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:

CSAH 14

Over: I 35

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

Built 1966 ADT: 28,000

RAILROAD

Over: I 35 SB

AT JCT TH 2, St. Louis, MN

Built 1965 ADT: 40,000

RAILROAD

Over: US 2 EB

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

Built 1965 ADT: 5,200

I 35

Over: I 35 NB OFF RAMP

1.0 MI N OF W JCT TH 2, St. Louis, MN

Built 1965 ADT: 3,000

I 35

Over: US 2 EB

AT JCT I 35; US 2 EB, St. Louis, MN

Built 2009 ADT: 5,200

MSAS 135

Over: I 35, ACCES;RR STS; RR

0.9 MI N OF GARFIELD AVE, St. Louis, MN

Built 1966 ADT: 34,500

I 35

Over: CP RAIL, RAMPS; STRS

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

Built 1969 ADT: 1,550

I 35

Over: CP RAIL; STREETS

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

Built 1969 ADT: 9,500

CON 3537

Over: 58TH AVE W; 59TH AVE W

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

Built 1969 ADT: 500

CON 3381

Over: 57TH AVE W

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

Built 1969 ADT: 750

CON 723

Over: 57TH AVE W

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

Built 1969 ADT: 750

PEDESTRIAN

Over: I 35; TWO RAMPS

0.4 MI NE OF GARFIELD AV, St. Louis, MN

Built 1968 ADT: 9,000

RAILROAD

Over: I 35, N ; S FRONTAGE RDS

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

Built 1975 ADT: 960

I 35

Over: CSAH 61 AT COUNTY LINE

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

Built 1974 ADT: 2,800

I 35

Over: CSAH 61 AT COUNTY LINE

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

Built 1974 ADT: 2,800

I 35

Over: MIDWAY RD(CSAH 13)

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

Built 1976 ADT: 3,550

I 35

Over: MIDWAY RD(CSAH 13)

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

Built 1975 ADT: 3,550

MSAS 115

Over: I 35

0.5 MI S OF JCT I 535, St. Louis, MN

Built 2021 ADT: 44,000

RAILROAD

Over: US 2

5.2 MI S OF JCT TH 194, St. Louis, MN

Built 1958 ADT: 3,250

UTILITIES

Over: US 169

0.8 MI E OF W CO LINE, St. Louis, MN

Built 1973 ADT: 9,300

SKYWAY

Over: MSAS 171 (SUPERIOR ST)

E OF 1ST AVE W, St. Louis, MN

Built 1980 ADT: 7,136

SKYWAY

Over: MSAS 171 (SUPERIOR ST)

E OF 4TH AVE W, St. Louis, MN

Built 1985 ADT: 7,136

SKYWAY

Over: MSAS 171(SUPERIOR ST)

WEST OF 1ST AVE W, St. Louis, MN

Built 1986 ADT: 7,337

US 53

Over: TH 37

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

Built 1961 ADT: 3,800

MSAS 203

Over: MILLER CREEK; STREET

0.1 MI S OF JCT TH53, St. Louis, MN

Built 1927 ADT: 175

SKYWAY

Over: MSAS 171 (SUPERIOR ST)

EAST OF 3RD AVE W, St. Louis, MN

Built 1978 ADT: 7,337

SKYWAY

Over: E 1ST ST ALLEY

150 FT NW JCT SUPERIOR ST, St. Louis, MN

Built 2004 ADT: 1

SKYWAY

Over: 10TH AVE E

0.1 MI NW JCT SUPERIOR ST, St. Louis, MN

Built 2015 ADT: 4,800

SKYWAY

Over: N 4TH AVE E

120 FT SE OF JCT E 1ST ST, St. Louis, MN

Built 2023 ADT: 1

BUILDING

Over: E 1ST STREET

360FT NE OF JCT 4TH AVE E, St. Louis, MN

Built 2023 ADT: 3,800

BUILDING

Over: 1ST ST ALLEY

125FT NE OF JCT 4TH AVE E, St. Louis, MN

Built 2023 ADT: 1

M 330

Over: W SWAN RIVER

0.9 MI S OF JCT CR606, St. Louis, MN

Built 1921 Load: 3.3 t ADT: 52

M 846

Over: TISCHERS CREEK

0.1 MI W OF JCT CSAH 9, St. Louis, MN

Built 1973 Load: 11.4 t ADT: 15

T 1419

Over: ELBOW RIVER

0.6 MI N OF JCT CR 905, St. Louis, MN

Built 1987 Load: 13.4 t ADT: 50

CR 848

Over: JOE MARTIN BROOK

1.4 MI S OF JCT TH 2, St. Louis, MN

Built 1998 Load: 14.3 t ADT: 125

CSAH 10

Over: LESTER RIVER

0.4 MI W OF JCT CSAH12, St. Louis, MN

Built 1948 Load: 16.3 t ADT: 730

CR 207

Over: STONE RIVER

1.1 MI S OF JCT CSAH28, St. Louis, MN

Built 1969 Load: 17.2 t ADT: 10

UT 9223

Over: MUD HEN CREEK

0.3 MI N OF JCT CSAH 16, St. Louis, MN

Built 1988 Load: 17.3 t ADT: 5

MSAS 140

Over: SHIP CANAL

0.6 MI SE OF SUPERIOR ST, St. Louis, MN

Built 1905 Load: 18.8 t ADT: 6,143

MN 23

Over: MISSION CREEK

0.3 MI E OF JCT TH 210, St. Louis, MN

Built 1937 Load: 19.6 t ADT: 2,000

UNDETERMINED RD

Over: MUD CREEK

2.2 MI N OF JCT CR 408, St. Louis, MN

Built 1985 Load: 20.4 t ADT: 1

CR 688

Over: DARK RIVER

0.7 MI E OF JCT TH 73, St. Louis, MN

Built 2001 Load: 20.6 t ADT: 5

CR 245

Over: STREAM

0.5 MI N OF JCT CR 259, St. Louis, MN

Built 1982 Load: 21.5 t ADT: 60

CSAH 4

Over: ISLAND LAKE

0.6 MI S OF JCT CR269, St. Louis, MN

Built 1949 Load: 22.9 t ADT: 2,907

T 5

Over: PALEFACE RIVER

0.3 MI W OF JCT CSAH 59, St. Louis, MN

Built 1987 Load: 22.9 t ADT: 4

CR 344

Over: WATER HEN CREEK

0.3 MI S OF JCT CSAH 16, St. Louis, MN

Built 1980 Load: 22.9 t ADT: 5

T 1403

Over: RICE RIVER

0.5 MI N OF JCT CSAH 87, St. Louis, MN

Built 1978 Load: 23.0 t ADT: 8

CSAH 4

Over: WHITEFACE RIVER

1.6 MI S OF JCT CR333, St. Louis, MN

Built 1965 Load: 23.3 t ADT: 760

CSAH 133

Over: ST LOUIS RIVER

0.5 MI W OF JCT CR226, St. Louis, MN

Built 1976 Load: 23.9 t ADT: 230

CSAH 40

Over: SUCKER RIVER

0.1 MI W OF JCT CR693, St. Louis, MN

Built 1959 Load: 23.9 t ADT: 145

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