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:

IL 4

Over: TRIB TO MUD CREEK

3.5 M N JCT 13, St. Clair, IL

Built 1928 Load: 32.1 t ADT: 2,050

EB CD TO IL 3 SB "

Over: UPRR

PIER D11-> PIER O-17, St. Clair, IL

Built 1972 Load: 32.1 t ADT: 5,500

FAI 255-RAMP 9

Over: CANTEEN CREEK

I-255 SO OF CO LINE, St. Clair, IL

Built 1984 Load: 32.1 t ADT: 2,050

ILL 177

Over: SILVER CREEK

WCL MASCOUTAH, St. Clair, IL

Built 1961 Load: 32.4 t ADT: 7,000

ILL 159

Over: W FORK RICHLAND CRK

2 M S SMITHTON, St. Clair, IL

Built 1954 Load: 32.4 t ADT: 4,600

FAI 64 WB

Over: LITTLE SILVER CREEK

1.5 MI W OF ILL 4, St. Clair, IL

Built 1971 Load: 32.4 t ADT: 20,950

US 50

Over: SILVER CREEK BKWATER

1.3 MI W ILL 4, St. Clair, IL

Built 1939 Load: 32.4 t ADT: 16,000

FAU 9166 LINCOLN H

Over: OGLES CREEK

.14 E IL 159, St. Clair, IL

Built 1985 Load: 32.4 t ADT: 17,900

IL 4

Over: N1 TRIB L SILVER CRK

2 MI N OF US 50, St. Clair, IL

Built 1930 Load: 32.4 t ADT: 6,800

IL 15

Over: Abandoned RR,Salt Storag

2 mi NW of IL 159, St. Clair, IL

Built 1959 Load: 32.4 t ADT: 21,800

LAKE DRIVE

Over: DRAINGE TO FHSP LAKE

2.5 MI NW OF IL 157, St. Clair, IL

Built 1929 Load: 32.4 t ADT: 2,750

SCOTT TROY FAU 917

Over: HAGEMANN CREEK

2.9 MI N U.S. RTE 50, St. Clair, IL

Built 1976 Load: 32.4 t ADT: 7,500

TOWN HALL ROAD CH

Over: RAYHILL SLOUGH

2.0 MI E OF ILL RTE4, St. Clair, IL

Built 1979 Load: 32.4 t ADT: 350

FAU 9167 SULLIVAN

Over: METRO LINK

0.2M N ILL 161, St. Clair, IL

Built 1980 Load: 32.4 t ADT: 8,250

BOHLEYSVILLE RD CH

Over: PRAIRIE DULONG CR

4.6 MI S MILLSTADT, St. Clair, IL

Built 1981 Load: 32.4 t ADT: 350

CEMETERY RD FAS 84

Over: JACKS RUN CREEK

0.5 MI E FREEBURG, St. Clair, IL

Built 1983 Load: 32.4 t ADT: 1,050

FAU 9175

Over: OGLE CREEK

0.5M S MADISON C LN, St. Clair, IL

Built 1983 Load: 32.4 t ADT: 8,100

SAXTOWN RD/ CH 71

Over: WEST FORK CREEK

2.5 MI S MILLSTADT, St. Clair, IL

Built 1985 Load: 32.4 t ADT: 750

RISDON SCHL/ FAS 8

Over: DOZA CREEK

3.0 MI SW MARISSA, St. Clair, IL

Built 1986 Load: 32.4 t ADT: 325

RISDON SCHL/ FAS 8

Over: BRANCH OF DOZA CREEK

0.5 MI SW MARISSA, St. Clair, IL

Built 1986 Load: 32.4 t ADT: 325

FIVE FORKSE.RD/CH

Over: SILVER CR

4 M SSE FREEBURG, St. Clair, IL

Built 1987 Load: 32.4 t ADT: 350

FAU 9212

Over: MO. PAC. R.R.

