Structure 2692 · Genesee County, MI

I-475 Ramp B over I-75

Carries I-475 Ramp B over I-75, N Jct I-75.

Overall conditionPoor

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

How ratings work
Decksets the rating4/9 · Poor
Superstructure5/9 · Fair
Substructure6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT402 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 5/9Substructure 6/9

402 ft end to end, longest span 149 ft: about 6 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 1999
Length401.9 ft122.5 m
Daily traffic11,989counted 2007
Last inspectedJuly 2024every 14 months

Location

StateMichigan
CountyGenesee
LocationN Jct I-75
CarriesI-475 Ramp B
CrossesI-75
Coordinates43.09739, -83.76299

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length401.9 ft (122.5 m)
Max Span149.0 ft (45.4 m)
Deck Width43.6 ft (13.3 m)
Deck Area1629.2 sq m
Main Spans4
Year Built1971 (reconstructed 1999)

Traffic

Avg Daily Traffic11,989 (2007)
Truck Traffic9%
Lanes On Bridge2
Lanes Under Bridge6

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 14 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000002692

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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