St. Clair County, IL

502 public highway bridges

St. Clair County Bridge Snapshot

St. Clair County, Illinois contains 502 public highway bridges in the FHWA National Bridge Inventory. Roughly 34.7% are rated “Good,” 25.7% “Fair,” 8% “Poor,” and 8% 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.

502

Total Bridges

34.7%

Good

8%

Poor

8%

Structurally Deficient

Condition Distribution

Good

34.7% (174)

Fair

25.7% (129)

Poor

8% (40)

SD

8% (40)

All Bridges (502)

Sort:

I-70 EB

Over: NSRR,TRRA,Industrial Ave

1.4 mi N of I-55/64, St. Clair, IL

Built 2013 ADT: 200

I-70 WB

Over: NSRR,TRRA,Industrial Ave

1.4 mi N of I-55/64, St. Clair, IL

Built 2013 ADT: 200

EB I-70 Flyover Ra

Over: I-55,64,Ramps,KCSRR, CSX

4th level of Quad-Level, St. Clair, IL

Built 2014 ADT: 2,950

EB 70 Ramp to EB 6

Over: I-55 and ramps

Flyover ramp to EB64, St. Clair, IL

Built 2014 ADT: 74,500

WB 64 Ramp to WB 7

Over: I-55/70,Ramps,CSXRR,KCSR

QuadLevel Flyover to 70WB, St. Clair, IL

Built 2014 ADT: 2,950

9TH STREET

Over: FAI 64

East St. Louis, St. Clair, IL

Built 2013 ADT: 74,500

REL IL 3 -Packers

Over: I-70

0.8 mi N of I-55/64, St. Clair, IL

Built 2013 ADT: 44,300

Rel. IL 3 (Packers

Over: St. Clair Ave, TRRA

0.8 mi N of I-55/64, St. Clair, IL

Built 2013 ADT: 3,800

N GREENMOUNT RD

Over: FAI 64

.87 MI S OF US 50, St. Clair, IL

Built 2001 ADT: 58,600

IL 158 NB

Over: Trail,NSRR,Metrolink,Rd

0.5 mi W of Scott AFB, St. Clair, IL

Built 2001 ADT: 25

MLK EB to I-55/64

Over: Reloc IL Rt 3/RR

0.7 mi E of Miss. River, St. Clair, IL

Built 2015 ADT: 1,600

MLK Bridge E Appr.

Over: IL3,TRRA(UPRR),1st,MO Av

0.75 E Mississippi River, St. Clair, IL

Built 2018 ADT: 10

15TH ST-FAU 9155

Over: FAI 64 in E ST Louis

0.79 E OF FAI 70, St. Clair, IL

Built 2012 ADT: 74,500

EXCHANGE AVENUE

Over: I-55/70

E ST L AT BOWMAN YD, St. Clair, IL

Built 2011 ADT: 67,300

E ST L PED BRIDGE

Over: INTERSTATE 64

W of 15th STREET, St. Clair, IL

Built 2010 ADT: 74,500

IL 157

Over: creek,Metrolink,St Clair

1.2 mi S. of I-64, St. Clair, IL

Built 2017 ADT: 19,600

FAU 9212

Over: UPPER CAHOKIA RD.

CAHOKIA AT PARKS AIR, St. Clair, IL

Built 1980 ADT: 250

MLK bridge

Over: Miss.River,TRRA,Front,8t

East St. Louis, St. Clair, IL

Built 1950 ADT: 975

MLK BR APPR EB & W

Over: RAMP TO WB MLK BR

0.1 Mi E 3rd ST EXIT, St. Clair, IL

Built 1961 ADT: 800

FAU 9172

Over: CSX RR AND CITY ST

CITY OF O'FALLON, St. Clair, IL

Built 1998 ADT: 50

SCCTD Metro BK Lin

Over: GREEN MOUNT FAU 9170

.68 M S of IL 161, St. Clair, IL

Built 2013 ADT: 15,600

SCCTD BIKE/PED TRA

Over: IL 161

NEAR SWIC/METRO BR, St. Clair, IL

Built 2014 ADT: 10,400

SCCTD METRO BIKE L

Over: FAU 9257 FULLERTON

.2 MI E of IL 161, St. Clair, IL

Built 2012 ADT: 6,850

TERMINAL R.R.

