Illinois 1 is the longest state route in Illinois, stretching from southern Chicago all the way to the Ohio River at Cave-in-Rock, in the southeastern corner of the state. It straddles the Indiana border for just about its entire length.
Intersections from North to South:
I-57 at Chicago
IL17 East near Grant Park
IL114 at Momence
IL17 West near Sun River Terrace
IL1 joins US24 west
US24 breaks off toward the east
IL9 at Hoopeston
IL119 at its western end and US136 joins IL1 south from the east (picture taken facing north)
US150 joins IL1 from the east as US136 breaks off of IL1 and heads east at Danville
IL16 West and US150 East at Paris
US40 at Marshall
Business US50 at Lawrenceville
IL15 West at Mt. Carmel
IL15 breaks off of IL1 at Mt. Carmel to head east to become IN64
IL130 near Grayville
IL14 comes from the east and joins IL1 south
IL14 West at Carmi
US45 at Norris City
IL141 near Omaha
IL146 at Cave-in-Rock
The southern end of IL1: <>
IL1's southern end is at the Ohio River, at a ferry in Cave-in-Rock. After crossing the ferry, you would end up on Kentucky State Route 91.
IL1 passes through the following towns: Chicago (US12/20, I-57), Riverdale, Harvey (IL83, US6, I-80/294), Homewood, Chicago Heights (US30), Steger, Crete, Goodenow (IL394), Beecher, Grant Park (IL17 East), Momence (IL114), Sun River Terrace (IL17 West), St. Anne, Martinton, Watseka (US24 West),(US24 East), Milford, Wellington, Hoopeston (IL9), Rossville, (US136 West and IL119 East), Danville, South Danville (I-74), Belgium, Westville, Georgetown, Ridge Farm, Chrisman, (US36) Edgar, Paris (IL16 West and US150 East), Oliver, (I-70), Marshall (US40), Gordon (IL33), Flat Rock, Birds, Lawrenceville (US50, Business US50), Allendale, Patton, Mt. Carmel (IL15 both ways), Keensburg, Cowling, Grayville (IL130), (I-64), Calvin, Crossville (IL14 East), Carmi (IL14 West), Norris City (US45), Omaha (IL141), (IL13), Gibsonia, Cave-in-Rock (IL146).
Notable places: The southern end is near Cave-in-Rock State Park, which hosts a cave that pirates would hide inside. These pirates would seize ships heading down the Ohio River.
The northern end of IL1 is an undesirable section of the South Side from what I hear.
