Structure 5360 · Lapeer County, MI

I-69 EB over Graham Road

Carries I-69 EB over Graham Road, 4.2 Mi SE Of Imlay City.

Overall conditionFair

Set by its lowest-rated component: Deck and Substructure at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT95 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 6/9 · sets the rating

95 ft end to end. 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.

Built197947 years old
Length94.8 ft28.9 m
Daily traffic6,918counted 2007
Last inspectedJanuary 2024every 24 months

Location

StateMichigan
CountyLapeer
Location4.2 Mi SE Of Imlay City
CarriesI-69 EB
CrossesGraham Road
Coordinates42.99496, -83.00690

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length94.8 ft (28.9 m)
Max Span94.8 ft (28.9 m)
Deck Width45.9 ft (14 m)
Deck Area404.6 sq m
Main Spans1
Year Built1979

Traffic

Avg Daily Traffic6,918 (2007)
Truck Traffic24%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000005360

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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