# Interstate 41

Interstate 41 (I-41) is a 175.00-mile-long (281.64 km) north–south Interstate Highway connecting the interchange of I-94 and U.S. Route 41 (US 41), located about a mile (1.6 km) south of the Wisconsin–Illinois border at the end of the Tri-State Tollway in metropolitan Chicago, to an interchange with I-43 in metropolitan Green Bay, Wisconsin. The designation travels concurrently with US 41 for its entire length, as well as portions of I-894, US 45, I-43, and sections of I-94 in Wisconsin and Illinois. The route was officially added to the Interstate Highway System on April 7, 2015, and connects Milwaukee and Green Bay with the Fox Cities.

## Route description

I-41 begins at the I-94/US 41 interchange in Russell, Illinois, located about a mile (1.6 km) south of the Wisconsin–Illinois border at the end of the Tri-State Tollway. The highway continues north concurrently with I-94 as part of the North-South Freeway to the Mitchell Interchange in Milwaukee, turns west to run concurrently with I-894 and I-43 as the Airport Freeway to the Hale Interchange (forming a brief wrong-way concurrency with I-43), and turns north to run concurrently as the Zoo Freeway with I-894 and US 45 to the Zoo Interchange, with the US 45 concurrency continuing until the I-41/US 41/US 45 split near Richfield. The Interstate roughly parallels I-43, which runs north–south along Lake Michigan from Milwaukee to Green Bay. I-41 runs through the Fox Valley (including the cities of Fond du Lac, Oshkosh, and Appleton, along with the Fox Cities). At Appleton, I-41 intersects US 10 and State Trunk Highway 441 (WIS 441), the latter of which is a freeway that forms a beltway around Appleton by running around the south and east side of the city and back to I-41. Further north, I-41 intersects WIS 172 on the south side of Green Bay, before running along the city's west side to its end at the I-43 interchange. The Interstate is 175.00 miles (281.64 km) long and located almost entirely within the state of Wisconsin and is completely concurrent with a slightly adjusted alignment of US 41 to its termination in Green Bay.
* I-41 in Wauwatosa
* Newly installed I-41/US 41 sign south of WIS 145 near Richfield from June 2015

## History

The freeway portion of US 41 and US 45 from Milwaukee through the Fox Valley to Green Bay was proposed and designated as an Interstate Highway as part of the 2005 highway funding bill (Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users).
In the initial language of the bill, the route was designated Interstate 41, which correlates with the U.S. Highway it parallels and also complies with the Interstate naming guidelines through the American Association of State Highway and Transportation Officials (AASHTO). The final bill omitted the I-41 designation. In 2009, Green Bay officials began a campaign to have US 41 designated as a northern extension of I-55 from its current termination in Chicago, with the alternative being designated as a spur of I-43. At the spring meeting of the Special Committee on U.S. Route Numbers of AASHTO on May 18, 2012, the I-55 designation was discussed by the committee. Coordination would have been required with the Federal Highway Administration (FHWA) and the Illinois Department of Transportation (IDOT) on the I-55 designation.
However, IDOT officials were not interested in signing an extension of I-55 from its Chicago terminus to the state line. Therefore, the Wisconsin Department of Transportation (WisDOT) decided to seek a different designation not requiring the cooperation of their Illinois counterparts. Four designations were proposed by WisDOT and put up for public review: two new primary designations (I-41 and I-47) and two auxiliary designations (I-594 and I-643). At the end of October 2012, WisDOT submitted I-41 to AASHTO for consideration at their fall Special Committee meeting, where it was conditionally approved on November 16, 2012, pending FHWA concurrence. Official approval of I-41 then hinged on weight limit exceptions being approved for the route, which initially passed the United States House of Representatives as H.R. 4745 and awaited a United States Senate vote as S. 2438, but there were later passed in a different bill (H.R. 83) on December 16, 2014. On April 9, 2015, Wisconsin Governor Scott Walker announced that the FHWA had approved I-41 as part of the Interstate Highway System. According to WisDOT, the approval came two days earlier.
WisDOT replaced or modified 3,500 signs before and near September 2015 after coordination with IDOT and the FHWA (signs erected in 2014 and into 2015 before approval of the designation had the I-41 shield obscured until approval). Over the next 5–10 years, shoulders are slated to be rebuilt as older parts of the highway are rebuilt. The redesignation to Interstate status also makes the route subject to the Highway Beautification Act, meaning current advertising billboards along the Milwaukee-to-Green Bay portion of the road can no longer be upgraded or enlarged nor can new signs be added.

