Structure 8022 · Oakland County, MI

M-15 over I-75

Carries M-15 over I-75, @ M-15.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT196 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

196 ft end to end, longest span 98 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 box-beam bridge.

Built200521 years old
Length196.2 ft59.8 m
Daily traffic22,892counted 2007
Last inspectedDecember 2024every 15 months

Location

StateMichigan
CountyOakland
Location@ M-15
CarriesM-15
CrossesI-75
Coordinates42.74640, -83.41952

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length196.2 ft (59.8 m)
Max Span98.1 ft (29.9 m)
Deck Width90.9 ft (27.7 m)
Deck Area1656.5 sq m
Main Spans2
Year Built2005

Traffic

Avg Daily Traffic22,892 (2007)
Truck Traffic2%
Lanes On Bridge4
Lanes Under Bridge8

Inspection & Ownership

Last InspectionDecember 2024
Inspection FrequencyEvery 15 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000008022

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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