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Interstate 39

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(Redirected from I-39 (WI)) Interstate Highway in Illinois and Wisconsin "I-39" redirects here. For the Imperial Japanese Navy submarine, see Japanese submarine I-39. For the state highway in Wisconsin, see Wisconsin Highway 39.

Interstate 39 markerInterstate 39
I-39 highlighted in red
Route information
Maintained by IDOT, ISTHA and WisDOT
Length306.14 mi (492.68 km)
Existed1986–present
NHSEntire route
Major junctions
South end I-55 / US 51 in Normal, IL
Major intersections
North end US 51 / WIS 29 near Rothschild, WI
Location
CountryUnited States
StatesIllinois, Wisconsin
CountiesIL: McLean, Woodford, Marshall, LaSalle, Lee, Ogle, Winnebago
WI: Rock, Dane, Columbia, Marquette, Waushara, Portage, Marathon
Highway system
← IL 38IL→ US 40
← WIS 38WI→ WIS 39

Interstate 39 (I-39) is a north–south Interstate Highway in Illinois and Wisconsin that runs from an interchange at I-55 in Normal, Illinois, to State Trunk Highway 29 (WIS 29) approximately six miles (9.7 km) south of Wausau, Wisconsin. In total, Interstate 39 is 306.14 miles (492.68 km) long. In Illinois, the route has a total length of 140.82 miles (226.63 km); in Wisconsin, I-39 has a distance of 182 miles (293 km).

Among the newest Interstate Highways in Illinois, I-39 was completed in 1992. Designed to replace U.S. Route 51 (US 51) with an Interstate-grade freeway, the highway runs concurrently with US 20 in Rockford before joining I-90. From Rockford to Portage, Wisconsin, I-39 and I-90 run concurrently. From Madison to Portage, I-94 joins the two; at 29 miles (47 km), the three-way concurrency is the longest in the country. From Portage northward, US 51 rejoins I-39, and the Interstate uses its mileposts northward.

Route description

Illinois

Aerial view of I-39 as it passes Minonk, Illinois, April 2012

In Illinois, I-39 begins at I-55 north of Bloomington–Normal, Illinois, less than one mile east from the intersection of I-74 and I-55 that runs around the city of Normal. US 51 splits from I-55, joining I-39; exit 2 marks the northern terminus of the US 51 business route. From Normal northward, I-39 runs northward largely through rural areas. At exit 8, the route forms the southern terminus of Illinois Route 251 (IL 251), which was derived from the original routing of US 51.

In Oglesby in central LaSalle County, I-39 passes next to Starved Rock State Park, the busiest state park in Illinois. North of the park, it crosses the Illinois River over the Abraham Lincoln Memorial Bridge; at 1.3 miles (2.1 km) long, it is the longest bridge in the state. Just north of the river, I-39 passes between the cities of LaSalle and Peru; as it intersects I-80 and US 6, it makes its southernmost connections with the Chicago region. North of I-80, the wind turbines of the Mendota Hills Wind Farm (the first commercial wind farm in Illinois) can be seen from milepost 72 at Mendota north to near Paw Paw. As I-39 continues northward, I-39 also intersects US 52 and US 30.

In Ogle County, I-39 intersects with I-88 (IL 110), connecting I-39 to both Chicago and the Quad Cities regions. As it intersects IL 38, IL 64, and IL 72, I-39 connects with the DeKalb–Sycamore region and far west suburbs of the Chicago area.

As I-39 crosses into Winnebago County, the Baxter Road exit (exit 115) is the final exit before I-39 joins the US 20 freeway bypass in Rockford. Approximately a mile east of the Alpine Road/US 20 interchange, I-39 joins US 20, moving from nearly entirely farmland to medium-density populated areas.

After heading northeast for approximately four miles (6.4 km), US 20 splits from I-39/US 51; a mile northward, I-39/US 51 runs concurrently with I-90 (Jane Addams Memorial Tollway). Though signed as I-39/I-90, the concurrency follows the mileposts of I-90. Though I-39 itself is not tolled, the Illinois Tollway collects tolls on the I-90 portion, including two ramp interchanges and an open-road toll plaza between Rockton and South Beloit.

At exit 1 (IL 75) in South Beloit, US 51 splits from I-39 to join IL 75; two miles (3.2 km) westward, it continues the route of IL 251 into Wisconsin. For all but one mile that I-39 is in Illinois, it runs concurrently with US 51.

