Roads of the Mid-South & West > Highways of the State of Illinois > Illinois State Routes 101-199 > Illinois State Route 121 > Illinois State Route 121, Logan County

Illinois State Route 121
Logan County

Illinois State Route 121 is the main route for southeastern Logan County. IL St Rt 121 around Lincoln has had several routes and end points over the years. At one time, before I-155 was completed, IL St Rt 121 extened north beyond Lincoln. Then when I-155 was completed, IL St Rt was pulled back to the north side of Lincoln to end on Old U.S. Rt. 66 north of IL St Rt 10. Currently, IL St Rt 121 ends on IL St Rt 10 at I-55 on Lincoln's westside.

IL St Rt 121 passes through the following towns in Logan County.
Lincoln
Mount Pulaski


IL St Rt 121 is multi-plexed in Logan County.
Illinois State Route 10, at Lincoln.

BUSN. Loop I-55, at Lincoln.

IL St Rt 121 intersects the following highways in Logan County.
Interstate 55, at Lincoln.
Illinois State Route 10, at Lincoln.
BUSN. Loop I-55, at Lincoln.

BUSN. Loop I-55, at Lincoln.

Illinois State Route 10, at Lincoln.

Illinois State Route 54, at Mount Pulaski.


A journey down the old sections of IL St Rt 121.



EB IL St Rt 121 south of Latham.

EB IL St Rt 121 near Latham.

EB IL St Rt 121 near Mt. Pulaski.

A junction marker on EB IL St Rt 54.

EB IL St Rt 121 near Salt Creek.

EB IL St Rt 121 near Chestervale.

EB IL St Rt 121 east of Lincoln.

A guide marker on the ramp from SB I-55 to SB BUSN. Loop I-55.

A set of junction markers on NB BUSN. Loop I-55.

A set of guide markers on WB IL St Rt 10/NB IL St Rt 121.

Guide signs on SB Lincoln Parkway.

A guide marker on SB Lincoln Parkway.

WB IL St Rt 10/NB IL St Rt 121 west of Lincoln Parkway.

SB IL St Rt 10/NB IL St Rt 121 west of Lincoln Parkway.

EB IL St Rt 10/SB IL St Rt 121 on the westside of Lincoln.

A BGS on SB I-55.

A BGS on SB I-55.

A BGS on NB I-55.

A BGS on NB I-55.

A BGS on the ramp from SB I-55.

A BGS on EB IL St Rt 10 at I-55. This is the start of SB IL St Rt 121. I-155 is less than one mile north of this interchange on I-55, at Lincoln.

The western end in Lincoln. (March, 2006)

The western end marker. (March, 2006)

Western end marker at Lincoln. (2004)

The northern end point. (July, 2014)

The northern end marker. (July, 2014)

23 June 2017