Structure 9513 · Carlton County, MN

Csah 61 over ST Louis River

Carries Csah 61 over ST Louis River, 0.5 Mi NE Of TH 35.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT532 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

532 ft end to end, longest span 132 ft: about 7 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.

Built198739 years old
Length532.2 ft162.2 m
Daily traffic4,973counted 2022
Last inspectedNovember 2024every 12 months

Location

StateMinnesota
CountyCarlton
Location0.5 Mi NE Of TH 35
CarriesCsah 61
CrossesST Louis River
Coordinates46.70398, -92.41740

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length532.2 ft (162.2 m)
Max Span131.9 ft (40.2 m)
Deck Width56.1 ft (17.1 m)
Deck Area2773.6 sq m
Main Spans4
Year Built1987

Traffic

Avg Daily Traffic4,973 (2022)
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical4 — Foundations need monitoring
Structure Number09513

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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