Structure 29532 · Hubbard County, MN

Csah 18 over Shallow River

Carries Csah 18 over Shallow River, 2.1 Mi W Of Jct Csah 2.

Overall conditionGood

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

How ratings work
Decksets the rating8/9 · Very Good
Superstructuresets the rating8/9 · Very Good
Substructuresets the rating8/9 · Very Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT68 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 8/9

68 ft end to end, longest span 25 ft. 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 slab bridge.

Built201313 years old
Length67.6 ft20.6 m
Daily traffic957counted 2021
Last inspectedSeptember 2023every 24 months

Location

StateMinnesota
CountyHubbard
Location2.1 Mi W Of Jct Csah 2
CarriesCsah 18
CrossesShallow River
Coordinates46.96138, -94.88616

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length67.6 ft (20.6 m)
Max Span24.9 ft (7.6 m)
Deck Width35.4 ft (10.8 m)
Deck Area222.5 sq m
Main Spans3
Year Built2013

Traffic

Avg Daily Traffic957 (2021)
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number29532

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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