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)

ILL 157

Good

Over: CANTEEN CREEK

N C LMTS CASEYVILLE, St. Clair, IL

Built 1990 Load: 37.9 t ADT: 11,300

DAVIS ST/ FAU 9301

Good

Over: FISH LAKE

1.25MI W ILL RTE 3, St. Clair, IL

Built 1974 Load: 37.9 t ADT: 400

ILL 159

Good

Over: BR RICHLAND CREEK

under IL 15 bridges, St. Clair, IL

Built 1967 Load: 38.6 t ADT: 14,200

I-70 WB

Good

Over: KCSRR, CSXRR

QuadLevel 55/70WB to 70WB, St. Clair, IL

Built 2014 Load: 38.9 t ADT: 21,000

ILL 13

Good

Over: POWDER MILL CREEK

1 M E CENTREVILLE, St. Clair, IL

Built 1929 Load: 39.5 t ADT: 3,250

IL 4

Good

Over: MUD CREEK OVERFLOW

0.56 MI N MARISSA, St. Clair, IL

Built 1992 Load: 39.5 t ADT: 1,550

IL 4

Good

Over: N Trib to Silver Crk

N Leg of IL 4/IL 161, St. Clair, IL

Built 1995 Load: 39.5 t ADT: 7,800

ILL 13 / IL 157

Good

Over: HARDING DITCH

SE OF JCT IL 163&157, St. Clair, IL

Built 1973 Load: 39.9 t ADT: 6,000

ILL 161

Good

Over: TRIB TO LOOP CREEK

1.22 M W OF ILL 158, St. Clair, IL

Built 1933 Load: 39.9 t ADT: 14,400

BUNKUM RD/FAU 9160

Good

Over: HARDING DITCH

1 MI E IL 111, St. Clair, IL

Built 2008 Load: 40.5 t ADT: 1,500

IL 158

Good

Over: BR of Richland Creek

300 feet S of IL 15, St. Clair, IL

Built 2013 Load: 40.8 t ADT: 9,050

NORTH GREENMOUNT R

Good

Over: RICHLAND CREEK

1.5 MI N SHILOH RD, St. Clair, IL

Built 1987 Load: 40.8 t ADT: 19,200

ILL 159

Good

Over: RICHLAND CREEK

IN BELLEVILLE, St. Clair, IL

Built 1923 Load: 41.1 t ADT: 11,400

IL 161

Good

Over: Schoenberger Creek

300' NW DUTCH HOLLOW, St. Clair, IL

Built 1993 Load: 41.1 t ADT: 15,100

IL 159

Good

Over: Br of Canteen Creek

500' s of madison co, St. Clair, IL

Built 2012 Load: 41.1 t ADT: 16,100

IL 4

Good

Over: MUD CREEK

1.2 MI N JCT IL 13, St. Clair, IL

Built 1992 Load: 41.5 t ADT: 1,550

OLD IL 3 - FAU 929

Good

Over: HILL CREEK

1.1M S DUPO, St. Clair, IL

Built 1997 Load: 41.5 t ADT: 2,600

ILL 15 WB

Good

Over: RICHLAND CREEK

1.0 M E JCT ILL 159, St. Clair, IL

Built 1956 Load: 41.8 t ADT: 12,500

TR 120 Mulligan Ln

Good

Over: Br of Richland Cr

1.14 Mi W of IL 159, St. Clair, IL

Built 2020 Load: 41.8 t ADT: 125

Bond Ave

Good

Over: A&SRR

39TH & BOND ALORTON, St. Clair, IL

Built 1980 Load: 42.4 t ADT: 3,250

1L 15

Good

Over: SILVER CREEK

2.5 MI E FREEBURG, St. Clair, IL

Built 1993 Load: 42.4 t ADT: 2,600

IL 13 EB TO IL 15

Good

Over: TRIB TO RICHLAND CRK

1.6 M SE IL 158& 177, St. Clair, IL

Built 2006 Load: 42.4 t ADT: 450

Rel. IL 3 (Packers

Good

Over: KCSRR, Water St, UPRR

0.6 mi W. of I-70, St. Clair, IL

Built 2016 Load: 42.8 t ADT: 2,350

FAI 255 SB

Good

Over: HARDING DITCH north

1.9MI N FAI 64, St. Clair, IL

Built 1985 Load: 43.4 t ADT: 21,750

IL 177

Good

Over: LOOP CREEK

3MI WEST OF 158, St. Clair, IL

Built 2007 Load: 43.4 t ADT: 7,800