Over: 9TH ST FAU 9213

E. ST. LOUIS, St. Clair, IL

Built 1900 ADT: 2,450

RAILROAD

Over: FAU 9213 9TH ST

E. ST. LOUIS, St. Clair, IL

Built 1900 ADT: 2,450

A & S RR

Over: ST CLAIR AVE

.8 W ILL 111, St. Clair, IL

Built 1940 ADT: 5,900

ABANDONED ICG

Over: N BELT WEST/FAU 9257

.15 E ILL 13, St. Clair, IL

Built 1900 ADT: 13,900

CSX R.R.

Over: ILL 3

1 M NW I-55-70, St. Clair, IL

Built 1938 ADT: 4,300

CSX R.R.

Over: ILL 3

1 M NW I-55-70, St. Clair, IL

Built 1938 ADT: 4,300

CSX R.R

Over: ILL 3

.5 M NW I-55-70, St. Clair, IL

Built 1938 ADT: 4,300

I.C.& GULF R.R.

Over: FAS 848

NEW ATHENS, St. Clair, IL

Built 1928 ADT: 1,200

SOUTHERN RR

Over: 8TH ST/ FAU 9217B

E ST LOUIS, St. Clair, IL

Built 1936 ADT: 2,350

A & S RR

Over: 8TH ST/ FAU 9217

E ST LOUIS, St. Clair, IL

Built 1918 ADT: 2,350

IC RR

Over: 8TH ST/ FAU 9217B

1.3 M S ILL 15, St. Clair, IL

Built 1937 ADT: 2,350

TRRA R.R.

Over: STATE ST/ FAU 9182

E.ST.LOUIS, St. Clair, IL

Built 1900 ADT: 6,500

A & S RR

Over: 19TH ST/ FAU 9225

E ST LOUIS, St. Clair, IL

Built 1900 ADT: 2,000

RAILROAD

Over: SCHOOL ST/ FAU 9209

EAST CARONDELET, St. Clair, IL

Built 1900 ADT: 1,050

B&O RR

Over: CH 99

1/2 MI. E. OF O'FALL, St. Clair, IL

Built 1900 ADT: 1,650

FAU 9187A & MET LI

Over: MISS RIV/RR/MSS6000

E ST LOUIS, St. Clair, IL

Built 1874 ADT: 700

TRRA&SOUTHERN R.R.

Over: BROADWAY/ FAU 9187A

E.ST.LOUIS, St. Clair, IL

Built 1900 ADT: 9,600

TRRA R.R.

Over: TRENDLEY/ FAU 9187A

E.ST.LOUIS, St. Clair, IL

Built 1900 ADT: 9,600

METROLINK

Over: IL 161

.48MI EAST FAU 9170, St. Clair, IL

Built 2004 ADT: 10,400

METRO LINK

Over: LLEWELYN ROAD

N OF IL 161, St. Clair, IL

Built 1999 ADT: 325

METRO LINK

Over: DUTCH HOLLOW RD

NEAR IL 161, St. Clair, IL

Built 1999 ADT: 625

METRO LINK

Over: ST. CLAIR AVE

.03MI EAST OF 11TH, St. Clair, IL

Built 1999 ADT: 4,500

METRO LINK

Over: 79TH ST

0.01 S OF ST. CLAIR, St. Clair, IL

Built 1999 ADT: 2,850

METRO LINK

Over: FAI 64&BAUGH AVE

1-64/BAUGH AVE, St. Clair, IL

Built 1999 ADT: 1,025

IC RR

Over: ILL 13/ FAU 9251

0.35 M S ILL 157, St. Clair, IL

Built 1930 ADT: 3,250

METRO LINK

Over: IL 159

IN SWANSEA, St. Clair, IL

Built 1999 ADT: 12,000

METRO LINK

Over: E. MAIN ST.

WEST OF IL 161, St. Clair, IL

Built 1999 ADT: 1,400

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 5, 2026