Explore the Selected Project Improvements
Before the I-41 Project was approved for construction, WisDOT developed and studied multiple alternatives to reduce congestion, and update the roadway and bridges to meet current design standards.
WisDOT factored feedback from the public, tribes, businesses, agencies and local governments during the evaluation, which assessed each alternative’s ability to address the project’s purpose and need, and its potential environmental impacts, required right of way and estimated cost.
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WIS 15/County OO (Northland Avenue) Interchange
Diverging Diamond Interchange
This interchange was reconstructed as a diverging diamond interchange in 2025 to better accommodate higher volumes of traffic more safely. The merge distance for the I-41 northbound entrance ramp was also increased.
WIS 441 System Interchange
55 mph Flyover Ramp
The 55 mph flyover ramp alternative requires less land, has fewer impacts and costs less than a 60 mph flyover alternative while offering similar operational and safety benefits.
County S (Freedom Road) Interchange
Diamond Interchange with Roundabouts
This interchange will be reconstructed to diamond interchange with roundabouts at the County S/Mid Valley Drive and County S/French Road intersections.
Southbridge Interchange *NEW
Diamond Interchange with Roundabouts
WisDOT is constructing a new diamond interchange with multi-lane roundabouts.
A shared use path will also be added on the north side of Southbridge Road.
Please visit the link
below to learn more: Brown County South Bridge Project
Auxiliary Lanes
An auxiliary lane is an extra lane added between interchange on- and off-ramps. It is used to ease speed changes, balance the traffic load, and provide an efficient way to weave into and out of traffic while lessening congestion in the through lanes.
Locations (5):
From WIS 96 to WIS 15
From WIS 47 to County E
WIS 441 from I-41 to County OO
From WIS 55 to County J
From Southbridge Road Interchange to County F
Auxiliary lanes will be built between these closely spaced interchanges in addition to a third travel lane that will be built as part of the I-41 Mainline improvements.
Collector-Distributor Road
Location (1):
From County E to WIS 441
A collector-distributor or C-D road will improve safety, requires less land and is less expensive than the alternatively considered braided ramp option, while providing a safe connection with acceptable traffic operations.
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