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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 August 20, 2026

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 August 20, 2026.
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.

Every bridge in St. Louis County → - all 670, busiest first, each with its own condition record.

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.