Structure 69608 · St. Louis County, MN

Csah 4 over Dm;ir Ry

Carries Csah 4 over Dm;ir Ry, 0.6 Mi S Of Jct TH 135.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · 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 FT216 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

216 ft end to end, longest span 80 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.

Built199432 years old
Length215.6 ft65.7 m
Daily traffic1,450counted 2019
Last inspectedMay 2024every 24 months

Location

StateMinnesota
CountySt. Louis
Location0.6 Mi S Of Jct TH 135
CarriesCsah 4
CrossesDm;ir Ry
Coordinates47.52293, -92.33347

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length215.6 ft (65.7 m)
Max Span80.4 ft (24.5 m)
Deck Width47.2 ft (14.4 m)
Deck Area946.1 sq m
Main Spans3
Year Built1994

Traffic

Avg Daily Traffic1,450 (2019)
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number69608

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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