

Lining progress

In March, crews continued to work on the concrete tunnel lining. To date,1,800 cubic yards of concrete have been poured. As noted in the infographic above, 1,800 cubic yards is about half the volume of an Olympic swimming pool. This process is approximately 12% complete.

Long-term closures/restrictions

• The north westbound lane, bike lane, and parking lane remains closed on Washington Ave between Portland Ave and Park Ave. These closures will remain in place until the project is completed. This is necessary for the contractor to utilize the existing shaft to connect the existing tunnel to the new tunnel.
  • During this closure, pedestrians can still use the sidewalks along Washington Ave.
  • Crosswalks across Washington Ave and Portland Ave will remain open.
  • Bicyclists will share the traffic lane.
  • The existing left turn lane on Washington Ave at the Portland Ave intersection will temporarily become a left turn and through lane.

• The north sidewalk along Washington Ave remains restricted between Hennepin Ave and Nicollet Mall. The contractor will resume tunneling from the existing tunnel to the new tunnel at a later date.
  • During these restrictions, pedestrians share the bike lane on Washington Ave.
  • The crosswalks at the Washington Ave intersections of Nicollet Mall and Hennepin Ave remains open.

• The sidewalk on the east side of 4th Ave S remains restricted through the end of the project. The dewatering well and pumps are installed in this area.
  • Pedestrians can use the sidewalk on the west side of 4th Ave S.
  • The crosswalk at the Washington Ave and 4th Ave intersection remains open.
  • Access to driveways off 4th Ave S remains open.

• The west sidewalk of Portland Ave south of Washington Ave will remain restricted to pedestrians around the dewatering well and pumps until the project is completed.

• The parking lot and trail near Mill Runs Park will remain closed until spring 2023.

• 2nd Ave S remains a single lane in each direction using the northbound lanes between Washington Ave and 1st St S. Access will be restricted until the project is completed.
  • Access to driveways off 2nd Ave S remain open. There may be short-term access delays while crews move equipment and materials around.

Stay Connected

There are multiple ways to get information including email updates and ongoing stakeholder meetings. 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