Wisconsin

I-39/US 51 in northern Wisconsin
Northern terminus of I-39 at the interchange with WIS 29 near Wausau

I-39 enters Wisconsin in Rock County, concurrently with I-90. Bypassing Beloit to the east, it passes underneath the County Trunk Highway P bridge (CTH-P, Stateline Road). The tri-stack exit 185 provides access to Beloit through WIS 81 and serves as the southern terminus of I-43 (accessing Milwaukee and Green Bay). The northernmost interchange serving the Beloit region is CTH-S (Shopiere Road) at exit 183. About seven miles (11 km) north of the I-43 interchange, I-39/I-90 is joined by WIS 11 for two miles (3.2 km) as it bypasses Janesville. In addition to the northern interchange that holds WIS 11, Janesville is also accessed by US 14 and WIS 26 (Milton Avenue). After crossing the Rock River, I-39/I-90 has an interchange with WIS 59, connecting it with Edgerton (to the west) and Milton (to the southeast).

I-39 enters Dane County north of WIS 59, passing west of Lake Koshkonong. For approximately four miles (6.4 km), US 51 rejoins the Interstate (from mile 160 to 156) before it heads west through Stoughton. I-39/I-90 changes direction north of Utica, gradually turning northwest. At exit 142, the highway turns returns north as it meets US 12/US 18 in Madison, forming the eastern terminus of the Madison Beltline Highway; for approximately 650 feet (200 m), northbound I-39 is reduced to two lanes (for the first time since Cherry Valley, Illinois). North of the Beltline, I-39 accesses Madison through an interchange with WIS 30 and I-94 (routed from Milwaukee); the interchange is known as the Badger Interchange. Two miles (3.2 km) further north, the highway has an interchange with US 151 (splitting Madison and Sun Prairie); the northernmost Madison-area I-39 interchanges are US 51 (Madison and DeForest) and WIS 19 (Sun Prairie and Waunakee); CTH-V (West North Street) for DeForest serves as the last Dane County exit.

I-39/I-90/I-94 enters Columbia County four miles (6.4 km) north-northwest of CTH-V. From the county line northward, the highway returns to rural surroundings. Three miles (4.8 km) after crossing the Wisconsin River, exit 108 (Wisconsin Dells) splits I-90/I-94 from I-39. For the first time since the US 20 Bypass in Rockford–Cherry Valley, I-39 is four lanes instead of six or eight. I-39 continues northward from WIS 78 (which terminates at the interchange), routed towards Portage. I-39 connects with Portage through WIS 33, crosses the Wisconsin River a second time, connects with WIS 16; a third interchange rejoins I-39 with US 51. I-39 takes on the mileposts of the latter.

After taking on US 51, I-39 continues northward, with few directional changes through Marquette County and Waushara County. In Portage County, the highway continues its northward direction until it reaches the Stevens Point region, where it bypasses the city to the east and north; four interchanges connect with the city (CTH-HH, US 10/WIS 66, Stanley Street, and Bus. US 51).

From Stevens Point northward, I-39 largely parallels the path of the Wisconsin River and Lake DuBay. Following its entrance into Marathon County, WIS 153 connects to I-39 in Mosinee, adjacent to the Central Wisconsin Airport. The final north-south interchange of I-39 is exit 185 (Bus. US 51) in Rothschild, just before I-39 crosses the Wisconsin River.

I-39 ends with exit 187, as WIS 29 merges with US 51 (for approximately four miles ); the latter highway continues north to its terminus at US 2 at the Wisconsin–Michigan border.

History

Illinois

When the Interstate Highway System was first being planned, Illinois made a request for a north–south highway from South Beloit to Salem. The project was deemed a low priority and was shelved. US 51, which ran mostly down the middle of the state, became a heavily traveled two-lane arterial road, experiencing many crashes and earning the nickname "Killer 51".

In the late 1960s and early 1970s, a major supplemental freeway system plan was proposed, with the goal of providing Illinois residents access to freeways within 30 minutes or less. One of the proposed routes, FAP 412, was a route that would extend from US 20 in Rockford to I-57 just north of Salem, similar to the earlier requested route. Due to traffic counts, only the portion between Rockford and Decatur was prioritized.

