Structure 2686 · Genesee County, MI

I-475 over Detroit ST

Carries I-475 over Detroit ST, 3.0 Mi E Of N Jct I-75.

Overall conditionGood

Set by its lowest-rated component: Deck at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructure8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT112 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 8/9

112 ft end to end, longest span 45 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.

Built197155 years old
Length111.9 ft34.1 m
Daily traffic23,600counted 2016
Last inspectedApril 2024every 24 months

Location

StateMichigan
CountyGenesee
Location3.0 Mi E Of N Jct I-75
CarriesI-475
CrossesDetroit ST
Coordinates43.09966, -83.70791

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length111.9 ft (34.1 m)
Max Span45.3 ft (13.8 m)
Deck Width99.7 ft (30.4 m)
Deck Area1036.6 sq m
Main Spans3
Year Built1971

Traffic

Avg Daily Traffic23,600 (2016)
Truck Traffic7%
Lanes On Bridge6
Lanes Under Bridge2

Inspection & Ownership

Last InspectionApril 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000002686

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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