Structure 11982 · Wayne County, MI

I-275 NB Collector over Schoolcraft RD

Carries I-275 NB Collector over Schoolcraft RD, 0.2 Mi W Of Livonia.

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
0 failed4 poor6 fair9 excellent

Elevation

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

294 ft end to end, longest span 97 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 multi-beam bridge.

Built1971rebuilt 2001
Length294.0 ft89.6 m
Daily traffic—reported figure implausible
Last inspectedSeptember 2024every 24 months

Location

StateMichigan
CountyWayne
Location0.2 Mi W Of Livonia
CarriesI-275 NB Collector
CrossesSchoolcraft RD
Coordinates42.38298, -83.43642

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length294.0 ft (89.6 m)
Max Span96.8 ft (29.5 m)
Deck Width30.8 ft (9.4 m)
Deck Area842.2 sq m
Main Spans4
Year Built1971 (reconstructed 2001)

Traffic

Avg Daily Traffic65,653 (2007)
That is about 65,653 vehicles per lane per day — beyond what any U.S. road carries (the busiest freeways run about 25,000–30,000). It is almost certainly a data-entry error in the National Bridge Inventory, so we leave this bridge out of traffic rankings.
Truck Traffic6%
Lanes On Bridge1
Lanes Under Bridge4

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000011982

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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