Williamson County, IL

204 public highway bridges

Williamson County Bridge Snapshot

Williamson County, Illinois contains 204 public highway bridges in the FHWA National Bridge Inventory. Roughly 61.8% are rated “Good,” 24% “Fair,” 1.5% “Poor,” and 1.5% are classified as structurally deficient — the federal designation for spans whose deck, superstructure, or substructure has been rated 4 or below on the 0–9 NBI scale. Structurally deficient does not mean unsafe to cross; it means the bridge is on the priority list for repair or replacement.

Inspections in IL are conducted by certified engineers from the state Department of Transportation on a 24-month cycle, and results are reported back to the FHWA each spring. The list below shows every NBI-tracked bridge in the county, sorted by inventory load rating. Use the “Sort by” controls to surface the lowest-rated spans first, and click any row for full inspection history, traffic counts, and condition trends.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

204

Total Bridges

61.8%

Good

1.5%

Poor

1.5%

Structurally Deficient

Condition Distribution

Good

61.8% (126)

Fair

24% (49)

Poor

1.5% (3)

SD

1.5% (3)

All Bridges (204)

Sort:

BNSF RR

Over: INTERSTATE 57

1.6 MI S OLD RTE 13, Williamson, IL

Built 1959 ADT: 34,700

ILL 148 EXIT 45

Over: INTERSTATE 57

0.6 MI W OF ILL 37, Williamson, IL

Built 1960 ADT: 34,700

FAS 903 (CH 2)

Over: INTERSTATE 57

AT WCL JOHNSTON CITY, Williamson, IL

Built 1961 ADT: 43,200

FAS 1900 (CH 25)

Over: FAI 57

1.4 MI W OF ILL 37, Williamson, IL

Built 1959 ADT: 34,700

TR 23 (STIRITZ RD)

Over: INTERSTATE 57

0.6 MI W OF ILL 37, Williamson, IL

Built 1961 ADT: 43,200

TR 241 (CEDAR GROV

Over: INTERSTATE 57

0.9 MI W OF ILL 37, Williamson, IL

Built 1961 ADT: 41,300

CH 4 (STOTLAR RD)

Over: INTERSTATE 57

0.7 MI W OF ILL 37, Williamson, IL

Built 1961 ADT: 41,300

I-24 RAMP 0.94

Over: I-57

PULLEY'S MILL INTER, Williamson, IL

Built 1972 ADT: 32,000

I 24 EB

Over: INTERSTATE 57

PULLEY'S MILL INTER, Williamson, IL

Built 1972 ADT: 15,800

I 57 NB

Over: OLD ROUTE 13

IN MARION, Williamson, IL

Built 2009 ADT: 11,800

I 57 SB

Over: OLD ROUTE 13

IN MARION, Williamson, IL

Built 2009 ADT: 11,800

I-57 NB

Over: IL 13

S OF NCL MARION, Williamson, IL

Built 2013 ADT: 24,900

I-57 SB

Over: IL 13

S OF NCL MARION, Williamson, IL

Built 2013 ADT: 25,900

THE HILL AVE

Over: I-57

0.47MI E HALFWAY RD, Williamson, IL

Built 2008 ADT: 41,300

WB IL 13

Over: MARATHON DR

MARION, Williamson, IL

Built 2015 ADT: 750

EB IL 13

Over: MARATHON DR

MARION, Williamson, IL

Built 2014 ADT: 750

MORGAN AVE TO I-57

Over: IL 13

S OF NCL MARION, Williamson, IL

Built 2015 ADT: 3,850

I-57NB TO MORGAN A

Over: IL 13 EB TO I-57 NB

S OF NCL MARION, Williamson, IL

Built 2015 ADT: 800

WOLF CREEK RD

Over: IL 13

CRAINVILLE, Williamson, IL

Built 2017 ADT: 23,200

WESTMINSTER DR

Over: I-57

0.25 MI E WCL MARION, Williamson, IL

Built 2023 ADT: 2,250

ICG R.R.

Over: FAS 903

1 MI. W. SALINE CO., Williamson, IL

Built 1900 ADT: 450

B.N. R.R.

Over: FAS 1900

1 MI. W. ILL. 37, Williamson, IL

Built 1900 ADT: 1,100

B.N. R. R.

Over: OLD ROUTE 13

W. C.L. MARION, Williamson, IL

Built 1900 ADT: 7,900

ICG RR

Over: TR 9

FRANKLIN CO. L., Williamson, IL

Built 1900 ADT: 100

B.N. R.R.

