Structure 6823 · Menominee County, MI

Route 386 over Big Cedar River

Carries Route 386 over Big Cedar River, 3mi SE Of Wilson.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT72 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

72 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 box-beam bridge.

Built197947 years old
Length71.9 ft21.9 m
Daily traffic1502 lanes
Last inspectedJune 2023every 24 months

Location

StateMichigan
CountyMenominee
Location3mi SE Of Wilson
CarriesRoute 386
CrossesBig Cedar River
Coordinates45.66685, -87.39929

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length71.9 ft (21.9 m)
Max Span68.9 ft (21 m)
Deck Width30.8 ft (9.4 m)
Deck Area205.9 sq m
Main Spans1
Year Built1979

Traffic

Avg Daily Traffic150
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number000000000006823

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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