December 2023 Minneapolis Central City Tunnel Project Update

Via a December 22 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 almost 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

In November, crews continued to work on the concrete tunnel lining, pouring about 1,450 cubic yards of concrete. To date 12,750 cubic yards of concrete have been poured. As noted in the infographic above, this is just under four times the volume of an Olympic swimming pool. This process is approximately 90% 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.
  • 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.

• Northbound lane of Portland Ave will be periodically closed between Washington Ave and 2nd Closures will happen during the workday only.
  • Closure is for the placement of concrete into the tunnel.
  • East crosswalk across Washington and north crosswalk across Portland will be closed.
  • Sidewalks will remain open to businesses and residences.

• The north sidewalk along Washington Ave remains restricted between Hennepin Ave and Nicollet Mall.
  • 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 is closed for the winter.

• 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.

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.
• The next project update will be in February 2024.

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