Bridge conditions in St. Louis County, Minnesota
670 inventoried bridges · 41 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
St. Louis County tracks close to typical: 41 of its 670 inventoried bridges (6.1%) are rated poor, against a national rate of about 7%.
- 41 of the 670 bridges in St. Louis County, Minnesota, are rated in poor condition (6.1%) in the 2025 National Bridge Inventory, as of .
- 344 bridges (51.3%) are rated good and 285 (42.5%) fair.
- The median St. Louis County bridge was built in 1988.
- The busiest poor-rated bridge is I 535 over St Louis R; RR Street (built 1961), carrying about 28,098 vehicles a day.
Good 51.3% · Fair 42.5% · Poor 6.1% of 670 bridges
Bridges rated poor
Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 535 over St Louis R; RR Street | 1961 | 28,098 | Poor |
| I 35 over Cn RR | 2011 | 22,000 | Poor |
| US 169 over Dm;ir Ry | 1961 | 12,432 | Poor |
| Mn 135 over Dm;ir Ry | 1970 | 6,000 | Poor |
| US 2 over Midway River | 1958 | 5,600 | Poor |
| Msas 135 over I 35 Acces;rr Sts; RR | 1966 | 5,258 | Poor |
| US 53 over Th 37 | 1961 | 4,700 | Poor |
| US 53 over Th 37 | 1961 | 4,700 | Poor |
| US 169 over DM;IR RY (Abandon) | 1979 | 4,600 | Poor |
| Csah 14 over I 35 | 1966 | 4,150 | Poor |
| US 53 over Paleface River | 1964 | 3,845 | Poor |
| Mn 135 over Dm&ir Ry | 1971 | 3,830 | Poor |
| Csah 21 over Pike River | 1957 | 1,750 | Poor |
| Msas 108 over BNSF RR | 1959 | 1,064 | Poor |
| Mn 73 over Joula Creek | 1950 | 570 | Poor |
| Csah 44 over Cloquet River | 1963 | 375 | Poor |
| Csah 44 over Petrel Creek | 1938 | 375 | Poor |
| Csah 25 over Dark River | 1940 | 365 | Poor |
| Msas 203 over Miller Creek; Street | 1927 | 358 | Poor |
| M 846 over Tischers Creek | 1965 | 220 | Poor |
| Csah 87 over Rice River | 1985 | 200 | Poor |
| CR 851 over Stoney Brook River | 1941 | 200 | Poor |
| Csah 74 over Stream | 1966 | 195 | Poor |
| Csah 40 over Sucker River | 1938 | 145 | Poor |
| Csah 93 over Water Hen Creek | 1937 | 125 | Poor |
| CR 836 over East Savanna River | 1979 | 125 | Poor |
| Csah 78 over Little Fork River | 1984 | 90 | Poor |
| Csah 24 over Eight Mile Creek | 1977 | 85 | Poor |
| M 85 over Midway River | 1961 | 50 | Poor |
| Csah 49 over Us-kab-wan-ka River | 1983 | 40 | Poor |
| Csah 62 over East Two Rivers | 1938 | 40 | Poor |
| Whiteface River Rd over N. Br. Whiteface River | 1967 | 30 | Poor |
| CR 914 over Little Fork River | 1990 | 30 | Poor |
| M 330 over W Swan River | 1921 | 24 | Poor |
| M 340 over E Swan River | 1930 | 20 | Poor |
| Ut 921 over Sturgeon River | 1986 | 15 | Poor |
| Ut 900 over Little Fork River | 1982 | 5 | Poor |
| CR 931 over Sturgeon River | 1919 | 5 | Poor |
| T 6205 over Breda Creek | 1969 | 4 | Poor |
| Undetermined Rd over Creek | 1921 | 1 | Poor |
| Ut 3086 over Ash River | 1980 | 1 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I 35 over Miller & Coffee Creek | 2022 | 46,000 | Good |
| I 35 over Unstable Material | 1970 | 45,454 | Fair |
| I 35 over Recycle Way | 2011 | 38,802 | Good |
| I 35 over I 35 NB Off Ramp | 1965 | 35,500 | Fair |
| I 35 over Abandoned City St | 1969 | 35,500 | Fair |
| I 535 over SB Garfield; BNSF RR | 1969 | 28,098 | Fair |
| I 535 over BNSF RR | 1969 | 28,098 | Good |
| I 535 over St Louis R; RR Street | 1961 | 28,098 | Poor |
| I 35 over Kingsbury Creek | 1922 | 28,000 | Fair |
| I 35 over US 2 EB | 2009 | 28,000 | Good |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Minnesota: Minnesota bridge conditions by county · every download on the data page.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.