Structure 11674 · Wayne County, MI

M-39 NB Serv RD over Rouge River

Carries M-39 NB Serv RD over Rouge River, In Dearborn.

Overall conditionFair

Set by its lowest-rated component: Deck at 5 of 9.

How ratings work
Decksets the rating5/9 · Fair
Superstructure6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT340 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 6/9Substructure 7/9

340 ft end to end, longest span 90 ft: about 5 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.

Built196363 years old
Length339.9 ft103.6 m
Daily traffic19,480counted 1982
Last inspectedOctober 2023every 24 months

Location

StateMichigan
CountyWayne
LocationIn Dearborn
CarriesM-39 NB Serv RD
CrossesRouge River
Coordinates42.30751, -83.21414

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length339.9 ft (103.6 m)
Max Span89.9 ft (27.4 m)
Deck Width39.4 ft (12 m)
Deck Area1243.2 sq m
Main Spans5
Year Built1963

Traffic

Avg Daily Traffic19,480 (1982)
Truck Traffic3%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000011674

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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