Structure 6596 · Marquette County, MI

Jad Road (old M41) over Carp River

Carries Jad Road (old M41) over Carp River, 0.02 Mi N Of Us-41.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 2 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating2/9 · Critical
Channelnot part of overall4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT49 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 2/9 · sets the rating

49 ft end to end, longest span 17 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.

Built194680 years old
Length48.9 ft14.9 m
Daily traffic100counted 1994
Last inspectedJuly 2024every 12 months

Location

StateMichigan
CountyMarquette
Location0.02 Mi N Of Us-41
CarriesJad Road (old M41)
CrossesCarp River
Coordinates46.52418, -87.57594

Physical Characteristics

MaterialWood or Timber
DesignSlab
Total Length48.9 ft (14.9 m)
Max Span16.7 ft (5.1 m)
Deck Width43.3 ft (13.2 m)
Deck Area196.7 sq m
Main Spans3
Year Built1946

Traffic

Avg Daily Traffic100 (1994)
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number000000000006596

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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