Structure 9811 · Carlton County, MN

Mn 73 over I 35

Carries Mn 73 over I 35, At Jct TH 73; TH 35.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT232 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

232 ft end to end, longest span 73 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.

Built1965rebuilt 1990
Length231.6 ft70.6 m
Daily traffic5,053counted 2022
Last inspectedMay 2024every 24 months

Location

StateMinnesota
CountyCarlton
LocationAt Jct TH 73; TH 35
CarriesMn 73
CrossesI 35
Coordinates46.43637, -92.74557

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length231.6 ft (70.6 m)
Max Span72.8 ft (22.2 m)
Deck Width50.2 ft (15.3 m)
Deck Area1080.2 sq m
Main Spans4
Year Built1965 (reconstructed 1990)

Traffic

Avg Daily Traffic5,053 (2022)
Truck Traffic10%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number09811

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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