Structure 55804 · Olmsted County, MN

I 90 over Csah 20

Carries I 90 over Csah 20, 3.1 Mi NE Of Jct TH 63.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT151 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

151 ft end to end, longest span 60 ft: about 2 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.

Built196957 years old
Length151.2 ft46.1 m
Daily traffic2,700counted 2014
Last inspectedSeptember 2024every 24 months

Location

StateMinnesota
CountyOlmsted
Location3.1 Mi NE Of Jct TH 63
CarriesI 90
CrossesCsah 20
Coordinates43.91036, -92.43851

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length151.2 ft (46.1 m)
Max Span59.7 ft (18.2 m)
Deck Width44.6 ft (13.6 m)
Deck Area627.0 sq m
Main Spans3
Year Built1969

Traffic

Avg Daily Traffic2,700 (2014)
Truck Traffic24%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number55804

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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