Work is underway on Interstate 94 in Milwaukee County, part of a broader push to update the main corridor that connects Milwaukee with Madison and carries tens of thousands of commuters each day.
Built in the 1960s, the 3.5-mile stretch between 70th and 16th streets in Milwaukee County has reached the end of its useful life, the Wisconsin Department of Transportation says. Crash rates have run two to three times higher than the statewide average, driven in part by outdated design features like left-hand exits. The reconstruction aims to fix that, replacing 43 aging bridges, widening the freeway from six to eight lanes, and modernizing interchanges that serve some of the region’s industrial and entertainment centers.
Construction, which began in late 2025 and is expected to continue through 2033, has introduced lane reductions, ramp closures and detours. Major destinations near the corridor are adjusting. The Milwaukee Brewers, whose home field sits just off the freeway, have rolled out new traffic tools and staffing plans to manage game-day congestion near American Family Field. Working with the DOT, the team is directing fans to alternate routes, adding traffic control support after games and funding tow services to quickly clear disabled vehicles. Nearby, Potawatomi Casino Hotel has also been routing guests around closures.
The project has not moved forward without opposition. Some local groups and environmental advocates have challenged the expansion in court, raising concerns about air quality, neighborhood impacts and whether additional freeway capacity will ultimately reduce congestion. Lawsuits filed over the past several years sought to halt or scale back the project, though construction ultimately proceeded after state and federal approvals.
While Milwaukee County rebuilds its section of I-94, attention is also turning westward to a 12.5-mile stretch of I-94 in Waukesha County from Pewaukee’s Prospect Avenue to the Jefferson County line.
The freeway narrows from three lanes to two in each direction along that stretch, creating a bottleneck for the 50,000 to 75,000 vehicles that use it daily. Safety has become a central concern, too, with 1,400 crashes occurring in the corridor between 2019 and 2023, with fatalily and injury rates well above the state average. Tight curves, short on-ramps and limited sight distance are cited as contributing factors.
Stages of I-94 East-West Construction
Source: WisDOT
The DOT has ranked this segment as its top priority for future study, and the Transportation Projects Commission has unanimously approved further evaluation of expansion options.
Business leaders say the issue is simple: the region is growing faster than the freeway can handle.
Amanda Payne, president and CEO of the Waukesha County Business Alliance, described the corridor as both unsafe and constraining growth. The group has rallied more than 20 organizations, including manufacturers, labor unions and other community stakeholders, around expanding the freeway.
“This is a critical corridor for freight for southeastern Wisconsin, but also for the entire state. It’s increasingly a busy commuter corridor, too,” Payne said. “We’re looking at travel times, safety and economic growth, and how those all factor into the need to expand.”
Any expansion of I-94 in western Waukesha County remains years away, however. Environmental studies and planning timelines suggest construction may not begin until well into the next decade, with some projections putting completion of the study phase around 2030 or later.
Oconomowoc sits along this corridor and has become one of the region’s fastest-growing suburbs. Once primarily a bedroom community, it has evolved into both an employment hub and a regional center for commerce and health care, according to economic development director Bob Duffy.
Since 2000, the city’s population has grown by about 15%, alongside a wave of industrial and retail development and new housing construction still in the development pipeline.
“Being the midpoint between Milwaukee and Madison, we have people commuting out heading in both directions, but we also have just as many people commuting in for work, shopping or medical care,” Duffy said.
Growth is also pushing farther west into Jefferson County, where lower land costs and available space have attracted new residential and commercial development, including a boom of industrial development in the city of Jefferson. That expansion is adding more pressure to the I-94 corridor, particularly as workers travel longer distances between job centers and housing.
“I think that entire corridor between Madison and then Milwaukee is just going to continue to flourish,” Payne said. “And so, when we think about development opportunities in the next 10 or 20 years, we think addressing our freeway needs is an important step in that process.”
At the same time, state and local leaders are also considering alternatives to relying solely on highways.
The proposed Hiawatha West expansion would extend Amtrak’s existing Chicago to Milwaukee passenger rail service onward to Madison, with intermediate stops planned in Pewaukee and Watertown. First revived under the federal Bipartisan Infrastructure Law in 2021, the project is now in the planning phase, with a potential launch window in the early 2030s.
Initial plans call for two to four daily round trips, with travel time between Milwaukee and Madison estimated at about 90 minutes. Early projections suggest the service could attract roughly 250,000 passengers to and from Madison annually.
