Structure 2648 · Genesee County, MI

I-475 SB over I-75 NB

Carries I-475 SB over I-75 NB, 4.5 Mi S Of Flint.

Overall conditionPoor

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

How ratings work
Decksets the rating4/9 · Poor
Superstructure6/9 · Satisfactory
Substructure6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT188 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9 · sets the ratingSuperstructure 6/9Substructure 6/9

188 ft end to end, longest span 107 ft: about 3 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.

Built197155 years old
Length188.0 ft57.3 m
Daily traffic13,158counted 2007
Last inspectedJanuary 2025every 24 months

Location

StateMichigan
CountyGenesee
Location4.5 Mi S Of Flint
CarriesI-475 SB
CrossesI-75 NB
Coordinates42.92271, -83.68100

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length188.0 ft (57.3 m)
Max Span107.0 ft (32.6 m)
Deck Width43.6 ft (13.3 m)
Deck Area762.1 sq m
Main Spans3
Year Built1971

Traffic

Avg Daily Traffic13,158 (2007)
Truck Traffic8%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJanuary 2025
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000002648

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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