## Future

Beginning in early 2024, WisDOT plans to start several projects to improve I-41 in the Appleton//Fox Cities metro area between Neenah and De Pere. The projects will include widening the Interstate from two to three lanes in each direction on a 23-mile-long (37 km) stretch between Appleton and De Pere, upgrading interchanges, reconstructing bridges, and repaving sections of the freeway, along with the new South Bridge Connector project adding a new Fox River span south of De Pere with an I-41 interchange. These projects are expected to be completed by 2030.

## Exit list

| County | Location | mi | km | Exit | Destinations | Notes |
| Lake | Newport Township | 0.00 | 0.00 | 1B | I-94 Toll east (Tri-State Tollway) – Chicago, Indiana US 41 south (Skokie Highway) – Waukegan | Southern end of I-94/US 41 concurrency; southbound entrance only from Frontage Road, acts as the entrance ramp from Russell Road to I-94 east |
| Lake | Newport Township | 0.76 | 1.22 | 1A | CR A1 (Russell Road) | Signed as exit 1 northbound; exit numbers based on I-94's mile markers |
| | | 0.900.00 | 1.450.00 | Illinois–Wisconsin state line | Illinois–Wisconsin state line | Illinois–Wisconsin state line |
| Kenosha | Pleasant Prairie | 2.04 | 3.28 | 347 | WIS 165 / CTH-Q (Lakeview Parkway) | |
| Kenosha | Pleasant Prairie | 3.43 | 5.52 | 345 | CTH-C (Wilmot Road) | |
| Kenosha | Kenosha | 5.07 | 8.16 | 344 | WIS 50 (75th Street) – Kenosha, Lake Geneva | To 71st Street |
| Kenosha | Somers | 6.59 | 10.61 | 342 | WIS 158 (52nd Street) – Kenosha | Kenosha Regional Airport |
| Kenosha | Somers | 8.35 | 13.44 | 340 | WIS 142 (Burlington Road) / CTH-S – Burlington, Kenosha | |
| Kenosha | Town of Paris | 10.07 | 16.21 | 339 | CTH-E (Somers Road) – Somers | |
| Racine–Kenosha county line | Mount Pleasant–Paris village/town line | 12.08 | 19.44 | 337 | WIS 195 – Mount Pleasant, Somers | |
| Racine | Mount Pleasant | 13.95 | 22.45 | 335 | WIS 11 (Durand Avenue) – Burlington, Racine | |
| Racine | Town of Yorkville | 15.96– 16.01 | 25.69– 25.77 | 333 | WIS 20 (Washington Avenue) – Waterford, Racine | |
| Racine | Caledonia | 19.64 | 31.61 | 329 | CTH-K (Northwestern Avenue) – Racine, Caledonia | |
| Racine | Town of Raymond | 21.67 | 34.87 | 327 | CTH-G (5+1⁄2 Mile Road) – Caledonia | |
| Racine | Town of Raymond | 23.17 | 37.29 | 326 | Seven Mile Road | Current southern terminus of WIS 241 |
| Racine | Caledonia | 24.10 | 38.79 | 325 | WIS 241 north (27th Street) | Exit permanently closed; northbound exit and southbound entrance |
| Milwaukee | Oak Creek | | | 324 | Elm Road to WIS 241 | |
| Milwaukee | Oak Creek | 26.39 | 42.47 | 322 | WIS 100 (Ryan Road) | |
| Milwaukee | Oak Creek | 28.47 | 45.82 | 321 | Drexel Avenue | |
| Milwaukee | Oak Creek | 29.41 | 47.33 | 320 | CTH-BB (Rawson Avenue) | |
| Milwaukee | Milwaukee | 30.38 | 48.89 | 319 | CTH-ZZ (College Avenue) | |
| Milwaukee | Milwaukee | 31.08 | 50.02 | 318 | WIS 119 – Milwaukee Mitchell International Airport | |
| Milwaukee | Milwaukee | 32.37 | 52.09 | 316 | CTH-Y (Layton Avenue) to 27th Street | |
| Milwaukee | Milwaukee | 32.53– 32.69 | 52.35– 52.61 | 10 317 | I-94 east (North–South Freeway) – Chicago, Airport I-43 north (North–South Freeway) / I-94 west – Milwaukee I-894 west (Airport Freeway) | Northern end of I-94 concurrency; eastern end of I-43 wrong-way concurrency; eastern end of I-894 concurrency; Mitchell Interchange |