IL 13

Good

Over: E Trib to Doza Creek

0.9MI NW MARISSA, St. Clair, IL

Built 2014 Load: 44.1 t ADT: 3,350

FAU 9181 SUMMIT AV

Good

Over: HARDING DITCH

0.7 M E JCT ILL 111, St. Clair, IL

Built 1957 Load: 44.7 t ADT: 1,900

Rel. IL 3 (Packers

Good

Over: KCSRR, Water St, UPRR

0.6 mi W. of I-70, St. Clair, IL

Built 2016 Load: 45.7 t ADT: 2,350

IL 3

Good

Over: UPRR, Prarie duPont Cana

NORTH OF DUPO, St. Clair, IL

Built 2012 Load: 46.0 t ADT: 9,600

IL 161

Good

Over: Metrolink

0.1mi W of IL 159, St. Clair, IL

Built 1935 Load: 46.3 t ADT: 14,700

IL 161 NORTHBOUND

Good

Over: SCHOENBERGER CREEK

1MI SO. ST CLAIR AVE, St. Clair, IL

Built 2007 Load: 46.7 t ADT: 14,800

IL 161 SOUTHBOUND

Good

Over: SCHOENBERGER CREEK

IMI SO. ST CLAIR AVE, St. Clair, IL

Built 2007 Load: 46.7 t ADT: 14,800

FAI 255

Good

Over: HILL CREEK

1.5 MI S OF DUPO, St. Clair, IL

Built 1979 Load: 46.7 t ADT: 41,000

MSS 6035

Good

Over: HILL CREEK

1.5 M SO OF DUPO, St. Clair, IL

Built 1979 Load: 46.7 t ADT: 125

TR 194 Reinneck Rd

Good

Over: Hazel Creek

0.25 Mi N Jefferson, St. Clair, IL

Built 2018 Load: 47.3 t ADT: 225

FAI 255 NB

Good

Over: CANTEEN CREEK

0.1MI S MAD CO LINE, St. Clair, IL

Built 1984 Load: 48.0 t ADT: 21,750

IL 4

Good

Over: S1 Trib L Silver Crk

1.1 mi S of US 50, St. Clair, IL

Built 1998 Load: 48.0 t ADT: 6,050

TR-237 (Probst Roa

Good

Over: Trib to Richland Cr

0.5 Mi E. of Ill 159, St. Clair, IL

Built 2017 Load: 48.0 t ADT: 75

IL 157

Good

Over: CSXRR

Caseyville N C.L., St. Clair, IL

Built 1990 Load: 48.3 t ADT: 11,300

IL 159

Good

Over: CSXRR & Canteen Creek

Collinsville S C.L., St. Clair, IL

Built 1980 Load: 48.6 t ADT: 16,300

IL 177

Good

Over: LOOP CREEK

1 MI W. JCT W/158, St. Clair, IL

Built 2007 Load: 49.2 t ADT: 5,600

ILL 161

Good

Over: ASH CREEK

2.7MI W ILL 4, St. Clair, IL

Built 1932 Load: 49.6 t ADT: 5,900

IL 15 EB

Good

Over: ICRR

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

Built 2015 Load: 49.9 t ADT: 12,500

Lebanon Rd /FAU 91

Good

Over: SCHOENBERGER CREEK

0.1 M W ILL 161, St. Clair, IL

Built 1978 Load: 49.9 t ADT: 3,100

IL 15 WB

Good

Over: ICRR

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

Built 2015 Load: 50.2 t ADT: 12,500

IL 156

Good

Over: RICHLAND CREEK

1.2 MI E. JCT 159, St. Clair, IL

Built 2007 Load: 50.5 t ADT: 2,750

IL 163

Good

Over: S PRAIRIE duPONT CK

2MI N OF MILSTADT, St. Clair, IL

Built 2006 Load: 50.9 t ADT: 3,500

IL 4

Good

Over: LITTLE MUD CREEK

0.3 M SOUTH IL 15, St. Clair, IL

Built 1994 Load: 51.5 t ADT: 2,400

IL 4

Good

Over: LITTLE MUD CREEK

.8 M N JCT DRMSDT RD, St. Clair, IL

Built 2012 Load: 51.5 t ADT: 2,400

FAI 64

Good

Over: Brooms Run

0.63 E ILL 4, St. Clair, IL

Built 1972 Load: 52.5 t ADT: 34,900

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