St. Louis County, MO

912 public highway bridges

St. Louis County Bridge Snapshot

St. Louis County, Missouri contains 912 public highway bridges in the FHWA National Bridge Inventory. Roughly 21.5% are rated “Good,” 42.2% “Fair,” 3.9% “Poor,” and 3.9% 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 MO 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.

912

Total Bridges

21.5%

Good

3.9%

Poor

3.9%

Structurally Deficient

Condition Distribution

Good

21.5% (196)

Fair

42.2% (385)

Poor

3.9% (36)

SD

3.9% (36)

All Bridges (912)

Sort:

IS 44 E

Over: CST YARNELL RD

S 14 T 44 N R 5 E, St. Louis, MO

Built 2018 ADT: 9,738

MO 366 E

Over: RP IS270E TO IS44E

S 14 T 44 N R 5 E, St. Louis, MO

Built 2018 ADT: 15,559

MO 366 W

Over: RP IS270E TO IS44E

S 14 T 44 N R 5 E, St. Louis, MO

Built 2018 ADT: 15,559

CLAYTON RD E

Over: IS 270

S 22 T 45 N R 5 E, St. Louis, MO

Built 1985 ADT: 98,949

DORSETT RD E

Over: US 67

S 24 T 46 N R 5 E, St. Louis, MO

Built 2019 ADT: 9,889

ELIZABETH AVE S

Over: IS 270

S 31 T 47 N R 7 E, St. Louis, MO

Built 2020 ADT: 63,133

CO SOR270E TO NOR2

Over: IS 270

S 31 T 47 N R 7 E, St. Louis, MO

Built 2020 ADT: 61,856

US 67 N

Over: OR 270

S 33 T 47 N R 6 W, St. Louis, MO

Built 2020 ADT: 3,846

US 67 N

Over: IS 270

S 33 T 47 N R 6 E, St. Louis, MO

Built 2020 ADT: 53,874

OR 270 E

Over: IS 270

S 32 T 47 N R 7 E, St. Louis, MO

Built 2020 ADT: 47,337

US 67 S

Over: IS 270

S 33 T 47 N R 6 E, St. Louis, MO

Built 2020 ADT: 66,676

WEST FLORISSANT AV

Over: IS 270

S 31 T 47 N R 7 E, St. Louis, MO

Built 2020 ADT: 56,335

IS 55 S

Over: CRD REAVIS BARRACKS RD

S 23 T 44 N R 7 E, St. Louis, MO

Built 1962 ADT: 24,517

IS 55 S

Over: CRD BAYLESS AVE

S 18 T 44 N R 7 E, St. Louis, MO

Built 1962 ADT: 11,683

BIG BEND RD E

Over: IS 44

S 7 T 44 N R 6 E, St. Louis, MO

Built 2022 ADT: 43,460

IS 270 E

Over: RT N

S 35 T 47 N R 6 E, St. Louis, MO

Built 2022 ADT: 16,977

IS 270 W

Over: RT AC

S 31 T 47 N R 7 W, St. Louis, MO

Built 2022 ADT: 19,279

IS 270 E

Over: RT AC

S 31 T 47 N R 7 E, St. Louis, MO

Built 2022 ADT: 15,413

RP IS270E TO MO367

Over: MO 367

S 33 T 47 N R 7 E, St. Louis, MO

Built 2022 ADT: 8,801

RP IS270E TO MO367

Over: IS 270

S 33 T 47 N R 7 E, St. Louis, MO

Built 2022 ADT: 39,031

US 67 S

Over: CST LYNN HAVEN LN

S 939 T 47 N R 6 E, St. Louis, MO

Built 1989 ADT: 2,924

RP IS64E TO IS270E

Over: CST CONWAY RD

S 15 T 45 N R 5 E, St. Louis, MO

Built 2023 ADT: 6,789

IS 270 E

Over: CST CONWAY RD

S 15 T 45 N R 5 E, St. Louis, MO

