Structure 7220 · Blue Earth County, MN

Csah 28 over Le Sueur River

Carries Csah 28 over Le Sueur River, 0.1 Mi N Of Jct Csah 15.

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructuresets the rating5/9 · Fair
Substructure7/9 · Good
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT135 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 5/9 · sets the ratingSubstructure 7/9

135 ft end to end, longest span 60 ft. 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.

Built195868 years old
Length135.2 ft41.2 m
Daily traffic628counted 2022
Last inspectedOctober 2024every 24 months

Location

StateMinnesota
CountyBlue Earth
Location0.1 Mi N Of Jct Csah 15
CarriesCsah 28
CrossesLe Sueur River
Coordinates44.08311, -93.85493

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length135.2 ft (41.2 m)
Max Span60.0 ft (18.3 m)
Deck Width30.8 ft (9.4 m)
Deck Area387.3 sq m
Main Spans3
Year Built1958

Traffic

Avg Daily Traffic628 (2022)
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number7220

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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