Structure 7994 · Oakland County, MI

Cornell RD over M-39

Carries Cornell RD over M-39, In Southfield.

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
CAR · 15 FT109 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

109 ft end to end, longest span 54 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.

Built1963rebuilt 2000
Length108.6 ft33.1 m
Daily traffic1,500counted 1984
Last inspectedJune 2023every 24 months

Location

StateMichigan
CountyOakland
LocationIn Southfield
CarriesCornell RD
CrossesM-39
Coordinates42.45129, -83.21986

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length108.6 ft (33.1 m)
Max Span54.1 ft (16.5 m)
Deck Width58.7 ft (17.9 m)
Deck Area592.5 sq m
Main Spans2
Year Built1963 (reconstructed 2000)

Traffic

Avg Daily Traffic1,500 (1984)
Truck Traffic3%
Lanes On Bridge3
Lanes Under Bridge6

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000007994

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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