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Interstate 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 length 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.
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.
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Interstate 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 length 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.
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.