Structure 7831 · Oakland County, MI

M-59 EB over Clinton River

Carries M-59 EB over Clinton River, 1.2 Mi E Of I-75.

Overall conditionFair

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

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure8/9 · Very Good
Substructure7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT57 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 7/9

57 ft end to end. 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.

Built1966rebuilt 1999
Length57.1 ft17.4 m
Daily traffic40,528counted 2007
Last inspectedMay 2023every 24 months

Location

StateMichigan
CountyOakland
Location1.2 Mi E Of I-75
CarriesM-59 EB
CrossesClinton River
Coordinates42.64387, -83.21401

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length57.1 ft (17.4 m)
Max Span54.8 ft (16.7 m)
Deck Width88.3 ft (26.9 m)
Deck Area468.1 sq m
Main Spans1
Year Built1966 (reconstructed 1999)

Traffic

Avg Daily Traffic40,528 (2007)
Truck Traffic3%
Lanes On Bridge3

Inspection & Ownership

Last InspectionMay 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical7 — Countermeasures installed
Structure Number000000000007831

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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