Illinois Route 157
IL 157 highlighted in red
Route information
Maintained by IDOT
Length	35.50 mi[1] (57.13 km)
Existed	1926[2]–present
Major junctions
South end	IL 3 in Cahokia
Major intersections	I-255 / US 50 in Cahokia I-64 / US 50 in Fairview Heights I-55 / I-70 / US 40 in Collinsville I-270 in Glen Carbon
North end	IL 140 in Hamel
Location
Country	United States
State	Illinois
Counties	St. Clair, Madison
Highway system
Illinois State Highway System Interstate US State Tollways Scenic
← IL 156 → IL 158

Illinois Route 157 (IL 157) is a 35.50-mile-long (57.13 km) 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 highway is at an intersection with IL 140 in Hamel.

Route description

IL 157 travels concurrent with IL 13 and IL 163 in Centreville and IL 159 and IL 143 in Edwardsville. IL 157 is the major north–south road through the busiest towns in Madison County – Collinsville and Edwardsville.

The segment of the highway in Cahokia Heights from IL 3 to IL 13 is known as Camp Jackson Road.

The segment of the highway north from IL 13 to approximately Interstate 270 (I-270) is known as Bluff Road, because it roughly follows the eastern bluffs of the Mississippi River which define the American Bottoms in Madison and St. Clair counties.

History

State Bond Issue Route (SBI) Route 157 originally traveled from Cahokia to Glen Carbon. It was then extended to the Missouri state line at the Jefferson Barracks Bridge in 1946; this was undone by 1958. In 1965, the northern terminus was moved to Hamel, replacing U.S. Route 66 Bypass (US 66 Byp.), which itself was the US 66 mainline prior to 1957.^[2]

Major intersections

County	Location	mi[3]	km	Destinations	Notes
St. Clair	Cahokia	0.0	0.0	IL 3 / Great River Road – East St. Louis	Southern terminus of IL 157
		2.0	3.2	I-255 / US 50 – Chicago, Memphis	I-255 exit 13
	​	5.1	8.2	IL 163 south (Millstadt Rd) – Millstadt	South end of IL 163 concurrency
	Centreville	5.6	9.0	IL 163 north / IL 13 – Alorton	North end of IL 163 concurrency; south end of IL 13 concurrency; western terminus of IL 13
		6.0	9.7	IL 13 east – Belleville	North end of IL 13 concurrency
		6.8	10.9	IL 15 – East St. Louis, Belleville	interchange
	East St. Louis	9.9	15.9	IL 161 south (St. Clair Ave) – Fairview Heights	Northern terminus of IL 161; interchange
	Caseyville	10.2	16.4	I-64 / US 50 – Mt. Vernon, St. Louis	I-64 exit 9
Madison	Collinsville	16.3	26.2	I-55 / I-70 / US 40 – Chicago, Indianapolis, St. Louis, Memphis	I-55 / I-70 exit 11
	Glen Carbon	20.6	33.2	IL 162 east – Troy	South end of IL 162 concurrency
		20.7	33.3	IL 162 west – Granite City	North end of IL 162 concurrency
		21.7	34.9	I-270 – Effingham, St. Charles	I-270 exit 9
		22.1	35.6	Historic US 66 west (Chain of Rocks Road)	Southwestern end of Historic US 66 overlap
	Edwardsville	27.1	43.6	IL 143 west / IL 159 (Main St)	South end of IL 143 concurrency
		27.6	44.4	IL 143 west (E Vandalia St)	North end of IL 143 concurrency
	Hamel	35.50	57.13	IL 140 (State St) – Alton, Greenville	Northeastern end of Historic US 66 overlap; northern terminus
				Historic US 66 east	Continuation beyond IL 157
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus