St. Louis County, MN

641 public highway bridges

St. Louis County Bridge Snapshot

St. Louis County, Minnesota contains 641 public highway bridges in the FHWA National Bridge Inventory. Roughly 48.2% are rated “Good,” 34.2% “Fair,” 5% “Poor,” and 5% 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 MN 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.

641

Total Bridges

48.2%

Good

5%

Poor

5%

Structurally Deficient

Condition Distribution

Good

48.2% (309)

Fair

34.2% (219)

Poor

5% (32)

SD

5% (32)

All Bridges (641)

Sort:

RAILROAD

Over: US 2

1.7 MI E OF JCT TH 33, St. Louis, MN

Built 1932 ADT: 5,200

US 53

Over: 6TH AVE W

1.3 MI SE OF JCT TH 169, St. Louis, MN

Built 1962 ADT: 1,800

US 53

Over: 6TH AVE W

1.3 MI SE OF JCT TH 169, St. Louis, MN

Built 1970 ADT: 1,800

RAILROAD

Over: US 53

3.1 MI N OF JCT TH 169, St. Louis, MN

Built 1975 ADT: 12,154

US 169

Over: US 53

AT THE JCT TH 169; 53, St. Louis, MN

Built 1969 ADT: 12,300

M 372

Over: US 53

0.25 MI N OF JCT TH 35, St. Louis, MN

Built 2003 ADT: 22,900

US 169

Over: CSAH 102

2.6 MI W OF JCT TH 53, St. Louis, MN

Built 1970 ADT: 2,450

US 169

Over: CSAH 102

2.6 MI W OF JCT TH 53, St. Louis, MN

Built 1970 ADT: 2,450

MN 33

Over: US 53 SB

AT THE JCT TH 33; 53, St. Louis, MN

Built 2012 ADT: 3,950

RAILROAD

Over: US 169

4.0 MI E OF N JCT TH 73, St. Louis, MN

Built 1979 ADT: 9,000

US 169

Over: TH 73 NB

AT THE N JCT TH 169; 73, St. Louis, MN

Built 1979 ADT: 2,750

US 169

Over: TH 73 NB

AT THE N JCT TH 169; 73, St. Louis, MN

Built 1979 ADT: 2,750

US 2

Over: ST LOUIS R, TH35; RR

AT WISCONSIN STATE LINE, St. Louis, MN

Built 1982 ADT: 44,500

CON 5873

Over: I 35 RAMP; LAKE

AT THE JCT TH 2; 35, St. Louis, MN

Built 1983 ADT: 2,500

CON 3544

Over: I 35, RAMPS; LAKE

AT THE E JCT TH 35; 2, St. Louis, MN

Built 1983 ADT: 1,500

MN 33

Over: CR 694; DM;IR RY

1.5 MI N OF JCT TH 2, St. Louis, MN

Built 1986 ADT: 115

MN 33

Over: CR 694; DM;IR RY

1.5 MI N OF JCT TH 2, St. Louis, MN

Built 1986 ADT: 145

MN 33

Over: US 2

AT THE JCT TH 33; 2, St. Louis, MN

Built 1987 ADT: 5,000

MN 33

Over: US 2

AT THE JCT OF TH 33; 2, St. Louis, MN

Built 1987 ADT: 5,000

MSAS 113

Over: US 53

0.75 MI N OF JCT TH 35, St. Louis, MN

Built 2003 ADT: 23,600

US 53

Over: TH 169

AT THE N JCT TH 53; 169, St. Louis, MN

Built 2004 ADT: 5,900

US 53

Over: TH 169

AT THE N JCT TH 53; 169, St. Louis, MN

Built 2004 ADT: 6,500

MN 135

Over: US 53

0.1 MI N OF JCT US 53, St. Louis, MN

Built 2016 ADT: 22,200

MN 37

Over: US 53

AT JCT TH 37; 53, St. Louis, MN

Built 2018 ADT: 9,300

PEDESTRIAN

Over: I 35, FRONT RDS;STREET

1.5 MI NE OF JCT TH 535, St. Louis, MN

Built 1977 ADT: 3,550

CSAH 57

Over: US 169

1.0 MI E OF S JCT TH 73, St. Louis, MN

Built 1987 ADT: 12,800

MN 194

Over: 2ND AVE W RAMP

0.7 MI N OF JCT TH 35, St. Louis, MN

Built 1988 ADT: 2,500

CSAH 61

Over: ACCESS RD

.08 MI W OF JCT CSAH 33, St. Louis, MN

Built 2004 ADT: 20

SKYWAY

Over: E 1ST ST

0.2 MI SE OF JCT CSAH 9, St. Louis, MN

Built 2001 ADT: 3,700

MSAS 149

Over: I 35, Michigan ST; RR

0.5 MI NE OF JCT TH 535, St. Louis, MN

Built 1983 ADT: 3,200

I 535

Over: SB GARFIELD; BNSF RR

0.7 MI S OF JCT TH 35, St. Louis, MN

Built 1969 ADT: 2,300

CON 504

Over: GARFIELD NB; SB; RR

0.7 MI S OF JCT TH 35, St. Louis, MN

Built 1969 ADT: 2,300

PEDESTRIAN

Over: I 35

AT ORE DOCKS, St. Louis, MN

Built 1967 ADT: 44,000

I 35

Over: S UGSTAD RD (CSAH 45)

2.3 MI SW OF W JCT TH 2, St. Louis, MN

Built 1975 ADT: 1,206

MSAS 140

Over: I 35, FRRD, MICH; LK PL

2.0 MI NE OF JCT TH 535, St. Louis, MN

Built 1982 ADT: 1,000

CON 3744

Over: I 35;SB OFF RAMP

2.3 MI NE OF JCT TH 535, St. Louis, MN

Built 1987 ADT: 3,000

I 35

Over: SL;LC RR; TH 194 NB

0.3 MI SW OF JCT 5TH AVE, St. Louis, MN

Built 1985 ADT: 9,250

I 35

Over: SL;LC RR; TH 194 NB

0.3 MI SW OF JCT 5TH AVE, St. Louis, MN

Built 1985 ADT: 9,250

PLAZA

Over: I 35, SB RAMP; MICH ST

2.3 MI NE OF JCT TH 535, St. Louis, MN

Built 1987 ADT: 4,300

MSAS 171

Over: I 35

2.7 MI NE OF JCT TH 535, St. Louis, MN

Built 1983 ADT: 20,400

MSAS 171

Over: I 35

2.5 MI NE OF JCT TH 535, St. Louis, MN

Built 1986 ADT: 20,400

MSAS 110

Over: I 35

1.5 MI SW OF JCT TH 535, St. Louis, MN

Built 1967 ADT: 44,000

MSAS 109

Over: I 35; SBOFF RAMP

1.3 MI SW OF JCT TH 535, St. Louis, MN

Built 1967 ADT: 1

RAILROAD

Over: I 35

AT ORE DOCKS, St. Louis, MN

Built 1966 ADT: 44,000

PEDESTRIAN

Over: I 35

3.5 MI N OF JCT TH 535, St. Louis, MN

Built 1988 ADT: 20,400

MSAS 194

Over: TH 194 SB

AT JCT TH 35, St. Louis, MN

Built 1969 ADT: 12,050

MN 194

Over: SUPERIOR ST(MSAS171)

0.2 MI N OF JCT TH 35, St. Louis, MN

Built 1968 ADT: 11,960

MSAS 152

Over: I 35, SL;LC RR

3.8 MI NE OF JCT TH 535, St. Louis, MN

Built 1988 ADT: 18,800

PEDESTRIAN

Over: I 35

4.1 MI NE OF JCT TH 535, St. Louis, MN

Built 1990 ADT: 18,800

I 35

Over: RECYCLE WAY

3.7 MI SW OF JCT TH 535, St. Louis, MN

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