Structure 12052 · Wayne County, MI

Rotunda Drive over Schaefer Road

Carries Rotunda Drive over Schaefer Road, Dearborn N/i-94.

Overall conditionPoor

Set by its lowest-rated component: Substructure at 4 of 9.

How ratings work
Deck5/9 · Fair
Superstructure7/9 · Good
Substructuresets the rating4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT95 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 7/9Substructure 4/9 · sets the rating

95 ft end to end, longest span 31 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 multi-beam bridge.

Built1932rebuilt 1987
Length94.8 ft28.9 m
Daily traffic18,726counted 1995
Last inspectedOctober 2024every 12 months

Location

StateMichigan
CountyWayne
LocationDearborn N/i-94
CarriesRotunda Drive
CrossesSchaefer Road
Coordinates42.31404, -83.17561

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length94.8 ft (28.9 m)
Max Span30.8 ft (9.4 m)
Deck Width72.5 ft (22.1 m)
Deck Area638.7 sq m
Main Spans4
Year Built1932 (reconstructed 1987)

Traffic

Avg Daily Traffic18,726 (1995)
Truck Traffic8%
Lanes On Bridge5
Lanes Under Bridge4

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000012052

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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