| Milwaukee | Milwaukee | 33.60 | 54.07 | 9 | WIS 241 – South 27th Street | No access is allowed from I-94 west or to I-94 east; exit numbers based on I-894's mile markers |
| Milwaukee | Greenfield | 34.64 | 55.75 | 8 | WIS 36 – Loomis Road | |
| Milwaukee | Greenfield | 35.64 | 57.36 | 7 | South 60th Street | |
| Milwaukee | Greenfield | 36.66 | 59.00 | 5B | South 76th Street | Northbound exit and southbound entrance |
| Milwaukee | Greenfield | 36.66– 37.14 | 59.00– 59.77 | 5A | South 76th Street, South 84th Street | Southbound exit and northbound entrance |
| Milwaukee | Greenfield | 36.86 | 59.32 | 5A | WIS 24 west – Forest Home Avenue | Northbound exit and southbound entrance |
| Milwaukee | Milwaukee | 38.06 | 61.25 | 4 | I-43 south (Rock Freeway) / US 45 south – Beloit, Chicago | Western end of I-43 concurrency; southern end of the US 45 concurrency; Hale Interchange |
| Milwaukee | Greenfield | 39.32 | 63.28 | 3 | CTH-T (Beloit Road) | |
| Milwaukee | Greenfield | 39.93 | 64.26 | 2B | Oklahoma Avenue | Southbound exit and northbound entrance |
| Milwaukee | West Allis | 40.67 | 65.45 | 2A | National Avenue | Southbound exit to westbound National Avenue only |
| Milwaukee | West Allis | 40.93 | 65.87 | 1E | Lincoln Avenue | Southbound exit and northbound entrance |
| Milwaukee | West Allis | 41.89 | 67.42 | 1D | WIS 59 – Greenfield Avenue | |
| Milwaukee | Milwaukee | 42.61 | 68.57 | 1 38 | I-94 (East–West Freeway) – Madison, Downtown Milwaukee, Chicago I-894 east (Zoo Freeway) | Western end of I-894 concurrency; signed as exits 1A (east) and 1B (west) northbound and exits 38A (west) and 38B (east) southbound; Zoo Interchange |
| Milwaukee | Wauwatosa | 43.36– 43.60 | 69.78– 70.17 | 39 | US 18 (Bluemound Road) / Wisconsin Avenue | Northbound exit is not signed for Wisconsin Avenue; exit numbers based on US 45's mile markers |
| Milwaukee | Wauwatosa | 44.14– 44.56 | 71.04– 71.71 | 40 | Watertown Plank Road, Swan Boulevard | Southbound exit not signed for Swan Boulevard |
| Milwaukee | Wauwatosa | 44.94 | 72.32 | 42A | WIS 100 north (Mayfair Road) / North Avenue east | Southbound exit not signed for WIS 100 |
| Milwaukee | Wauwatosa | 45.54 | 73.29 | 42B | North Avenue west | |
| Milwaukee | Wauwatosa | 46.59 | 74.98 | 43 | Burleigh Street | |
| Milwaukee | Wauwatosa | 47.59 | 76.59 | 44 | WIS 190 (Capitol Drive) | Three-level diamond interchange; access roads for the adjacent Harley-Davidson and Penzeys Spices plants are also part of the interchange |
| Milwaukee | Milwaukee | 48.69 | 78.36 | 45 | CTH-EE (Hampton Avenue) | |
| Milwaukee | Milwaukee | 49.52 | 79.69 | 46 | CTH-E south (Silver Spring Drive) / WIS 100 | Southern end of WIS 100 concurrency |
| Milwaukee | Milwaukee | 51.05 | 82.16 | 47 | WIS 175 (Appleton Avenue) | |
| Milwaukee | Milwaukee | 51.85 | 83.44 | 47B | CTH-PP (Good Hope Road) | Exit numbers based on US 41's mile markers |
| Milwaukee | Milwaukee | 52.15– 52.94 | 83.93– 85.20 | 48 | WIS 145 (Fond du Lac Freeway/124th Street) | |
| Waukesha | Menomonee Falls | 54.64– 54.77 | 87.93– 88.14 | 50 | WIS 74 west / WIS 100 east (Main Street) | Northern end of WIS 100 concurrency; signed as exits 50A (east) and 50B (west); WIS 74 designation removed on November 1, 2015 |
| Waukesha | Menomonee Falls | 55.45 | 89.24 | 51 | Pilgrim Road | Signed as exits 51A (north) and 51B (south) |
