Structure 69075 · St. Louis County, MN

US 169 over Mesabi Trail

Carries US 169 over Mesabi Trail, 2.3 Mi E Of N Jct TH 73.

Overall conditionGood

Set by its lowest-rated component: Substructure at 7 of 9.

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT245 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 7/9 · sets the rating

245 ft end to end, longest span 96 ft: about 3 semi-trucks nose to tail. Lengths and the semi-truck on the deck are drawn to the same scale. Each part is colored by its latest inspection rating. The inventory records lengths but not heights or the layout of the shorter spans, so those are drawn as typical for a multi-beam bridge.

Built197254 years old
Length245.4 ft74.8 m
Daily traffic4,600counted 2019
Last inspectedJune 2023every 24 months

Location

StateMinnesota
CountySt. Louis
Location2.3 Mi E Of N Jct TH 73
CarriesUS 169
CrossesMesabi Trail
Coordinates47.47498, -92.85436

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length245.4 ft (74.8 m)
Max Span96.1 ft (29.3 m)
Deck Width50.2 ft (15.3 m)
Deck Area1144.4 sq m
Main Spans3
Year Built1972

Traffic

Avg Daily Traffic4,600 (2019)
Truck Traffic6%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number69075

How Bridge Ratings Work

Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."

0Failed
1Imminent failure
2Critical
3Serious
4Poor
5Fair
6Satisfactory
7Good
8Very good
9Excellent
Good · lowest component 7–9
Fair · lowest component 5–6
Poor · lowest component 0–4

A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.

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