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:

FAI 64 WB

Over: ILL 161

1.5 MI W NEW BADEN, St. Clair, IL

Built 1972 ADT: 9,500

FAI 64 RAMP #167&1

Over: ST CLAIR AVE/FAU9166

0.25 MI E OF 25TH ST, St. Clair, IL

Built 1973 ADT: 6,350

Metrolink

Over: 25th St.

0.25 mi N of I-64, St. Clair, IL

Built 1974 ADT: 4,750

IL 3 NB TO EB CD "

Over: I-55/64 EB CD "D" & UPRR

PIER P1 TO PIER H1, St. Clair, IL

Built 1972 ADT: 16,600

I-55/64 WB CD

Over: 4TH ST IN E ST LOUIS

WB CD over 4th St, St. Clair, IL

Built 1965 ADT: 150

Davis St Ferry Rd

Over: FAI 255

1.5 MI. S OF DUPO, St. Clair, IL

Built 1979 ADT: 41,000

S Main St/Old IL 3

Over: FAI 255

0.1MI SE DUPO, St. Clair, IL

Built 1983 ADT: 35,700

IL 3 NB Ramp E

Over: FAI 255

N DUPO, St. Clair, IL

Built 1983 ADT: 500

IL 3 SB Ramp F

Over: FAI 255

N DUPO, St. Clair, IL

Built 1981 ADT: 500

I 255

Over: MCBRIDE AVE/TR12

1/2 mi S of IL 157, St. Clair, IL

Built 1979 ADT: 1,450

FAI 255

Over: ILL 157

0.50 SO OF DORIS AVE, St. Clair, IL

Built 1979 ADT: 7,550

FAI 255

Over: DORIS AVE/FAU 9199

0.5 M N OF ILL 157, St. Clair, IL

Built 1979 ADT: 1,050

FAI 255

Over: JEROME LA FAU 9197

0.5 Mi N OF IL 157, St. Clair, IL

Built 1979 ADT: 1,650

FAI 255

Over: MOUSETTE LN-FAU 9200

0.4 MI NO DORIS AVE., St. Clair, IL

Built 1979 ADT: 2,950

I-255

Over: Church Rd,UPRR,KCSRR

1.25 mi SW of IL 15, St. Clair, IL

Built 1982 ADT: 1,150

FAI 255

Over: BOND AVE

S OF ILL 15/MO.AVE, St. Clair, IL

Built 1979 ADT: 3,350

FAI 255

Over: ILL 15

1.3 MI S OF STATE ST, St. Clair, IL

Built 1981 ADT: 31,800

POCKET RD/ FAU 923

Over: FAI 255

S EDGE FHSP, St. Clair, IL

Built 1981 ADT: 44,300

PARK ROAD TR 515A

Over: I255 & HARDING DITCH

FRANK HOLTEN STATE PARK, St. Clair, IL

Built 1981 ADT: 44,300

LAKE DR/ FAU 9185

Over: FAI 255/HARDING DTCH

.3 MI E IL 111, St. Clair, IL

Built 1981 ADT: 44,300

FAI 255

Over: STATE ST

0.5 M S ST CLAIR AV, St. Clair, IL

Built 1982 ADT: 5,950

FAI 255

Over: SUMMIT AVE

0.3 MI N OF STATE ST, St. Clair, IL

Built 1982 ADT: 1,900

I-255 NB

Over: St. Clair Ave & Metrolin

0.50 mi N of State St, St. Clair, IL

Built 1982 ADT: 11,800

I-255 SB

Over: St. Clair Ave & Metrolin

0.50 mi N State St, St. Clair, IL

Built 1982 ADT: 11,800

FAI 255 NB

Over: FAI 64

.75 MI SO BUNKUM RD, St. Clair, IL

Built 1981 ADT: 16,500

FAI 255 SB

Over: FAI 64

.75 MI SO BUNKUM RD, St. Clair, IL

Built 1981 ADT: 91,400

BUNKUM RD/ FAU 916

Over: FAI 255

0.2MI N OF FAI 64, St. Clair, IL

Built 1985 ADT: 43,500

FOREST BLVD/FAU 91

Over: FAI 255/HARDING DITH

1.4MI N FAI 64, St. Clair, IL

Built 1985 ADT: 43,500

I-255 SB

Over: Black Lane, CSXRR, CSXRR

1.2 mi S of I-55/70, St. Clair, IL

Built 1985 ADT: 2,500

I-255 NB

Over: CSXRR, CSXRR, Black Lane

1.2 mi S of I-55/70, St. Clair, IL

Built 1985 ADT: 2,500

I-55/64EB mainlne"

Over: UPRR,IL 3 ramp,UPRR,UPRR

PIER BC1 TO ABUT C31, St. Clair, IL

Built 1967 ADT: 23,900

I-55/64WB mainlne"

Over: UPRR,IL 3 Ramp,UPRR,UPRR

PIER BC1-> ABUT B31, St. Clair, IL

Built 1967 ADT: 5,300

I-55/64 CD WB "G"

Over: Trendley Avenue

PIER G1 TO ABUT G14, St. Clair, IL

Built 1968 ADT: 275

IL15 Ramp G to SB2

Over: IL 163

0.2mi S of IL 15, St. Clair, IL

Built 1979 ADT: 2,150

81ST ST/CH35

Over: FAI 64/CD 360-361

1 MI WEST OF ILL 157, St. Clair, IL

Built 1969 ADT: 91,400

255NB Ramp E to IL

Over: IL 163

0.2mi S of IL 15, St. Clair, IL

Built 1980 ADT: 2,150

US 50

Over: CH 50/SUMERFIELD RD

.5M N OF SUMMERFIELD, St. Clair, IL

Built 1984 ADT: 375

Rieder Road TR 222

Over: FAI 64

1.64 MI E OF ILL 158, St. Clair, IL

Built 2017 ADT: 41,900

MLK RAMP 1 EB

Over: IL 3,TRRA,UPRR,MoAv,55-6

EAST APPROACH MLK, St. Clair, IL

Built 2000 ADT: 10

MLK RAMP 2 WB

Over: IL 3,TRRA,UPRR,MoAv,55-6

WEST APPROACH MLK, St. Clair, IL

Built 1999 ADT: 1,800

IL 161 NB

Over: DutchHollow,Metrolink,cr

2.2 mi SE of IL 157, St. Clair, IL

Built 1992 ADT: 475

IL 161 SB

Over: DutchHollow,Metrolink,cr

2.2mi SE of IL 157, St. Clair, IL

Built 1992 ADT: 475

ILL 15 (WB)

Over: STATE ST/FAU 9281

0.5M E OF IL 158, St. Clair, IL

Built 1995 ADT: 1,700

ILL 15 (EB)

Over: STATE ST/FAU 9281

0.5 M E IL 158, St. Clair, IL

Built 1995 ADT: 1,700

FAI 64 EB

Over: ILL 157

CASEYVILLE, St. Clair, IL

Built 2007 ADT: 11,600

FAI 64 WB

Over: ILL 157

CASEYVILLE, St. Clair, IL

Built 2007 ADT: 11,600

I-64 EB

Over: OLD COLLINSVILLE RD

1.01MI E IL 159, St. Clair, IL

Built 2007 ADT: 9,900

I-64 WB

Over: OLD COLLINSVILLE RD

1.02MI E OF ILL 159, St. Clair, IL

Built 2007 ADT: 9,900

RELOCATED I-70 EB

Over: 1ST STREET in E St L

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

Built 2013 ADT: 900

RELOCATED I-70 WB

Over: 1ST STREET in E ST L

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

Built 2013 ADT: 900

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