Structure 9674 · Schoolcraft County, MI

M-94 over Manistique River

Carries M-94 over Manistique River, In Manistique.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT294 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 7/9

294 ft end to end, longest span 39 ft: about 4 semi-trucks nose to tail. 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 slab bridge.

Built1918rebuilt 2004
Length293.6 ft89.5 m
Daily traffic10,220counted 2007
Last inspectedSeptember 2023every 24 months

Location

StateMichigan
CountySchoolcraft
LocationIn Manistique
CarriesM-94
CrossesManistique River
Coordinates45.96181, -86.24957

Physical Characteristics

MaterialConcrete Continuous
DesignSlab
Total Length293.6 ft (89.5 m)
Max Span39.0 ft (11.9 m)
Deck Width65.9 ft (20.1 m)
Deck Area1799.0 sq m
Main Spans5
Year Built1918 (reconstructed 2004)

Traffic

Avg Daily Traffic10,220 (2007)
Truck Traffic3%
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000009674

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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