Over: TR 385

0.5 MI. E. I-57, Williamson, IL

Built 1900 ADT: 50

CNIC RR

Over: FAP 331-IL 13

0.25 MI W SALINE CO, Williamson, IL

Built 1998 ADT: 9,000

GRASSY ROAD

Over: LITTLE GRASSY LK SPILLWY

10.0 MI SW OF HDQRTRS, Williamson, IL

Built 1939 Load: 7.3 t ADT: 800

TR 608

Over: MINE HAULAGE ROAD

1 MI N OF ILL 13, Williamson, IL

Built 1978 Load: 16.5 t ADT: 250

WOLF CREEK ROAD

Over: CRAB ORCHARD LAKE

2.5 MI SW OF HDQRTRS, Williamson, IL

Built 1938 Load: 17.2 t ADT: 150

CS 7000 OFF FAS 90

Over: DRAINAGE DITCH

0.7 M W JOHNSTON CIT, Williamson, IL

Built 1956 Load: 19.8 t ADT: 800

NO. DEVILS KITCHEN

Over: GRASSY CREEK

SEC 16 T10S R1E, Williamson, IL

Built 1959 Load: 20.0 t ADT: 200

FAS 904

Over: CRAB ORCHARD CREEK

0.67 MI SO PITTSBURG, Williamson, IL

Built 1972 Load: 22.7 t ADT: 2,850

WILDCAT DRIVE

Over: TRIB TO CRAB ORCH CK

SOUTH EDGE OF MARION, Williamson, IL

Built 1980 Load: 24.3 t ADT: 2,700

BOYTON ST

Over: DRAINAGE DITCH

BOYTON E OF PARK DR, Williamson, IL

Built 1967 Load: 24.3 t ADT: 2,400

FAS 903 (UNMARKED)

Over: BEAR CREEK

2 MI W JOHNSTON CITY, Williamson, IL

Built 1956 Load: 24.9 t ADT: 6,000

FAS 903 (UNMARKED)

Over: LAKE CREEK

1 MI W JOHNSTON CITY, Williamson, IL

Built 1956 Load: 25.6 t ADT: 6,000

TR 4

Over: STREAM

N E CORNER W'SON CO, Williamson, IL

Built 1900 Load: 28.2 t ADT: 75

ILL 148

Over: MIDDLE WOLF CREEK

2.3 MI N OF I-57, Williamson, IL

Built 1962 Load: 29.2 t ADT: 5,600

ILL 166

Over: S FORK SALINE RELIEF

3.3 MI S OF ILL 13, Williamson, IL

Built 1934 Load: 29.8 t ADT: 3,000

ILL 148

Over: BIG MUDDY RIVER

0.1 MI S FRANKLIN CO, Williamson, IL

Built 1931 Load: 30.1 t ADT: 3,650

ILL 166

Over: STREAM

2.7 MI SO OF ILL 13, Williamson, IL

Built 1934 Load: 31.1 t ADT: 3,000

ILL 13 EB

Over: CRABORCHARD CREEK

1 MI E OF MARION, Williamson, IL

Built 1962 Load: 32.1 t ADT: 13,800

ILL 13 WB

Over: CRABORCHARD CREEK

1 MI E OF MARION, Williamson, IL

Built 1962 Load: 32.1 t ADT: 13,800

TR 29

Over: POND CREEK

2 MI. NW CORINTH, Williamson, IL

Built 1977 Load: 32.4 t ADT: 75

TR 423

Over: LITTLE GRASSY CREEK

6 MI SW OF CARTERVIL, Williamson, IL

Built 1978 Load: 32.4 t ADT: 650

TR 509

Over: LITTLE WOLF CREEK

3 MI NW PULLEYS MILL, Williamson, IL

Built 1986 Load: 32.4 t ADT: 25

TR 278

Over: LITTLE SALINE CREEK

0200N-1050E, Williamson, IL

Built 1990 Load: 32.4 t ADT: 50

TR 552

Over: POND CREEK

5 MI N OF PITTSBURG, Williamson, IL

Built 1994 Load: 32.4 t ADT: 125

OLD IL 13-MAIN ST

Over: STREAM AT ECL MARION

NEAR ECL OF MARION, Williamson, IL

Built 2003 Load: 32.4 t ADT: 3,800

CH 13/S MARKET ST

Over: CRAB ORCHARD CR

AT SCL MARION, Williamson, IL

Built 1986 Load: 33.0 t ADT: 3,550

Read our methodology — how this data is sourced, computed, and verified.

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Data sourced from official U.S. government datasets. See our methodology for details. Retrieved and formatted by PlainBridges Editorial

Reviewed byPlainbridges Editorial, Plain Bridges Editorial Team · June 6, 2026