St. Louis County Bridge Report Card

St. Louis County scores 81 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B81 / 100

Local infrastructure snapshot

St. Louis County, Minnesota

St. Louis County has 670 bridges in the National Bridge Inventory, with 41 rated poor and 5 rated scour-critical. Its poor-condition share of 6.1% is above the 4.5% statewide average. Poor-condition bridges carry about 111,720 daily vehicle crossings.

670Total Bridges

41Poor (6.1%)

285Fair (42.5%)

5Scour-Critical

Quote-Ready Local Facts

6.1%of county bridges are in poor condition, compared with 4.5% statewide and 6.7% nationally.

111,720daily vehicle crossings are on poor-condition bridges in the county.

5bridges are rated scour-critical, or 0.7% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives St. Louis County a Bridge Condition Exposure Score of 81/100 (B). The county has 670 bridges in the National Bridge Inventory, including 41 in poor condition and 5 rated scour-critical. Poor-condition bridges carry about 111,720 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	6.1%	12.2
Poor-condition traffic exposure	25	6.4% of measured traffic	4.8
Scour-critical bridge share	20	0.7%	1.5
Average age vs national baseline	10	38 years vs 48 nationally	0.0
Traffic-data completeness	5	1,754,615 measured daily crossings	0.0

Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.

County Comparisons

County Poor-Condition Share	6.1%
State Poor-Condition Share	4.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	0.7%
Average Bridge Age	38 years
Poor-Condition Traffic Exposure	111,720 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI 535 over ST Louis R; Rr Street — 28,098 vehicles/day Oldest Listed BridgeMsas 140 over Ship Canal — built in 1905 All County BridgesBrowse every bridge record in St. Louis County.

Top Bridges to Watch in St. Louis County

Bridge	Reason	Condition	Daily Traffic	Year Built
M 85 over Midway River	Poor condition + traffic exposure	Poor	50	1961
M 330 over W Swan River	Poor condition + traffic exposure	Poor	24	1921
M 340 over E Swan River	Poor condition + traffic exposure	Poor	20	1930
I 535 over ST Louis R; Rr Street	Poor condition + traffic exposure	Poor	28,098	1961
I 35 over Cn Rr	Poor condition + traffic exposure	Poor	22,000	2011
US 169 over Dm;ir Ry	Poor condition + traffic exposure	Poor	12,432	1961
Mn 135 over Dm;ir Ry	Poor condition + traffic exposure	Poor	6,000	1970
US 2 over Midway River	Poor condition + traffic exposure	Poor	5,600	1958
Msas 135 over I 35 Acces;rr Sts; Rr	Poor condition + traffic exposure	Poor	5,258	1966
US 53 over TH 37	Poor condition + traffic exposure	Poor	4,700	1961

Important safety note

Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.