Structure 78508 · Traverse County, MN

Csah 9 over Mustinka River

Carries Csah 9 over Mustinka River, 0.8 Mi NW Of Jct TH 27.

Overall conditionGood

Set by its lowest-rated component: Deck and Superstructure and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT120 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

120 ft end to end, longest span 45 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.

Built199135 years old
Length119.8 ft36.5 m
Daily traffic530counted 2020
Last inspectedOctober 2023every 24 months

Location

StateMinnesota
CountyTraverse
Location0.8 Mi NW Of Jct TH 27
CarriesCsah 9
CrossesMustinka River
Coordinates45.81377, -96.50877

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length119.8 ft (36.5 m)
Max Span44.9 ft (13.7 m)
Deck Width39.4 ft (12 m)
Deck Area438 sq m
Main Spans3
Year Built1991

Traffic

Avg Daily Traffic530 (2020)
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 Critical8 — Stable, low risk
Structure Number78508

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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