Structure 8087 · Oakland County, MI

I-75 NB over Old M-59 (auburn Rd)

Carries I-75 NB over Old M-59 (auburn Rd), 0.5 Mi S Of M-59.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT133 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

133 ft end to end, longest span 63 ft. 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.

Built1964rebuilt 2001
Length132.9 ft40.5 m
Daily traffic70,877counted 2007
Last inspectedJuly 2023every 24 months

Location

StateMichigan
CountyOakland
Location0.5 Mi S Of M-59
CarriesI-75 NB
CrossesOld M-59 (auburn Rd)
Coordinates42.63452, -83.23847

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length132.9 ft (40.5 m)
Max Span62.7 ft (19.1 m)
Deck Width98.4 ft (30 m)
Deck Area1,215 sq m
Main Spans3
Year Built1964 (reconstructed 2001)

Traffic

Avg Daily Traffic70,877 (2007)
Truck Traffic6%
Lanes On Bridge5
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJuly 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000008087

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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