Structure 38534 · Lake County, MN

Csah 9 over Knife River

Carries Csah 9 over Knife River, 2.0 Mi W Of Jct Mn 61.

Overall conditionGood

Set by its lowest-rated component: Deck at 8 of 9.

How ratings work
Decksets the rating8/9 · Very Good
Superstructure9/9 · Excellent
Substructure9/9 · Excellent
Channelnot part of overall9/9 · Excellent
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT105 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9 · sets the ratingSuperstructure 9/9Substructure 9/9

105 ft end to end. Lengths and the car 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.

Built20215 years old
Length104.7 ft31.9 m
Daily traffic744counted 2022
Last inspectedJanuary 2024every 24 months

Location

StateMinnesota
CountyLake
Location2.0 Mi W Of Jct Mn 61
CarriesCsah 9
CrossesKnife River
Coordinates47.01174, -91.75218

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length104.7 ft (31.9 m)
Max Span102.0 ft (31.1 m)
Deck Width35.1 ft (10.7 m)
Deck Area341.3 sq m
Main Spans1
Year Built2021

Traffic

Avg Daily Traffic744 (2022)
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical5 — Stable for scour
Structure Number38534

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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