Structure 7542 · Blue Earth County, MN

Csah 9 over Blue Earth River

Carries Csah 9 over Blue Earth River, 0.5 Mi SW Of Jct Csah 34.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 1 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating1/9 · Imminent Failure
Channelnot part of overall2/9 · Critical
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT616 FT OVERALL100 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 1/9 · sets the rating

616 ft end to end, longest span 140 ft: about 1.7 football fields. 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.

Built198541 years old
Length616.5 ft187.9 m
Daily traffic572counted 2021
Last inspectedOctober 2023every 24 months

Location

StateMinnesota
CountyBlue Earth
Location0.5 Mi SW Of Jct Csah 34
CarriesCsah 9
CrossesBlue Earth River
Coordinates44.09207, -94.10795

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length616.5 ft (187.9 m)
Max Span140.1 ft (42.7 m)
Deck Width52.8 ft (16.1 m)
Deck Area3025.2 sq m
Main Spans5
Year Built1985

Traffic

Avg Daily Traffic572 (2021)
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number07542

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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