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: LP 44

S 34 T 44 N R 3 E, St. Louis, MO

Built 2002 ADT: 7,908

IS 44 W

Over: LP 44

S 34 T 44 N R 3 E, St. Louis, MO

Built 2002 ADT: 7,908

MO 340 E

Over: IS 270

S 3 T 45 N R 5 E, St. Louis, MO

Built 2002 ADT: 93,142

MO 340 E

Over: CST WOODCREST EXECUTIVE

S 3 T 45 N R 5 E, St. Louis, MO

Built 2002 ADT: 702

JAMES S MCDONNELL

Over: IS 270

S 278 T 47 N R 3 E, St. Louis, MO

Built 2002 ADT: 63,110

IS 170 W

Over: OR 270

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

Built 2002 ADT: 7,910

RP IS270W TO IS170

Over: OR 270

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

Built 2002 ADT: 7,910

RP IS170W TO IS270

Over: OR 270

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

Built 2002 ADT: 3,955

RP IS170W TO IS270

Over: RP IS270E TO NORTH HANLE

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

Built 2002 ADT: 5,324

IS 270 E

Over: CST NORTH HANLEY RD

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

Built 2002 ADT: 28,443

IS 270 W

Over: CST NORTH HANLEY RD

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

Built 2002 ADT: 28,443

MO 340 E

Over: US 67

S 1 T 45 N R 5 E, St. Louis, MO

Built 2003 ADT: 12,433

ST LOUIS MILLS BLV

Over: MO 370

S 26 T 47 N R 5 E, St. Louis, MO

Built 2003 ADT: 22,847

US 61 S

Over: IS 255

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

Built 2004 ADT: 35,885

WEST PORT PLAZA DR

Over: RT D

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

Built 1978 ADT: 16,360

LACKLAND RD E

Over: IS 170

S 28 T 46 N R 6 E, St. Louis, MO

Built 1981 ADT: 27,139

CO SOR44E TO FENTO

Over: OR 44

S 22 T 44 N R 5 E, St. Louis, MO

Built 1981 ADT: 6,669

MO 367 S

Over: US 67

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

Built 2005 ADT: 14,257

MCKELVEY RD S

Over: IS 70

S 11 T 46 N R 5 E, St. Louis, MO

Built 1979 ADT: 48,911

MO 367 S

Over: CRD PARKER RD

S 21 T 47 N R 7 E, St. Louis, MO

Built 2005 ADT: 8,660

MO 367 N

Over: CRD REDMAN RD

S 28 T 47 N R 7 E, St. Louis, MO

Built 2005 ADT: 5,998

MO 367 S

Over: CRD REDMAN RD

S 28 T 47 N R 7 E, St. Louis, MO

Built 2005 ADT: 5,555

MO 367 S

Over: OR 270

S 28 T 47 N R 7 E, St. Louis, MO

Built 2005 ADT: 1,704

IS 270 E

Over: RP IS70E TO IS270E

S 729 T 46 N R 5 E, St. Louis, MO

Built 1979 ADT: 23,163

IS 270 W

Over: RP IS70E TO IS270E

S 729 T 46 N R 5 E, St. Louis, MO

Built 1979 ADT: 23,163

RP IS270W TO IS70E

Over: MO 180

S 131 T 46 N R 5 E, St. Louis, MO

Built 1982 ADT: 27,415

IS 270 E

Over: RP IS70W TO IS270W

S 729 T 46 N R 5 E, St. Louis, MO

Built 1979 ADT: 12,998

IS 270 W

Over: RP IS70W TO IS270W

S 729 T 46 N R 5 E, St. Louis, MO

Built 1979 ADT: 12,998

RP IS70E TO IS270E

Over: RP IS270E TO MO180

S 131 T 46 N R 5 E, St. Louis, MO

Built 1981 ADT: 7,492

IS 70 W

Over: RP IS70E TO IS270E

S 729 T 46 N R 5 E, St. Louis, MO

Built 1978 ADT: 23,163

IS 70 E

Over: RP IS70E TO IS270E

S 729 T 46 N R 5 E, St. Louis, MO

Built 1978 ADT: 23,163

IS 70 W

Over: RP IS70W TO IS270W

S 729 T 46 N R 5 E, St. Louis, MO

Built 1978 ADT: 12,998

IS 70 E

Over: RP IS70W TO IS270W

S 729 T 46 N R 5 E, St. Louis, MO

Built 1978 ADT: 12,998

RP IS270E TO IS70W

Over: IS 270

S 131 T 46 N R 5 E, St. Louis, MO

Built 1982 ADT: 80,758

RP IS270W TO IS70E

Over: RP MO180 TO IS270W

S 131 T 46 N R 5 E, St. Louis, MO

Built 1982 ADT: 6,741

RP IS270W TO IS70E

Over: IS 70

S 131 T 46 N R 5 E, St. Louis, MO

Built 1982 ADT: 84,053

NATURAL BRIDGE RD

Over: US 67

S 12 T 46 N R 5 E, St. Louis, MO

Built 2006 ADT: 9,335

MCKELVEY RD S

Over: IS 270

S 729 T 46 N R 5 E, St. Louis, MO

Built 1979 ADT: 69,810

IS 170 W

Over: MO 340

S 5 T 45 N R 6 E, St. Louis, MO

Built 2006 ADT: 5,284

IS 170 E

Over: MO 340

S 5 T 45 N R 6 E, St. Louis, MO

Built 2006 ADT: 5,284

NEW JAMESTOWN RD E

Over: MO 367

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

Built 2006 ADT: 14,715

IS 170 E

Over: OR 270

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

Built 1978 ADT: 7,910

RP EOR367 TO MO367

Over: MO 367

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

Built 2006 ADT: 14,715

DOUGHERTY FERRY RD

Over: IS 270

S 3 T 44 N R 5 E, St. Louis, MO

Built 2007 ADT: 104,774

MO 231 S

Over: IS 255

S 1 T 43 N R 6 E, St. Louis, MO

Built 2007 ADT: 51,346

BOWLES AVE S

Over: IS 44

S 21 T 44 N R 5 E, St. Louis, MO

Built 1981 ADT: 48,007

RP IS64W TO IS170W

Over: RP HANLEY DR TO IS64W

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

Built 2007 ADT: 9,581

BELLEVUE AVE S

Over: IS 64

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

Built 2008 ADT: 71,559

BOLAND PL S

Over: IS 64

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

Built 2008 ADT: 79,962

S MCKNIGHT RD S

Over: IS 64

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

Built 2008 ADT: 61,811

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