| Washington | Germantown | 56.68 | 91.22 | 52 | CTH-Q (County Line Road) / Alt. I-41 / Alt. US 45 | I-41 Alternate/US 45 Alternate only signed northbound |
| Washington | Germantown | 58.63 | 94.36 | 54 | WIS 167 east (Mequon Road) / CTH-Y (Lannon Road) | Southern end of WIS 167 concurrency |
| Washington | Germantown | 61.64 | 99.20 | 57 | WIS 167 west (Holy Hill Road) / Alt. I-41 / Alt. US 45 | Northern end of WIS 167 concurrency; I-41 Alternate/US 45 Alternate only signed southbound |
| Washington | Richfield | 63.27 | 101.82 | 59 | US 45 north – West Bend | Northern end of US 45 concurrency; northbound exit and southbound entrance |
| Washington | Richfield | 64.37 | 103.59 | 60 | CTH-FD (Fond du Lac Avenue/Pioneer Road) to WIS 145 | Signage reads WIS 145; ramp signage reads CTH-FD TO WIS 145 |
| Washington | Slinger | 68.17 | 109.71 | 64 | WIS 60 (Commerce Blvd.) – Jackson, Slinger, Hartford, Grafton | Signed as exits 64A (east, Jackson) and 64B (west, Slinger, Hartford) northbound |
| Washington | Town of Polk | 70.45 | 113.38 | 66 | WIS 144 (Kettle Moraine Drive) – West Bend, Slinger | Little Switzerland Ski Area, Slinger Speedway |
| Washington | Town of Hartford | 72.12 | 116.07 | 68 | CTH-K | |
| Washington | Town of Addison | 76.37 | 122.91 | 72 | WIS 33 / CTH-W – West Bend, Allenton, Horicon | |
| Washington | Town of Wayne | 79.59 | 128.09 | 76 | CTH-D | |
| Dodge | Town of Theresa | 85.22 | 137.15 | 81 | WIS 28 – Mayville, Kewaskum, Theresa | Horicon Marsh State Wildlife Area Southern Section |
| Dodge | Lomira | 89.24 | 143.62 | 85 | WIS 67 – Lomira, Campbellsport | Kettle Moraine State Forest Northern Unit |
| Dodge | Town of Lomira | 91.29 | 146.92 | 87 | WIS 49 / CTH-KK – Brownsville, Waupun | Horicon Marsh State Wildlife Area Northern Section |
| Fond du Lac | Town of Byron | 96.10 | 154.66 | 92 | CTH-B – Oakfield, Eden | |
| Fond du Lac | Fond du Lac | 99.71– 99.72 | 160.47– 160.48 | 95 | US 45 south / US 151 – Madison, Manitowoc, Waupun, Beaver Dam | Southern end of US 45 concurrency |
| Fond du Lac | Fond du Lac | 101.01 | 162.56 | 97 | CTH-VVV (Hickory Street) | |
| Fond du Lac | Fond du Lac | 101.84 | 163.90 | 98 | CTH-D (Military Road) | Former US 151; Fond du Lac County Airport |
| Fond du Lac | Fond du Lac | 103.74 | 166.95 | 99 | US 45 north / WIS 23 (Johnson Street) – Rosendale, Ripon | Northern end of US 45 concurrency |
| Fond du Lac | North Fond du Lac | 104.24 | 167.76 | 101 | CTH-OO (Winnebago Street) | |
| Fond du Lac | Town of Eldorado | 110.27 | 177.46 | 106 | CTH-N – Van Dyne | |
| Winnebago | Oshkosh | 117.47 | 189.05 | 113 | WIS 26 / CTH-N – Rosendale, Waupun, Pickett | |
| Winnebago | Oshkosh | 120.22 | 193.48 | 116 | WIS 44 / WIS 91 (South Park Avenue/Ripon Road) – Ripon, Waukau, Berlin | Wittman Regional Airport |
| Winnebago | Oshkosh | 121.64 | 195.76 | 117 | 9th Avenue | |
| Winnebago | Oshkosh | 123.14 | 198.17 | 119 | WIS 21 (Omro Road, Oshkosh Avenue) – Omro, Redgranite, Wautoma | |
| Winnebago | Oshkosh | 125.05 | 201.25 | 120 | US 45 (Algoma Boulevard) to US 10 west – New London | To US 10 west not signed southbound |
| Winnebago | Oshkosh | 128.10 | 206.16 | 124 | WIS 76 (Jackson Street) – Shiocton | |
| Winnebago | Neenah | 133.30 | 214.53 | 129 | Bell Street, Breezewood Lane | |
| Winnebago | Neenah | 134.67 | 216.73 | 131 | WIS 114 / CTH-JJ (Winneconne Avenue) – Hilbert, Sherwood | |