Over the course of the 1970s, planning for the US 51 supplemental freeway took place in earnest. However, debate ensued over what type of highway should be built. The Illinois Department of Transportation (IDOT) wanted the entire highway built to Interstate Highway standards, but a transportation committee established to review the proposed supplemental freeway system recommended only Interstate construction between Rockford and I-80. The highway from Oglesby south to Decatur was recommended to be an at-grade expressway, utilizing the existing road where possible. After a decade of lobbying by interest groups, it was announced in 1986 that US 51 would be rebuilt to Interstate standards from Oglesby to Normal. However, due to funding concerns and local opposition, it was decided that the Bloomington to Decatur segment would not be built to Interstate standards; this segment was made a four-lane expressway.

The first segment of the freeway opened 1984 from IL 5 (now I-88) in Rochelle, to US 20 in Rockford. When the freeway was completed south from IL 5 to I-80 in 1986, IDOT officially requested an Interstate designation for the new highway, and I-39 was officially designated. By December 1987, construction on the section of I-39 between I-80 and IL 251 was finished. The next section, between IL 251 and I-55 in Bloomington–Normal, was completed by 1992, although this stretch of the highway was opened in several phases as completed. In December 1989, the section from Bloomington–Normal to Hudson opened, a distance of about 4.4 miles (7.1 km). In early September 1992, another segment opened from IL 116 north to IL 17.

Wisconsin

In Wisconsin, the highway was officially designated in 1992. In October 1993, the American Association of State Highway and Transportation Officials (AASHTO) established part of I-39 in its northern section between Rockford and Rib Mountain, Wisconsin, then designated I-39 along existing portions of I-90, I-94, and US 51. However, this part of the highway was not marked as I-39 for another four years, primarily because the Wisconsin Department of Transportation (WisDOT) had to reconstruct the interchange connecting I-90 and I-94 with WIS 78 near Portage. Signs denoting I-39 were placed along the highway in Wisconsin until 1996, when the section between Portage and Rib Mountain (near Wausau) received its signs. This occurred after then–Governor Tommy Thompson designated the stretch between Portage and Wausau in 1996 after a five-year push to get the Interstate designation approved. The remaining segment along I-90/I-94 was not signed for I-39 until late 1998. The section between the I-90/I-94 interchange and US 51's interchange in Portage was previously a part of WIS 78. That route was truncated back to its current terminus when the Interstate's designation went into effect. The designation of I-39 violated Wisconsin's rule of not having any state trunk highway number duplicated—Interstate, US, or state—as WIS 39 already existed.

Exit list

StateCountyLocationmikmExitDestinationsNotes
IllinoisMcLeanNormal0.000.00—

I-55 / US 51 south to I-74 – Chicago, St. Louis, Decatur, Peoria, Champaign		Southern terminus of I-39; southern end of US 51 concurrency; I-55 exit 164; Central Illinois Regional Airport
1.532.462

US 51 Bus. south (Main Street) – Bloomington, Normal
Hudson4.677.525 CR 12 (Franklin Street) – Hudson
Hudson Township7.7512.478
IL 251 north / CR 8 (Lake Bloomington Road) – Kappa		Southern terminus of IL 251
WoodfordEl Paso14.3523.0914 US 24 – Peoria, El Paso
Woodford22.3736.0022 IL 116 – Peoria, Pontiac
Minonk26.9443.3627 CR 2 – Minonk
MarshallWenona35.0256.3635 IL 17 – Lacon, Wenona
LaSalleLostant41.6066.9541 IL 18 – Henry, Streator
Tonica48.6778.3348 CR 54 (Reed Richardson Road) – Tonica
Eden Township51.7083.2051 IL 71 – Hennepin, Oglesby, Granville
52.4784.4452 IL 251 – Peru, LaSalle
Oglesby53.7986.5754Walnut Street – Oglesby
Illinois RiverAbraham Lincoln Memorial Bridge
La Salle56.7591.3357 US 6 (5th Street) – LaSalle, Peru, Ottawa
58.68–
59.46		94.44–
95.69		59 I-80 – Chicago, Des Moines, LaSalle, PeruSigned as exits 59A (east) and 59B (west); I-80 exit 79
Troy Grove66.16106.4766 US 52 – Troy Grove
Mendota72.09116.0272 US 34 – Mendota, Earlville
LeePaw Paw82.57132.8882 CR 10 (Chicago Road) – Paw Paw
Willow Creek Township87.34140.5687 US 30 – Sterling, Rock Falls, Aurora
Steward93.34150.2293 CR 2 (Perry Road) – Steward
OgleRochelle97.10–
97.79		156.27–
157.38		97

