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:

MO 30 E

Over: CST WATER ST

S 373 T 44 N R 5 E, St. Louis, MO

Built 1968 ADT: 973

BIG BEND BLVD E

Over: IS 44

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

Built 1969 ADT: 51,725

BIG BEND BLVD W

Over: IS 44

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

Built 1969 ADT: 51,725

SPIRIT OF ST LOUIS

Over: IS 64

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

Built 1968 ADT: 37,898

RP IS64W TO LONG R

Over: IS 64

S 126 T 45 N R 4 E, St. Louis, MO

Built 1968 ADT: 50,214

LILAC AVE S

Over: IS 270

S 35 T 47 N R 7 E, St. Louis, MO

Built 1961 ADT: 24,158

MO 30 E

Over: MO 141

S 373 T 44 N R 5 E, St. Louis, MO

Built 1970 ADT: 25,106

MO 30 W

Over: MO 141

S 373 T 44 N R 5 E, St. Louis, MO

Built 1970 ADT: 19,677

IS 270 E

Over: CRD BELLEFONTAINE RD

S 34 T 47 N R 7 E, St. Louis, MO

Built 1961 ADT: 13,738

IS 270 W

Over: CRD BELLEFONTAINE RD

S 34 T 47 N R 7 E, St. Louis, MO

Built 1961 ADT: 12,603

IS 255 S

Over: CRD KOCH RD

S 3119 T 43 N R 7 E, St. Louis, MO

Built 1977 ADT: 4,433

IS 255 N

Over: CRD KOCH RD

S 3119 T 43 N R 7 E, St. Louis, MO

Built 1977 ADT: 2,682

MO 109 S

Over: MO 100

S 2 T 44 N R 3 E, St. Louis, MO

Built 1974 ADT: 7,076

IS 170 E

Over: CST GALLERIA PKWY

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

Built 1968 ADT: 4,595

IS 170 W

Over: CST GALLERIA PKWY

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

Built 1968 ADT: 4,595

IS 170 E

Over: CST CLAYTON RD

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

Built 1968 ADT: 14,049

IS 170 W

Over: CST CLAYTON RD

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

Built 1968 ADT: 14,001

IS 170 E

Over: CST S BRENTWOOD BLVD

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

Built 1968 ADT: 11,370

IS 170 W

Over: CST S BRENTWOOD BLVD

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

Built 1968 ADT: 11,370

IS 170 E

Over: CST FOREST PARK PKWY

S 2496 T 45 N R 6 E, St. Louis, MO

Built 1968 ADT: 7,717

IS 170 E

Over: CST LADUE RD

S 2496 T 45 N R 6 E, St. Louis, MO

Built 1968 ADT: 9,502

OLD BONHOMME RD E

Over: IS 170

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

Built 1960 ADT: 50,717

IS 170 E

Over: CST WOODSON RD

S 32 T 46 N R 6 E, St. Louis, MO

Built 1968 ADT: 6,767

IS 170 E

Over: CST NYFLOT AVE

S 2979 T 47 N R 6 E, St. Louis, MO

Built 1978 ADT: 176

IS 170 W

Over: CST NYFLOT AVE

S 2979 T 47 N R 6 E, St. Louis, MO

Built 1978 ADT: 176

IS 170 E

Over: RP BOEING RD TO IS170E

S 2979 T 46 N R 6 E, St. Louis, MO

Built 1980 ADT: 404

IS 170 E

Over: CST FROST AVE

S 2 T 46 N R 6 E, St. Louis, MO

Built 1978 ADT: 2,572

IS 170 W

Over: CST FROST AVE

S 2 T 46 N R 6 E, St. Louis, MO

Built 1978 ADT: 2,572

IS 170 E

Over: CST AIRPORT RD

S 2979 T 46 N R 6 E, St. Louis, MO

Built 1980 ADT: 18,079

IS 170 W

Over: CST AIRPORT RD

S 2979 T 46 N R 6 E, St. Louis, MO

Built 1980 ADT: 18,079

SCUDDER AVE E

Over: IS 170

S 10 T 46 N R 6 E, St. Louis, MO

Built 1977 ADT: 51,972

RP IS170W TO IS70W

Over: IS 170

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

Built 1981 ADT: 51,136

RP IS70E TO IS170W

Over: RP IS170W TO IS70W

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

Built 1981 ADT: 2,160

IS 70 W

Over: RP IS170E TO IS70E

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

Built 1979 ADT: 15,014

RP IS170W TO IS70W

Over: IS 170

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

Built 1981 ADT: 50,071

RP IS70E TO IS170W

Over: RP IS170E TO IS70E

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

Built 1981 ADT: 15,014

IS 70 E

Over: IS 170

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

Built 1979 ADT: 50,071

IS 70 E

Over: RP IS170W TO IS70W

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

Built 1979 ADT: 11,038

RP IS170E TO IS70E

Over: IS 170

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

Built 1981 ADT: 54,851

RP IS70W TO IS170E

Over: RP IS170W TO IS70W

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

Built 1981 ADT: 11,038

IS 70 W

Over: IS 170

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

Built 1979 ADT: 54,851

IS 170 E

Over: MO 115

S 48 T 46 N R 6 E, St. Louis, MO

Built 1979 ADT: 6,214

IS 170 W

Over: MO 115

S 48 T 46 N R 6 E, St. Louis, MO

Built 1979 ADT: 4,525

MO 366 E

Over: US 50

S 13 T 44 N R 5 E, St. Louis, MO

Built 1983 ADT: 21,140

IS 170 W

Over: RP IS170W TO MO180W

S 21 T 46 N R 6 E, St. Louis, MO

Built 1981 ADT: 4,460

IS 170 E

Over: RP IS170E TO MO180E

S 21 T 46 N R 6 E, St. Louis, MO

Built 1981 ADT: 9,625

MIDLAND BLVD E

Over: IS 170

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

Built 1981 ADT: 46,446

IS 170 E

Over: RT D

S 33 T 46 N R 6 E, St. Louis, MO

Built 1980 ADT: 12,249

IS 70 E

Over: MO 141

S 4 T 46 N R 5 E, St. Louis, MO

Built 1971 ADT: 3,360

MO 367 S

Over: CST CHAMBERS RD

S 4 T 46 N R 7 E, St. Louis, MO

Built 2002 ADT: 12,370

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