Illinois Route 143 is an east–west state

highway A highway is any public or private road or other public way on land. It is used for major roads, but also includes other public roads and public tracks. In some areas of the United States, it is used as an equivalent term to controlled-access ...

in southwestern

Illinois Illinois ( ) is a U.S. state, state in the Midwestern United States, Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolita ...

. Its western terminus is at

U.S. Route 67 U.S. Route 67 is a major north–south U.S. highway which extends for 1,560 miles (2,511 km) in the Central United States. The southern terminus of the route is at the United States-Mexico border in Presidio, Texas, where it continues so ...

(very near, but not at the termini of

Illinois Route 100 Illinois Route 100 (IL-100) is a state highway in the southwest Illinois. It generally parallels the Illinois River. Starting in downtown Alton, it trends northward to Buckheart Township near Canton. It makes up much of the Illinois River Roa ...

and

Illinois Route 140 Illinois Route 140 (IL 140) is a east–west highway with its western terminus at Illinois Route 143 in Alton and its eastern terminus at U.S. Route 40 (US 40) near Mulberry Grove. It also overlaps IL 111 in Alton and IL 127 in Greenvil ...

) in

Alton Alton may refer to: People *Alton (given name) *Alton (surname) Places Australia *Alton National Park, Queensland * Alton, Queensland, a town in the Shire of Balonne Canada * Alton, Ontario *Alton, Nova Scotia New Zealand * Alton, New Zealand, ...

. Its eastern terminus at

Illinois Route 127 Illinois Route 127 is a north–south highway in central and southern Illinois. Its southern terminus is at Illinois Route 3 near Olive Branch and its northern terminus at Interstate 55, along with the southern terminus of Illinois Route 48 in ...

at a rural intersection west of Tamalco. This is a distance of .

Route description

Illinois 143

overlap Overlap may refer to: * In set theory, an overlap of elements shared between sets is called an intersection, as in a Venn diagram. * In music theory, overlap is a synonym for reinterpretation of a chord at the boundary of two musical phrases * O ...

Illinois Route 157 Illinois Route 157 (IL 157) is a north–south state highway in the southwestern part of the U.S. state of Illinois. The southern terminus of the highway is at an intersection with IL 3 in Cahokia. The northern terminus of the hig ...

and

Illinois Route 159 Illinois Route 159 is a north–south state road in southwestern Illinois. Its southern terminus is at Illinois Route 3 and Illinois Route 154 in Red Bud and its northern terminus at Illinois Route 16 in Royal Lakes. This is a distance of . R ...

in Edwardsville, and

Illinois Route 160 Illinois Route 160 is a north–south highway in southwestern Illinois. Its southern terminus is at Illinois Route 15 south of Addieville, and its northern terminus is at Illinois Route 140 east of Alhambra. This is a distance of . Route d ...

and U.S. Route 40 in

Highland Highlands or uplands are areas of high elevation such as a mountainous region, elevated mountainous plateau or high hills. Generally speaking, upland (or uplands) refers to ranges of hills, typically from up to while highland (or highlands) is ...

. It has 4 lanes from IL 140 to just east of

Illinois Route 255 Illinois Route 255 (IL 255), also referred to as the Alton Bypass, is a northwesterly extension of Interstate 255 (I-255) in southwestern Illinois in the St. Louis metropolitan area. IL 255 starts at I-270 in Pontoon Beach and ...

, a portion from around

Southern Illinois University Edwardsville Southern Illinois University Edwardsville (SIUE) is a public university in Edwardsville, Illinois. SIUE was established in 1957 as an extension of Southern Illinois University Carbondale.Butler 1976, p. 18 It is the younger of the two major inst ...

to Edwardsville, and briefly around

Interstate 55 Interstate 55 (I-55) is a major Interstate Highway in the central United States. As with most primary Interstates that end in a five, it is a major cross-country, north–south route, connecting the Gulf of Mexico to the Great Lakes. The h ...

in Edwardsville. The rest of the road is generally rural and has 2 lanes.

History

SBI Route 143 ran from Benton to

Harrisburg Harrisburg is the capital city of the Pennsylvania, Commonwealth of Pennsylvania, United States, and the county seat of Dauphin County, Pennsylvania, Dauphin County. With a population of 50,135 as of the 2021 census, Harrisburg is the List of c ...

; this was replaced by

Illinois Route 34 Illinois Route 34 (IL 34) is a north–south state road in southern Illinois. It runs from a former ferry crossing to Kentucky Route 297 across the Ohio River in Rosiclare to Illinois Routes 14/ 37 in Benton. This is a distance of . Rou ...

when it was extended north in 1937. That same year, IL 143 was applied to a former lettered route,

Illinois Route 127A Illinois ( ) is a state in the Midwestern United States. Its largest metropolitan areas include the Chicago metropolitan area, and the Metro East section, of Greater St. Louis. Other smaller metropolitan areas include, Peoria and Rockfor ...

from Highland to Illinois 127. In 1950, it was extended west to Edwardsville. In 1964, it was extended west again to Alton, replacing

. There have been no changes since. In 1987, the alignments of

Illinois Route 3 Illinois Route 3 (IL 3) is a major north–south arterial state highway in southwestern Illinois. It has its southern terminus at Cairo Junction (about north of Cairo) at the intersection of U.S. Route 51 (US 51) and Illinois Ro ...

, and Illinois Route 143 were switched to their current routes in the Alton area with the opening of the extension of the Homer M. Adams Parkway and the construction of Madison Avenue in Wood River. IL 143 was put on the new Madison Avenue alignment and routed on the Berm Highway, while IL 3 was put back on an older alignment through East Alton and the Homer Adams Parkway (later taking over the old IL 100 alignment north of Godfrey to Grafton), and IL 100 was put on then-unmarked River Road from Alton to Grafton. The old alignment of IL 143 (Alton-Edwardsville Road) became unmarked.

Major Intersections

References

External links

*{{ccat-inline 143 Transportation in Madison County, Illinois Transportation in Bond County, Illinois