I-88 Toll / IL 110 (CKC) (Ronald Reagan Memorial Tollway) – Moline, Rock Island, Chicago		Signed as exits 97A (east) and 97B (west); I-88 exit 78
99.46160.0799 IL 38 / Lincoln Highway – DeKalb, Rochelle
Lynnville Township104.50168.18104 IL 64 – Sycamore, Oregon
Monroe Center110.98178.60111 IL 72 – Genoa, Byron, Kingston
WinnebagoRockford Township115.49185.86115 CR 11 (Baxter Road)
Rockford119.05–
119.56		191.59–
192.41		—
US 20 west (Rockford Bypass) – Rockford, Freeport		Southern end of US 20 concurrency; Chicago Rockford International Airport
Cherry Valley122.17196.61122A
US 20 east – Belvidere		Northern end of US 20 concurrency
122BHarrison Avenue
122.90197.79—

I-90 Toll east (Jane Addams Memorial Tollway) – Chicago		Southern end of I-90 concurrency; I-90 exit 17; I-39 uses I-90's exit numbers from here north
Rockford124.45200.2815
US 20 Bus. (State Street)		Last free exit northbound
127.77205.6312
CR 55 west (East Riverside Boulevard)		Toll on northbound exit and southbound entrance
Machesney Park131.31211.328 IL 173 (West Lane Road) – Machesney ParkToll on northbound exit and southbound entrance
Rockton136.71220.01South Beloit Toll Plaza 1
South Beloit137.53221.333 CR 9 (Rockton Road)Last free exit southbound; northwestern end of Jane Addams Memorial Tollway
139.93225.201
US 51 north / IL 75 – South Beloit		Northern end of US 51 concurrency
 140.25
0.00		225.71
0.00		Illinois–Wisconsin state line
WisconsinRockTown of Turtle2.483.99185B
I-43 north – Milwaukee		I-43 exits 0A-B southbound; former cloverleaf interchange; undergoing conversion to tri-stack interchange.
2.463.96185A
WIS 81 west (Milwaukee Avenue) – Beloit		Former cloverleaf interchange; undergoing conversion to diverging diamond interchange for access to/from 43 via County route X.
4.787.69183 CTH-S (Shopiere Road)
Town of La Prairie9.9516.01177
WIS 11 west (Avalon Road) – Janesville, Avalon		Southern end of WIS 11 concurrency; Southern Wisconsin Regional Airport
Janesville12.4920.10175




Alt. I-39 north / Alt. I-43 north (Racine Street) / WIS 11 east – Delavan		Northern end of WIS 11 concurrency; former Bus. US 14
15.61–
15.66		25.12–
25.20		171B

Alt. I-39 south / US 14 – Janesville		Formerly split into exits 171B (west) and 171C (east)
16.4126.41171A WIS 26 – Milton
Town of Fulton24.6239.62163 WIS 59 – Edgerton, Milton, Whitewater
DaneTown of Albion27.6044.42160
US 51 south / WIS 73 / WIS 106 – Edgerton, Deerfield		Southern end of US 51 concurrency
Town of Christiana31.3050.37156
US 51 north – Stoughton		Northern end of US 51 concurrency
Town of Pleasant Springs40.4065.02147 CTH-N – Stoughton, Cottage Grove
Town of Blooming Grove45.5473.29142 US 12 / US 18 (Beltline Highway) – Madison, CambridgeSigned as exits 142A (west) and 142B (east); US 12 exit 267
Madison49.3979.49138B
WIS 30 west – Madison		Left exit and entrance northbound; serves Dane County Airport; WIS 30 exit 3 eastbound and exit 240A westbound
49.7480.05138A
I-94 east – Milwaukee		Left exit and entrance southbound; southern end of I-94 concurrency; I-94 exit 240
51.7483.27135CHigh Crossing BoulevardNorthbound exit and southbound entrance
51.96–
52.00		83.62–
83.69		135B
US 151 north – Sun Prairie		Cloverleaf interchange
135A
US 151 south – Madison
Town of Burke55.2088.84132 US 51 (Stoughton Road) – Madison, De Forest
Community of Windsor56.6891.22131 WIS 19 – Waunakee, Sun Prairie
Town of Vienna60.9398.06126 CTH-V – Dane, De Forest
ColumbiaTown of Arlington67.97109.39119 WIS 60 – Lodi, Arlington, Columbus
Town of Dekorra71.99115.86115 CTH-CS – Poynette, Lake Wisconsin
Town of Caledonia78.63126.54—

