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 64 E

Over: US 61

S 2675 T 45 N R 5 E, St. Louis, MO

Built 2008 ADT: 12,488

HIGHLAND TER N

Over: IS 64

S 23 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 73,001

RP IS170E TO IS64W

Over: RP IS170E TO BRENTWOOD B

S 16 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 327

RP IS64E TO IS170W

Over: IS 64

S 21 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 61,811

RP IS170E TO IS64E

Over: IS 170

S 21 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 39,052

SPOEDE RD S

Over: IS 64

S 13 T 45 N R 5 E, St. Louis, MO

Built 2008 ADT: 72,743

IS 64 E

Over: CST LACLEDE STATION RD

S 22 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 2,216

BIG BEND BLVD E

Over: IS 64

S 23 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 78,973

MC CUTCHEON RD S

Over: IS 64

S 20 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 61,811

IS 64 E

Over: CST CLAYTON RD

S 18 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 8,747

RP IS170E TO IS64W

Over: CST S BRENTWOOD BLVD

S 16 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 22,282

HANLEY RD S

Over: IS 64

S 22 T 45 N R 20 W, St. Louis, MO

Built 2008 ADT: 79,962

RP BRENTWOOD BLVD

Over: IS 170

S 21 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 39,052

RP HANLEY DR TO IS

Over: IS 170

S 21 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 39,052

IS 64 E

Over: IS 170

S 21 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 35,480

IS 64 E

Over: CST CLAYTONIA TER

S 22 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 948

IS 64 E

Over: CST S BRENTWOOD BLVD

S 21 T 45 N R 6 E, St. Louis, MO

Built 2008 ADT: 24,450

UNION RD E

Over: IS 55

S 24 T 44 N R 6 E, St. Louis, MO

Built 2009 ADT: 64,213

IS 270 E

Over: CST DORSETT RD

S 22 T 46 N R 5 E, St. Louis, MO

Built 2009 ADT: 15,043

PVT MARITZ ENT S

Over: IS 44

S 1983 T 44 N R 5 E, St. Louis, MO

Built 1983 ADT: 46,465

RT AB E

Over: MO 141

S 109 T 45 N R 5 E, St. Louis, MO

Built 2011 ADT: 15,992

RT AB E

Over: CST N WOODS MILL RD

S 109 T 45 N R 5 E, St. Louis, MO

Built 2012 ADT: 4,962

MO 340 E

Over: MO 141

S 367 T 46 N R 5 E, St. Louis, MO

Built 2011 ADT: 6,393

RP IS270E TO MO364

Over: IS 270

S 28 T 46 N R 5 E, St. Louis, MO

Built 2010 ADT: 68,802

RP IS270E TO MO364

Over: MO 364

S 28 T 46 N R 5 E, St. Louis, MO

Built 2010 ADT: 24,866

CLAYTON RD E

Over: MO 141

S 24 T 45 N R 4 E, St. Louis, MO

Built 1987 ADT: 18,076

RP MO141S TO CLAYT

Over: OR 141

S 24 T 45 N R 4 E, St. Louis, MO

Built 1989 ADT: 4,434

IS 64 W

Over: MO 141

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

Built 1985 ADT: 31,882

OR 64 E

Over: MO 141

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

Built 1985 ADT: 31,882

DELMAR BLVD E

Over: IS 170

S 4 T 45 N R 6 E, St. Louis, MO

Built 2011 ADT: 47,949

MO 141 N

Over: OR 44

S 19 T 44 N R 5 E, St. Louis, MO

Built 1984 ADT: 984

MO 141 S

Over: OR 44

S 19 T 44 N R 5 E, St. Louis, MO

Built 1984 ADT: 984

MO 141 S

Over: CST WATER WORKS DR

S 433 T 46 N R 5 E, St. Louis, MO

Built 2012 ADT: 6,002

RP CHESTERFIELD AI

Over: IS 64

S 371 T 45 N R 3 E, St. Louis, MO

Built 2013 ADT: 37,898

JAMES S MCDONNELL

Over: IS 70

S 656 T 46 N R 6 E, St. Louis, MO

Built 1984 ADT: 69,537

CHESTERFIELD PKWY

Over: IS 64

S 123 T 45 N R 4 E, St. Louis, MO

Built 2013 ADT: 50,214

MISSOURI BOTTOM RD

Over: IS 270

S 2093 T 47 N R 5 E, St. Louis, MO

Built 1990 ADT: 64,017

RP LAMBERT INTL BL

Over: IS 70

S 656 T 46 N R 6 E, St. Louis, MO

Built 1984 ADT: 69,537

IS 44 E

Over: MO 109

S 2071 T 44 N R 4 E, St. Louis, MO

Built 1986 ADT: 12,280

MO 109 S

Over: CST E FIRST ST

S 2071 T 44 N R 4 E, St. Louis, MO

Built 1987 ADT: 400

CENTRAL AVE S

Over: IS 44

S 2071 T 44 N R 3 E, St. Louis, MO

Built 1989 ADT: 29,631

WOODFORD WAY S

Over: IS 270

S 2083 T 46 N R 5 E, St. Louis, MO

Built 1988 ADT: 58,349

GIST RD E

Over: IS 270

S 130 T 46 N R 5 E, St. Louis, MO

Built 1988 ADT: 58,349

RP MO141N TO IS44W

Over: MO 141

S 1983 T 44 N R 5 E, St. Louis, MO

Built 2016 ADT: 30,753

RP MO141S TO IS44E

Over: RP OR44W TO MO141S

S 1983 T 44 N R 5 E, St. Louis, MO

Built 2016 ADT: 12,218

MASON RD S

Over: IS 64

S 17 T 45 N R 5 E, St. Louis, MO

Built 1987 ADT: 76,943

RP IS64W TO MO141S

Over: MO 141

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

Built 1985 ADT: 24,333

IS 64 E

Over: MO 141

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

Built 1985 ADT: 31,882

MARYVILLE CENTRE D

Over: IS 64

S 18 T 45 N R 5 E, St. Louis, MO

Built 1985 ADT: 70,697

IS 44 W

Over: CST YARNELL RD

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

Built 2018 ADT: 12,631

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