Structure 11840 · Wayne County, MI

Davison To I-75 Rp over Gtwrr I-75&DAVISON(M-8)

Carries Davison To I-75 Rp over Gtwrr I-75&DAVISON(M-8), In Detroit.

Overall conditionGood

Set by its lowest-rated component: Substructure at 7 of 9.

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT1,071 FT OVERALL200 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 7/9 · sets the rating

1,071 ft end to end, longest span 186 ft: about 3.0 football fields. 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.

Built1971rebuilt 2021
Length1071.2 ft326.5 m
Daily traffic5,930counted 2020
Last inspectedApril 2023every 24 months

Location

StateMichigan
CountyWayne
LocationIn Detroit
CarriesDavison To I-75 Rp
CrossesGtwrr I-75&DAVISON(M-8)
Coordinates42.40927, -83.07975

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length1071.2 ft (326.5 m)
Max Span186.0 ft (56.7 m)
Deck Width30.8 ft (9.4 m)
Deck Area3069.1 sq m
Main Spans9
Year Built1971 (reconstructed 2021)

Traffic

Avg Daily Traffic5,930 (2020)
Truck Traffic4%
Lanes On Bridge1
Lanes Under Bridge9

Inspection & Ownership

Last InspectionApril 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000011840

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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