I-90 west / I-94 west – Wisconsin Dells		Northern end of I-90/I-94 concurrency; I-90 exit 108B
79.26127.5684
WIS 78 south – Merrimac		Signed as exit 108A northbound
79.73128.3185Cascade Mountain Road
Portage81.73131.5387 WIS 33 (Cook Street) – Portage, Baraboo
84.13135.3989
WIS 16 (Wisconsin Street) to WIS 127 – Portage, Wisconsin Dells, Columbus		Signed as exits 89A (east) and 89B (west) northbound
Town of Fort Winnebago85.79138.0792
US 51 south (New Pinery Road) – Portage		Southern end of US 51 concurrency; exit numbers from here north based on US 51's mileposts
MarquetteTown of Moundville94.43151.97100
WIS 23 west / CTH-P – Wisconsin Dells, Endeavor		Southern end of WIS 23 concurrency
Town of Oxford98.61158.70104 CTH-D – PackwaukeeNorthbound exit and southbound entrance
100.77162.17106

WIS 23 east / WIS 82 west – Oxford, Montello, Princeton, Packwaukee		Northern end of WIS 23 concurrency
Westfield107.32172.71113 CTH-E / CTH-J – Westfield, Harrisville, Princeton
WausharaColoma118.29190.37124 WIS 21 – Coloma, Necedah, Wautoma, Oshkosh, Tomah
Town of Hancock125.35201.73131 CTH-V – Hancock
Town of Plainfield130.94210.73136 WIS 73 – Plainfield, Wisconsin Rapids, Wautoma, Nekoosa
PortageTown of Pine Grove134.07215.76139 CTH-D – Almond
137.56221.38143 CTH-W – Bancroft, Wisconsin Rapids
Town of Plover145.91234.82151
WIS 54 (Post Road) / Bus. US 51 – Wisconsin Rapids, Plover, Waupaca
Village of Plover147.51237.39153 CTH-B (Plover Road) – Wisconsin Rapids, Plover, Amherst
150.53242.25156 CTH-HH (McDill Avenue) – Whiting, Stevens Point
Stevens Point152.71245.76158

US 10 east / WIS 66 west (Main Street) – Stevens Point, Waupaca, Appleton, Marshfield		Southern end of US 10 concurrency; southern end of WI 66 concurrency; signed as exits 158A (east) and 158B (west) northbound
153.94247.74159
WIS 66 east (Stanley Street) – Stevens Point, Rosholt		Northern end of WI 66 concurrency
155.76250.67161
Bus. US 51 (Division Street) – Stevens Point
Hull157.63253.68163Casimir RoadTo CTH-X
159.75257.09165
US 10 west – Marshfield		Northern end of US 10 concurrency
CTH-XFormer diamond interchange; removed for construction of US 10 exit
Town of Dewey165.39266.17171 CTH-DB – Knowlton, Lake DuBay
MarathonTown of Knowlton169.64273.01175 WIS 34 (Balsam Road) – Knowlton, Wisconsin Rapids
Mosinee173.57279.33179 WIS 153 – Mosinee, ElderonCentral Wisconsin Airport
Kronenwetter175.39282.26181Maple Ridge Road
Rothschild179.52288.91185
Bus. US 51 – Rothschild, Kronenwetter
Village of Rib Mountain182.14293.13187
WIS 29 east – Weston, Green Bay


US 51 north / WIS 29 west – Wausau, Chippewa Falls		Northern terminus; northern end of US 51 concurrency; freeway continues as US 51/WIS 29
1.000 mi = 1.609 km; 1.000 km = 0.621 mi