Built 2023 ADT: 2,844

IS 270 W

Over: CST CONWAY RD

S 15 T 45 N R 5 E, St. Louis, MO

Built 2023 ADT: 6,789

MO 367 N

Over: US 67

S 16 T 47 N R 7 E, St. Louis, MO

Built 1988 ADT: 14,257

MO 370 W

Over: CST MAIN ST

S 32 T 47 N R 5 E, St. Louis, MO

Built 1993 ADT: 234

IS 64 E

Over: RT JJ

S 15 T 45 N R 5 E, St. Louis, MO

Built 1991 ADT: 18,444

IS 64 W

Over: RT JJ

S 15 T 45 N R 5 E, St. Louis, MO

Built 1991 ADT: 18,444

RP IS270E TO IS64E

Over: RT JJ

S 15 T 45 N R 5 E, St. Louis, MO

Built 1990 ADT: 18,444

IS 64 W

Over: IS 270

S 15 T 45 N R 5 E, St. Louis, MO

Built 1988 ADT: 97,404

RP IS64W TO IS270W

Over: RP IS270W TO IS64E

S 15 T 45 N R 5 E, St. Louis, MO

Built 1988 ADT: 21,946

IS 64 E

Over: IS 270

S 15 T 45 N R 5 E, St. Louis, MO

Built 1988 ADT: 98,949

RP IS64E TO IS270E

Over: RP IS270E TO IS64W

S 15 T 45 N R 5 E, St. Louis, MO

Built 1988 ADT: 18,296

RP IS64E TO RTJJ S

Over: RP IS270E TO IS64E

S 15 T 45 N R 5 E, St. Louis, MO

Built 1991 ADT: 14,766

IS 270 E

Over: RP IS270W TO IS64E

S 15 T 45 N R 5 E, St. Louis, MO

Built 1993 ADT: 21,946

MO 340 E

Over: CST CHESTERFIELD PKWY EA

S 2002 T 45 N R 4 E, St. Louis, MO

Built 1990 ADT: 11,574

MO 340 W

Over: CST CHESTERFIELD PKWY EA

S 2002 T 45 N R 4 E, St. Louis, MO

Built 1990 ADT: 11,574

CHESTERFIELD PKWY

Over: IS 64

S 10 T 45 N R 4 E, St. Louis, MO

Built 1990 ADT: 69,731

TIMBERLAKE MANOR D

Over: IS 64

S 11 T 45 N R 4 E, St. Louis, MO

Built 1990 ADT: 69,731

S WOODS MILL RD S

Over: IS 64

S 13 T 45 N R 4 E, St. Louis, MO

Built 1988 ADT: 69,731

THEISS RD S

Over: IS 270

S 1988 T 44 N R 6 E, St. Louis, MO

Built 1993 ADT: 77,318

JJ KELLEY MEMORIAL

Over: IS 270

S 27 T 45 N R 5 E, St. Louis, MO

Built 1989 ADT: 98,949

RP IS270W TO IS55N

Over: CRD VON TALGE RD

S 33 T 44 N R 6 E, St. Louis, MO

Built 1993 ADT: 3,107

RP IS55N TO IS270E

Over: CRD VON TALGE RD

S 33 T 44 N R 6 E, St. Louis, MO

Built 1993 ADT: 3,107

RP IS55N TO IS270E

Over: IS 255

S 34 T 44 N R 6 E, St. Louis, MO

Built 1991 ADT: 35,885

RP IS55S TO IS255S

Over: RP IS270W TO IS55N

S 34 T 44 N R 6 E, St. Louis, MO

Built 1991 ADT: 13,579

MO 370 E

Over: RP IS270E TO MO370W

S 2038 T 47 N R 5 E, St. Louis, MO

Built 1991 ADT: 6,769

MO 370 E

Over: CST MISSOURI BOTTOM RD

S 2038 T 47 N R 5 E, St. Louis, MO

Built 1990 ADT: 13,069

MO 370 E

Over: CST FERGUSON LN

S 2038 T 47 N R 5 E, St. Louis, MO

Built 1990 ADT: 400

MO 370 W

Over: CST FERGUSON LN

S 2038 T 47 N R 5 E, St. Louis, MO

Built 1990 ADT: 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 6, 2026