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 255 N

Over: RP IS270W TO IS55N

S 34 T 43 N R 6 E, St. Louis, MO

Built 1964 ADT: 12,696

IS 255 S

Over: IS 55

S 34 T 43 N R 6 E, St. Louis, MO

Built 1964 ADT: 62,787

RP IS270W TO IS55N

Over: IS 55

S 34 T 43 N R 6 E, St. Louis, MO

Built 1964 ADT: 76,905

RP IS44E TO IS270E

Over: MO 366

S 14 T 55 N R 5 E, St. Louis, MO

Built 1996 ADT: 9,784

MO 364 E

Over: IS 270

S 1312 T 46 N R 5 E, St. Louis, MO

Built 1966 ADT: 87,171

MO 364 W

Over: IS 270

S 1312 T 46 N R 5 E, St. Louis, MO

Built 1966 ADT: 68,802

US 50 E

Over: IS 255

S 35 T 44 N R 6 E, St. Louis, MO

Built 1969 ADT: 51,346

GEYER RD S

Over: IS 44

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

Built 1996 ADT: 44,242

BOONES CROSSING RD

Over: IS 64

S 125 T 45 N R 4 E, St. Louis, MO

Built 1999 ADT: 53,025

BIG BEND RD E

Over: MO 141

S 7 T 44 N R 5 E, St. Louis, MO

Built 2000 ADT: 25,147

CRESCENT AVE E

Over: MO 141

S 7 T 44 N R 5 E, St. Louis, MO

Built 2000 ADT: 25,147

IS 70 E

Over: CST AIRFLIGHT DR

S 168 T 46 N R 6 E, St. Louis, MO

Built 2000 ADT: 10,084

IS 70 E

Over: CST CYPRESS RD

S 24 T 46 N R 6 E, St. Louis, MO

Built 2000 ADT: 5,050

IS 70 E

Over: CST SPRINGDALE AVE

S 15 T 46 N R 6 E, St. Louis, MO

Built 2000 ADT: 1,984

IS 70 W

Over: CST SPRINGDALE AVE

S 15 T 46 N R 6 E, St. Louis, MO

Built 2000 ADT: 1,984

IS 70 E

Over: CST JENNINGS STATION RD

S 19 T 46 N R 7 E, St. Louis, MO

Built 2001 ADT: 17,056

RT U S

Over: IS 70

S 24 T 46 N R 6 E, St. Louis, MO

Built 2001 ADT: 64,386

MO 100 W

Over: RP IS270W TO MO100E

S 34 T 45 N R 5 E, St. Louis, MO

Built 1999 ADT: 6,504

IS 70 E

Over: RT N

S 14 T 46 N R 6 E, St. Louis, MO

Built 2001 ADT: 7,316

IS 70 W

Over: RT N

S 14 T 46 N R 6 E, St. Louis, MO

Built 2001 ADT: 7,316

BERMUDA DR S

Over: IS 70

S 24 T 46 N R 6 E, St. Louis, MO

Built 2001 ADT: 75,759

SEVEN PINES DR S

Over: MO 364

S 29 T 46 N R 5 E, St. Louis, MO

Built 1999 ADT: 29,109

AMIOT DR E

Over: MO 364

S 29 T 46 N R 5 E, St. Louis, MO

Built 1999 ADT: 29,109

RP N HANLEY RD TO

Over: RP IS70E TO RTNN

S 14 T 46 N R 6 E, St. Louis, MO

Built 2001 ADT: 5,462

NORTH HANLEY RD S

Over: IS 70

S 3082 T 46 N R 6 E, St. Louis, MO

Built 2001 ADT: 58,687

RIVER VALLEY DR S

Over: MO 364

S 24 T 46 N R 4 E, St. Louis, MO

Built 2001 ADT: 31,204

MO 364 E

Over: CST CREVE COEUR MILL RD

S 3094 T 46 N R 5 E, St. Louis, MO

Built 2001 ADT: 2,634

MO 364 W

Over: CST CREVE COEUR MILL RD

S 3094 T 46 N R 5 E, St. Louis, MO

Built 2001 ADT: 2,634

MO 364 E

Over: RP MO364E TO MO141N

S 19 T 46 N R 5 E, St. Louis, MO

Built 2001 ADT: 11,161

MO 364 W

Over: RP MO364E TO MO141N

S 19 T 46 N R 5 E, St. Louis, MO

Built 2001 ADT: 11,161

RP BERMUDA RD TO I

Over: RT N

S 14 T 46 N R 6 E, St. Louis, MO

Built 2001 ADT: 7,316

IS 270 E

Over: CST WEST PORT PLAZA DR

S 1312 T 46 N R 5 E, St. Louis, MO

Built 1965 ADT: 10,666

IS 64 E

Over: MO 340

S 415 T 45 N R 4 E, St. Louis, MO

Built 1968 ADT: 11,321

IS 64 W

Over: MO 340

S 415 T 45 N R 4 E, St. Louis, MO

Built 1968 ADT: 10,727

IS 44 E

Over: US 50

S 12 T 44 N R 5 E, St. Louis, MO

Built 1967 ADT: 14,603

IS 44 W

Over: US 50

S 12 T 44 N R 5 E, St. Louis, MO

Built 1967 ADT: 14,603

HOLMES AVE S

Over: IS 44

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

Built 1967 ADT: 53,144

SAPPINGTON RD S

Over: IS 44

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

Built 1969 ADT: 54,997

IS 44 E

Over: CST BERRY RD

S 5 T 44 N R 6 E, St. Louis, MO

Built 1969 ADT: 4,625

IS 44 W

Over: CST BERRY RD

S 5 T 44 N R 6 E, St. Louis, MO

Built 1969 ADT: 4,625

SO ROCK HILL RD S

Over: IS 44

S 5 T 44 N R 6 E, St. Louis, MO

Built 1969 ADT: 51,725

IS 44 E

Over: CST ELM AVE

S 4 T 44 N R 6 E, St. Louis, MO

Built 1969 ADT: 22,293

IS 44 W

Over: CST ELM AVE

S 4 T 44 N R 6 E, St. Louis, MO

Built 1969 ADT: 22,293

EDGAR RD S

Over: IS 44

S 4 T 44 N R 6 E, St. Louis, MO

Built 1969 ADT: 53,064

MURDOCH AVE E

Over: IS 44

S 34 T 45 N R 6 E, St. Louis, MO

Built 1969 ADT: 37,000

IS 44 E

Over: CST LACLEDE STATION RD

S 34 T 45 N R 6 E, St. Louis, MO

Built 1969 ADT: 22,587

IS 44 W

Over: CST LACLEDE STATION RD

S 34 T 45 N R 6 E, St. Louis, MO

Built 1969 ADT: 22,587

SHREWSBURY AVE S

Over: RP IS44W TO SHREWSBURY A

S 34 T 45 N R 6 E, St. Louis, MO

Built 1969 ADT: 4,154

LEWIS RD S

Over: IS 44

S 33 T 44 N R 4 E, St. Louis, MO

Built 1968 ADT: 27,863

IS 270 W

Over: MO 180

S 131 T 47 N R 5 E, St. Louis, MO

Built 1960 ADT: 27,415

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