| Winnebago | Neenah | 135.61 | 218.24 | 132 | Main Street, Oak Ridge Road | No entrance ramps |
| Winnebago | Fox Crossing | 136.35 | 219.43 | 133 | CTH-II (Winchester Road) – Winchester | |
| Winnebago | Fox Crossing | 137.81 | 221.78 | 134 | US 10 east / WIS 441 north (Tri-County Expressway) – Menasha, Manitowoc | Michael G. Ellis Memorial Interchange |
| Winnebago | Fox Crossing | 137.86 | 221.86 | 134 | US 10 west – Stevens Point, Waupaca | Michael G. Ellis Memorial Interchange |
| Winnebago | Fox Crossing | 139.62 | 224.70 | 136 | CTH-BB (Prospect Avenue) – Appleton | |
| Outagamie | Town of Grand Chute | 140.88 | 226.72 | 137 | WIS 125 (College Avenue) / CTH-CA – Appleton International Airport, Downtown Appleton | |
| Outagamie | Town of Grand Chute | 141.65 | 227.96 | 138 | WIS 96 (Wisconsin Avenue) – Fremont, Appleton | |
| Outagamie | Town of Grand Chute | 142.71 | 229.67 | 139 | WIS 15 / CTH-OO (Northland Avenue) to CTH-A – Greenville, Hortonville, Appleton | To CTH-A not signed southbound; Neuroscience Group Field at Fox Cities Stadium |
| Outagamie | Town of Grand Chute | 145.67 | 234.43 | 142 | WIS 47 (Richmond Street) – Black Creek, Appleton | |
| Outagamie | Appleton | 147.67 | 237.65 | 144 | CTH-E (Ballard Road) | |
| Outagamie | Appleton | 148.59– 148.61 | 239.13– 239.16 | 145 | WIS 441 south (Tri-County Expressway) – Kimberly | |
| Outagamie | Little Chute | 151.10 | 243.17 | 146 | CTH-N (Freedom Road) – Little Chute, Kimberly, Combined Locks | |
| Outagamie | Kaukauna | 152.78 | 245.88 | 148 | WIS 55 (Delanglade Avenue) – Seymour, Kaukauna, Sherwood, Freedom | |
| Outagamie | Kaukauna | 153.99 | 247.82 | 150 | CTH-J (Lawe Street/Hyland Avenue) – Kaukauna | |
| Outagamie | Town of Kaukauna | 158.25 | 254.68 | 154 | CTH-U (County Line Road) – Wrightstown, Hobart | |
| Brown | Town of Lawrence | 161.21 | 259.44 | 157 | CTH-S (Lawrence Drive) – Freedom, De Pere | |
| Brown | Town of Lawrence | 181.87 | 292.69 | 161 | CTH-F (Scheuring Road) – De Pere | |
| Brown | Ashwaubenon | 167.12 | 268.95 | 163A | CTH-G (Main Avenue) – De Pere | |
| Brown | Ashwaubenon | 167.40 | 269.40 | 163B | WIS 32 north (Ashland Avenue) – Green Bay | Northbound exit and southbound entrance |
| Brown | Ashwaubenon | 168.39 | 271.00 | 164A | CTH-AAA (Oneida Street, Waube Lane) | |
| Brown | Ashwaubenon | 169.36– 169.46 | 272.56– 272.72 | 164B | WIS 172 to I-43 / WIS 57 – A. Straubel Airport | To WIS 57 not signed northbound |
| Brown | Ashwaubenon | 171.14 | 275.42 | 167 | CTH-VK (Lombardi Avenue, Hazelwood Lane) – Green Bay | Lambeau Field |
| Brown | Green Bay | 172.18 | 277.10 | 168A | WIS 32 south / WIS 54 (Mason Street) – Seymour, Ashwaubenon | Southern end of WIS 32 concurrency |
| Brown | Howard | 173.17 | 278.69 | 168B-C | WIS 29 / WIS 32 north (Shawano Avenue) – Wausau, Shawano, Green Bay | Northern end of WIS 32 concurrency |
| Brown | Howard | 174.75 | 281.23 | 170A | US 141 south (Velp Avenue) – Green Bay | Southern end of US 141 concurrency |
| Brown | Howard | 175.16– 175.43 | 281.89– 282.33 | 170B | I-43 south / LMCT – Milwaukee, Green Bay US 41 north / US 141 north / LMCT – Marinette, Iron Mountain | Northern end of US 41 concurrency; northern end of US 141 concurrency; northern terminus of I-43; I-41 terminates at northbound entrance ramp from I-43 |
| 1.000 mi = 1.609 km; 1.000 km = 0.621 mi Incomplete access |||||||