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:

RP MISSOURI BOTTOM

Over: MO 370

S 2039 T 46 N R 5 E, St. Louis, MO

Built 1990 ADT: 16,512

MATTIS RD E

Over: IS 55

S 4 T 43 N R 6 E, St. Louis, MO

Built 1995 ADT: 153,270

MO 141 N

Over: MO 370

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

Built 1991 ADT: 23,308

TAUSSIG AVE E

Over: MO 370

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

Built 1991 ADT: 22,847

IS 270 W

Over: RP IS270E TO MO370W

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

Built 1990 ADT: 6,769

MO 100 E

Over: CST DES PERES RD

S 33 T 45 N R 5 E, St. Louis, MO

Built 1995 ADT: 2,888

RP IS270W TO US67

Over: RP IS55N TO IS255S

S 302 T 44 N R 6 E, St. Louis, MO

Built 1995 ADT: 8,015

US 50 E

Over: IS 55

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

Built 1995 ADT: 53,205

RP IS70W TO NATURA

Over: CST CYPRESS RD

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

Built 1994 ADT: 5,050

IS 55 S

Over: CST GREEN PARK RD

S 26 T 44 N R 6 E, St. Louis, MO

Built 1962 ADT: 4,510

IS 55 N

Over: CST GREEN PARK RD

S 26 T 44 N R 6 E, St. Louis, MO

Built 1962 ADT: 4,510

MERAMEC BOTTOM RD

Over: IS 55

S 17 T 43 N R 6 E, St. Louis, MO

Built 1996 ADT: 61,276

OR 44 E

Over: IS 270

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

Built 1996 ADT: 88,692

RP IS44W TO IS270W

Over: RP IS270E TO IS44W

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

Built 1996 ADT: 10,781

SAPPINGTON RD S

Over: IS 270

S 3112 T 55 N R 6 E, St. Louis, MO

Built 1995 ADT: 89,457

BENNINGTON PL N

Over: MO 364

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

Built 1997 ADT: 29,109

MO 141 S

Over: MO 100

S 31 T 45 N R 4 E, St. Louis, MO

Built 1997 ADT: 23,768

RT D E

Over: US 67

S 25 T 46 N R 5 E, St. Louis, MO

Built 1961 ADT: 10,946

US 67 S

Over: MO 180

S 406 T 46 N R 5 E, St. Louis, MO

Built 1969 ADT: 16,087

IS 270 E

Over: MO 367

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

Built 1961 ADT: 8,801

IS 44 E

Over: MO 141

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

Built 1958 ADT: 21,079

MO 21 S

Over: CRD MERAMEC BOTTOM RD

S 13 T 43 N R 4 E, St. Louis, MO

Built 1940 ADT: 4,361

ANTIRE RD S

Over: IS 44

S 34 T 44 N R 4 E, St. Louis, MO

Built 1958 ADT: 36,310

MO 115 N

Over: IS 70

S 9 T 46 N R 6 E, St. Louis, MO

Built 1958 ADT: 59,530

MO 180 E

Over: IS 70

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

Built 1957 ADT: 48,911

MO 180 W

Over: IS 70

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

Built 1957 ADT: 36,917

FEE FEE RD S

Over: IS 70

S 406 T 46 N R 5 E, St. Louis, MO

Built 1957 ADT: 36,917

US 67 S

Over: IS 70

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

Built 1957 ADT: 50,178

US 67 N

Over: IS 70

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

Built 1957 ADT: 39,744

IS 70 W

Over: CST MAIN ST

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

Built 1958 ADT: 6,104

MO 100 E

Over: IS 270

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

Built 1962 ADT: 104,774

BIG BEND RD E

Over: IS 270

S 10 T 44 N R 5 E, St. Louis, MO

Built 1962 ADT: 111,629

IS 270 E

Over: CRD MARSHALL RD

S 10 T 44 N R 5 E, St. Louis, MO

Built 1962 ADT: 4,808

IS 270 W

Over: CRD MARSHALL RD

S 10 T 44 N R 5 E, St. Louis, MO

Built 1962 ADT: 4,808

IS 70 E

Over: IS 270

S 15 T 46 N R 5 E, St. Louis, MO

Built 1957 ADT: 80,758

IS 270 E

Over: MO 180

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

Built 1960 ADT: 27,415

IS 270 E

Over: MO 366

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

Built 1962 ADT: 9,784

IS 270 E

Over: CST ROTT RD

S 23 T 44 N R 5 E, St. Louis, MO

Built 1967 ADT: 4,077

IS 270 W

Over: CST ROTT RD

S 23 T 44 N R 5 E, St. Louis, MO

Built 1967 ADT: 4,077

MO 30 E

Over: IS 270

S 3117 T 44 N R 6 E, St. Louis, MO

Built 1966 ADT: 83,497

MO 21 S

Over: IS 270

S 1998 T 44 N R 6 E, St. Louis, MO

Built 1967 ADT: 90,084

IS 270 E

Over: CRD VON TALGE RD

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

Built 1967 ADT: 3,107

IS 270 E

Over: RT AB

S 10 T 45 N R 5 E, St. Louis, MO

Built 1964 ADT: 7,062

IS 270 W

Over: RT AB

S 10 T 45 N R 5 E, St. Louis, MO

Built 1964 ADT: 7,062

IS 270 E

Over: CST CONWAY RD

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

Built 1964 ADT: 6,789

LACLEDE STATION RD

Over: BLACK CREEK BR

S 2484 T 45 N R 6 E, St. Louis, MO

Built 1972 Load: 9.9 t ADT: 5,000

W BRUNO AVE

Over: BLACK CREEK BR

S 2484 T 45 N R 6 E, St. Louis, MO

Built 1976 Load: 9.9 t ADT: 2,500

FRANKLIN RD

Over: CLEAR CR

S 18 T 43 N R 3 E, St. Louis, MO

Built 1923 Load: 11.7 t ADT: 1

OLD SMIZER MILL RD

Over: FENTON CR

S 28 T 44 N R 6 E, St. Louis, MO

Built 1930 Load: 11.7 t ADT: 11

HOLMES AVE

Over: GRAVOIS CR

S 1936 T 44 N R 6 E, St. Louis, MO

Built 1970 Load: 11.7 t ADT: 2,000

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