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Interstate 39
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=== Wisconsin === [[File:Interstate39NorthernWisconsinForest.jpg|left|thumb|I-39/US 51 in northern Wisconsin]] [[File:I39_northern_terminus.jpg|thumb|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 [[Wisconsin Highway 81|WIS 81]] and serves as the southern terminus of [[Interstate 43|I-43]] (accessing Milwaukee and Green Bay).<ref name="wisdot132">{{cite WisDOT map|year=2013}}</ref> The northernmost interchange serving the Beloit region is CTH-S (Shopiere Road) at exit 183. About {{convert|7|mi|km|spell=in}} north of the I-43 interchange, I-39/I-90 is joined by [[Wisconsin Highway 11|WIS 11]] for {{convert|2|mi|km|spell=in}} as it bypasses [[Janesville, Wisconsin|Janesville]]. In addition to the northern interchange that holds WIS 11, Janesville is also accessed by [[U.S. Route 14 in Wisconsin|US 14]] and [[Wisconsin Highway 26|WIS 26]] (Milton Avenue). After crossing the [[Rock River (Mississippi River tributary)|Rock River]], I-39/I-90 has an interchange with [[Wisconsin Highway 59|WIS 59]], connecting it with [[Edgerton, Wisconsin|Edgerton]] (to the west) and [[Milton, Wisconsin|Milton]] (to the southeast).<ref name="wisdot132" /> I-39 enters [[Dane County, Wisconsin|Dane County]] north of WIS 59, passing west of [[Lake Koshkonong]]. For approximately {{convert|4|mi|km|spell=in}}, US 51 rejoins the Interstate (from mile 160 to 156) before it heads west through [[Stoughton, Wisconsin|Stoughton]]. I-39/I-90 changes direction north of [[Utica, Dane County, Wisconsin|Utica]], gradually turning northwest. At exit 142, the highway turns returns north as it meets [[U.S. Route 12 in Wisconsin|US 12]]/[[U.S. Route 18 in Wisconsin|US 18]] in Madison, forming the eastern terminus of the Madison Beltline Highway; for approximately {{convert|650|ft|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 [[Wisconsin Highway 30|WIS 30]] and [[Interstate 94 in Wisconsin|I-94]] (routed from Milwaukee); the interchange is known as the Badger Interchange.<ref name="wisdot_badger_int2">{{cite press release |title=I-94 reconstruction to be discussed September 19 |publisher=Wisconsin Department of Transportation |url=http://www.dot.wisconsin.gov/opencms/export/nr/modules/news/news_0396.html_786229440.html |last=Buschkopf |first=Jim |access-date=January 12, 2007 |archive-url=https://web.archive.org/web/20080827230235/http://www.dot.wisconsin.gov/opencms/export/nr/modules/news/news_0396.html_786229440.html |archive-date=August 27, 2008}}</ref> {{convert|2|mi|km|spell=In}} further north, the highway has an interchange with [[U.S. Route 151|US 151]] (splitting Madison and [[Sun Prairie, Wisconsin|Sun Prairie]]); the northernmost Madison-area I-39 interchanges are US 51 (Madison and [[DeForest, Wisconsin|DeForest]]) and WIS 19 (Sun Prairie and [[Waunakee, Wisconsin|Waunakee]]); CTH-V (West North Street) for DeForest serves as the last Dane County exit. I-39/I-90/I-94 enters [[Columbia County, Wisconsin|Columbia County]] {{convert|4|mi|km|spell=in}} north-northwest of CTH-V.<ref name="wisdot132" /> From the county line northward, the highway returns to rural surroundings. {{Convert|3|mi|km|spell=In}} after crossing the [[Wisconsin River]], exit 108 ([[Wisconsin Dells, Wisconsin|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 [[Wisconsin Highway 78|WIS 78]] (which terminates at the interchange), routed towards Portage. I-39 connects with Portage through [[Wisconsin Highway 33|WIS 33]], crosses the Wisconsin River a second time, connects with [[Wisconsin Highway 16|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, Wisconsin|Marquette County]] and [[Waushara County, Wisconsin|Waushara County]]. In [[Portage County, Wisconsin|Portage County]], the highway continues its northward direction until it reaches the [[Stevens Point, Wisconsin|Stevens Point]] region, where it bypasses the city to the east and north; four interchanges connect with the city (CTH-HH, [[U.S. Route 10 in Wisconsin|US 10]]/[[Wisconsin Highway 66|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, Wisconsin|Marathon County]], [[Wisconsin Highway 153|WIS 153]] connects to I-39 in [[Mosinee, Wisconsin|Mosinee]], adjacent to the [[Central Wisconsin Airport]]. The final north-south interchange of I-39 is exit 185 ([[U.S. Route 51 Business (Rothschild–Wausau, Wisconsin)|Bus. US 51]]) in [[Rothschild, Wisconsin|Rothschild]], just before I-39 crosses the Wisconsin River. I-39 ends with exit 187, as [[Wisconsin Highway 29|WIS 29]] merges with US 51 (for approximately {{convert|4|mi|km|spell=in|disp=sqbr}}); the latter highway continues north to its terminus at US 2 at the Wisconsin–Michigan border.{{clear left}}
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