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Stewart Tunnel

Badger State Trail

Stewart Tunnel Update:
Sections of loose and falling rocks from the ceiling and side walls inside the Stewart Tunnel on the Badger State Trail caused the DNR to close the tunnel in 2019 for safety concerns. In the Governor’s 2023-2025 Biennial Budget, $6.6 million was included for repairing the Stewart Tunnel beginning in April 2026. The project is proceeding with repairs consistent with the scope of work described as Alternative 4 – Corrugated Metal Pipe Lining in the Stewart Tunnel Alternative Analysis Report (see below). 

After months of work inside the Stewart Tunnel, crews have installed the corrugated metal liner, drainage systems, footings, bulkheads and pumped concrete around and over the culvert. Contractors still have work to perform before the trail is permanently opened to use. The DNR anticipates a temporary opening in late 2026; however the trail will be closed in spring 2027 to finish repairs and fully complete the project. Until the Stewart Tunnel and this section of trail is open, trail users should continue to use the Tunnel Road detour and stay outside all posted construction areas. (Updated 10/7/26).
Stewart Tunnel Closed
The Stewart Tunnel has been closed since 2019.

Stewart Tunnel Alternatives Analysis

In December 2021, engineering firm GEI Consultants provided a Badger State Trail Stewart Tunnel Review of Alternatives Report for the Stewart Tunnel that analyzed nine different alternatives from an engineering standpoint. The DNR used the GEI report as a starting point for developing the Stewart Tunnel Alternatives Analysis report that analyzed a variety of considerations to formulate a recommendation.

A public comment period was conducted from April through June 17, 2022, on the draft Alternatives Analysis report. Stakeholders and the public were encouraged to submit comments using an online feedback form or in writing to the department. A total of 901 public comments were received.

Recommendation

The Alternatives Analysis report recommends Alternative 4 – Corrugated Metal Pipe Lining – because it would provide a long-term solution for ensuring safer, year-round access to the tunnel for recreational purposes while also preserving the bat hibernaculum. Additional information regarding the recommendation can be found in the Stewart Tunnel Alternatives Analysis.

Project contacts

Terry Bay
Bureau Director, Facilities and Lands
Phone: 608-266-5782
Email: Terryh.Bay@wisconsin.gov

Sara Rigelman
Recreation Liaison
Phone: 608-572-5007
Email: Sara.Rigelman@wisconsin.gov

Missy Vanlanduyt
Recreation Partnerships, External Relations and Communication Section Chief
Phone: 608-515-6006
Email: Melissa.Vanlanduyt@wisconsin.gov