Structure 2629 · Genesee County, MI

I-75 NB over Cook RD

Carries I-75 NB over Cook RD, 3.0 Mi NW Of Oakland Col.

Overall conditionFair

Set by its lowest-rated component: Superstructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating5/9 · Fair
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT118 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 5/9 · sets the ratingSubstructure 7/9

118 ft end to end, longest span 44 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.

Built1962rebuilt 1985
Length117.8 ft35.9 m
Daily traffic40,700counted 2013
Last inspectedJune 2024every 24 months

Location

StateMichigan
CountyGenesee
Location3.0 Mi NW Of Oakland Col
CarriesI-75 NB
CrossesCook RD
Coordinates42.90273, -83.64703

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length117.8 ft (35.9 m)
Max Span44.0 ft (13.4 m)
Deck Width65.0 ft (19.8 m)
Deck Area710.8 sq m
Main Spans3
Year Built1962 (reconstructed 1985)

Traffic

Avg Daily Traffic40,700 (2013)
Truck Traffic6%
Lanes On Bridge4
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJune 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000002629

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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