Structure 69565 · St. Louis County, MN

Csah 57 over US 169

Carries Csah 57 over US 169, 1.0 Mi E Of S Jct TH 73.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT251 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 8/9

251 ft end to end, longest span 130 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.

Built198739 years old
Length250.7 ft76.4 m
Daily traffic3,550counted 2019
Last inspectedMay 2023every 24 months

Location

StateMinnesota
CountySt. Louis
Location1.0 Mi E Of S Jct TH 73
CarriesCsah 57
CrossesUS 169
Coordinates47.40016, -92.94135

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length250.7 ft (76.4 m)
Max Span129.9 ft (39.6 m)
Deck Width52.5 ft (16 m)
Deck Area1222.4 sq m
Main Spans2
Year Built1987

Traffic

Avg Daily Traffic3,550 (2019)
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number69565

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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