Structure 9706 · Mower County, MN

Csah 15 over I 90

Carries Csah 15 over I 90, 7.5 Mi SW Of Jct TH 63.

Overall conditionFair

Set by its lowest-rated component: Deck at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructure6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT273 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 6/9

273 ft end to end, longest span 90 ft: about 4 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.

Built196165 years old
Length273.3 ft83.3 m
Daily traffic270counted 2016
Last inspectedAugust 2024every 24 months

Location

StateMinnesota
CountyMower
Location7.5 Mi SW Of Jct TH 63
CarriesCsah 15
CrossesI 90
Coordinates43.80492, -92.58849

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length273.3 ft (83.3 m)
Max Span89.6 ft (27.3 m)
Deck Width33.5 ft (10.2 m)
Deck Area849.7 sq m
Main Spans4
Year Built1961

Traffic

Avg Daily Traffic270 (2016)
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number9706

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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