PARKS AIRPORT CAHOKI, St. Clair, IL

Built 1980 Load: 32.4 t ADT: 6,450

FAU 9241

Over: HARDIN DITCH

100'S ST. CLAIR AVE, St. Clair, IL

Built 1991 Load: 32.4 t ADT: 2,850

HARTMAN LN/ FAU 91

Over: RICHLAND CREEK

2.25 MI S LINCOLN TR, St. Clair, IL

Built 1992 Load: 32.4 t ADT: 10,000

ROBINSON SCH RD/CH

Over: RICHLAND CREEK

1.5 MI E IL 159, St. Clair, IL

Built 1993 Load: 32.4 t ADT: 400

WATERLOO RD/ FAS 8

Over: PRAIRIE DULONG CREEK

.8 MI W FLORAVILLE, St. Clair, IL

Built 1994 Load: 32.4 t ADT: 1,600

WINTER RD CH 49

Over: DOZA CREEK NORTH

2.25 MI S IL 13, St. Clair, IL

Built 1993 Load: 32.4 t ADT: 175

DOUGLAS-MILLSTADT

Over: DOUGLAS CREEK

0.5 MI W IL 159, St. Clair, IL

Built 1996 Load: 32.4 t ADT: 3,200

DOUGLAS FREEBURG R

Over: RICHLAND CREEK

1 MI E OF IL 159, St. Clair, IL

Built 2006 Load: 32.4 t ADT: 3,950

KARCH RD/TR 201

Over: DRUM HILL BRANCH

1.8 ME ILL 15, St. Clair, IL

Built 1981 Load: 32.4 t ADT: 325

CLOVER LEAF/ TR 10

Over: PRAIRIE DUPONT CREEK

2.0 MI E ILL 163, St. Clair, IL

Built 1982 Load: 32.4 t ADT: 125

VILLA DR/FAU 9258

Over: PR DUPONT CREEK

3.3 MI W 59 ST, St. Clair, IL

Built 1983 Load: 32.4 t ADT: 250

LEBANON TROY TR 5

Over: SILVER CR

0.25 MI W RICHWOOD R, St. Clair, IL

Built 1986 Load: 32.4 t ADT: 300

RIESS ROADTR 129

Over: RAYHILL SLOUGH

0.1 MI E WOODLAND RD, St. Clair, IL

Built 1987 Load: 32.4 t ADT: 50

MILBURN SCH RD/TR

Over: OGLE CREEK

1.25 N I64/50 INTCHG, St. Clair, IL

Built 1990 Load: 32.4 t ADT: 6,550

DOZA CREEK RD

Over: DOZA CREEK

0.25M S OF CH24, St. Clair, IL

Built 1996 Load: 32.4 t ADT: 375

TR-186 Risdon Sch

Over: Doza Creek

1.5MI WEST OF CH 27, St. Clair, IL

Built 1998 Load: 32.4 t ADT: 75

BOWLER RD

Over: OGLES CREEK

.25MI N OF CH45, St. Clair, IL

Built 1998 Load: 32.4 t ADT: 275

ILL 15

Over: HARDING DITCH

0.3 M W JCT 157, St. Clair, IL

Built 1940 Load: 32.7 t ADT: 30,000

IL 161

Over: NSRR

0.6 mi E of IL 159, St. Clair, IL

Built 1990 Load: 32.7 t ADT: 19,600

GRAY PLAZA

Over: TRIBUTARY SILVER CREEK

130' N OF AIR GUARD WAY, St. Clair, IL

Built 1970 Load: 32.7 t ADT: 20

ILL 158

Over: LOOP CREEK

0.3 M N JCT ILL 177, St. Clair, IL

Built 1923 Load: 33.0 t ADT: 5,350

FAU 9206-WATER ST

Over: Prairie duPont Canal

1.5M S ILL 157, St. Clair, IL

Built 1984 Load: 33.4 t ADT: 1,350

EMERALD MOUND TR 2

Over: LITTLE SILVER CR

1.25 MI NE ILL 4, St. Clair, IL

Built 1964 Load: 33.7 t ADT: 25

IL 203

Over: DRNG TO CAHOKIA CNL

0.1 M N OLD US 40, St. Clair, IL

Built 1960 Load: 34.0 t ADT: 3,500

ILL 177

Over: Reinhardt SLOUGH

1.4M E OF JCT IL 4, St. Clair, IL

Built 1994 Load: 34.0 t ADT: 2,450

SCOTT-TROY/ FAU 91

Over: ENGLE CREEK

1.65MI N U.S.RTE 50, St. Clair, IL

Built 1973 Load: 34.0 t ADT: 9,250

FAI 64 WB

Over: SILVER CREEK

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

Built 1971 Load: 34.3 t ADT: 20,950

FAI 64 EB

Over: LITTLE SILVER CREEK

1.5 MI W OF ILL 4, St. Clair, IL

Built 1971 Load: 34.3 t ADT: 20,950

SBI-4

Over: CAHOKIA CANAL

E ILL 203 S BEND RD, St. Clair, IL

Built 1923 Load: 34.7 t 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 6, 2026