See also

References

  1. ^ Starks, Edward (January 27, 2022). "Table 1: Main Routes of the Dwight D. Eisenhower National System of Interstate and Defense Highways". FHWA Route Log and Finder List. Federal Highway Administration. Retrieved December 6, 2023.
  2. "Overview Map of I-39" (Map). Google Maps. Retrieved February 15, 2008.
  3. "Illinois Highway Ends - I-39". web.archive.org. October 11, 2012. Retrieved January 13, 2025.
  4. Illinois Technology Transfer Center (2006). "T2 GIS Data". Illinois Department of Transportation. Retrieved November 8, 2007.
  5. Federal Highway Administration. "Structure 000050019120847". National Bridge Inventory. Federal Highway Administration. Archived from the original on January 1, 2014. Retrieved June 1, 2012.
  6. ^ Wisconsin Department of Transportation (2013). Official State Highway Map (PDF) (Map) (2013–2014 ed.). 1:823,680. Madison: Wisconsin Department of Transportation. Retrieved February 5, 2023.
  7. Buschkopf, Jim. "I-94 reconstruction to be discussed September 19" (Press release). Wisconsin Department of Transportation. Archived from the original on August 27, 2008. Retrieved January 12, 2007.
  8. Simpson, Kevin (November 3, 2002). "Rescuers Remember Killer Road". The Pantagraph. Bloomington, Illinois. p. 1. Retrieved September 12, 2022 – via Newspapers.com.
  9. Illinois Department of Transportation (April 12, 1978). Priority Primary Routes (PDF) (Map). Illinois Department of Transportation. Retrieved March 23, 2010.
  10. Wills, Bill (August 27, 1976). "Sides Square Off in Hearings on Freeway". The Pantagraph. Bloomington, Illinois. p. 3. Retrieved September 12, 2022 – via Newspapers.com.
  11. Featherly, Marc (March 11, 1986). "Close Encounters on US 51 Trip". The Pantagraph. Bloomington, Illinois. pp. A1, A5. Retrieved September 12, 2022 – via Newspapers.com.
  12. "Politics Helped Shelve US 51 Work". The Pantagraph. Bloomington, Illinois. p. 34. Retrieved September 12, 2022 – via Newspapers.com.
  13. "Interstate 39". Interstate Guide. AA Roads. July 29, 2008. Archived from the original on May 14, 2012. Retrieved January 11, 2009.
  14. Weingroff, Richard (October 15, 2013). "Part I: History". The Dwight D. Eisenhower System of Interstate and Defense Highways. Federal Highway Administration. "Interstate Route Additions Under 23 U.S.C. 139(a) As of 12/31/97" (table). Retrieved March 7, 2015.
  15. Carlson, Rich (November 18, 2007). "Routes 21 through 40". Illinois Highways Page. Retrieved January 11, 2009.
  16. Zehr, Melissa (March 8, 1991). "Interstate 39: Crews Work to Link Highway by 1992". The Pantagraph. Bloomington, Illinois. p. 3. Retrieved September 12, 2022 – via Newspapers.com.
  17. Davis, Jenni (September 2, 1992). "I-39 Nearly Finished; 12 More Miles Open Today". Peoria Journal-Star – via Newsbank.
  18. ^ Bessert, Chris (January 2, 2008). "Highways 30-39". Wisconsin Highways. Self-published. Retrieved January 12, 2008.
  19. ^ Walters, Steven (January 16, 1996). "US 51 will become I-39 between Portage, Wausau". Milwaukee Journal Sentinel. Retrieved January 12, 2008.
  20. Bessert, Chris (January 2, 2008). "Highways 70-79". Wisconsin Highways. Self-published. Retrieved January 12, 2008.
  21. Wisconsin State Trunk Highway Logs:
    • Southwest Region Staff (December 31, 2008). State Trunk Highway Log for Southwest Region (XLS). Madison, WI: Wisconsin Department of Transportation. 039N.
    • North Central Region Staff (December 31, 2008). State Trunk Highway Log for North Central Region (XLS). Rhinelander, WI: Wisconsin Department of Transportation. 039N.
  22. Wisconsin Department of Transportation. "Exit numbers on US 51 and I-39". Exit numbers on Wisconsin's freeways. Wisconsin Department of Transportation. Archived from the original on June 7, 2007. Retrieved June 30, 2007.
  23. Wisconsin Department of Transportation (December 31, 2017). Designated Freeways & Expressways (PDF) (Map). Scale not given. Madison: Wisconsin Department of Transportation. Retrieved April 4, 2020.

External links

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