Structure 8009 · Oakland County, MI

M-24 Conn WB over I-75

Carries M-24 Conn WB over I-75, @ M-24 (m-24 Conn To I-75.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT246 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

246 ft end to end, longest span 89 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.

Built1962rebuilt 2002
Length246.4 ft75.1 m
Daily traffic20,482counted 2007
Last inspectedMarch 2023every 24 months

Location

StateMichigan
CountyOakland
Location@ M-24 (m-24 Conn To I-75
CarriesM-24 Conn WB
CrossesI-75
Coordinates42.69217, -83.25105

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length246.4 ft (75.1 m)
Max Span88.6 ft (27 m)
Deck Width29.2 ft (8.9 m)
Deck Area668.4 sq m
Main Spans4
Year Built1962 (reconstructed 2002)

Traffic

Avg Daily Traffic20,482 (2007)
Truck Traffic2%
Lanes On Bridge1
Lanes Under Bridge9

Inspection & Ownership

Last InspectionMarch 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000008009

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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