Structure 627 · Bay County, MI

I-75 SB over Midland Road

Carries I-75 SB over Midland Road, 3.6 Mi S Of Kawkawlin.

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
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT75 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 8/9Substructure 7/9

75 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.

Built200125 years old
Length75.1 ft22.9 m
Daily traffic18,568counted 2007
Last inspectedDecember 2024every 24 months

Location

StateMichigan
CountyBay
Location3.6 Mi S Of Kawkawlin
CarriesI-75 SB
CrossesMidland Road
Coordinates43.60245, -83.94818

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length75.1 ft (22.9 m)
Max Span73.5 ft (22.4 m)
Deck Width72.5 ft (22.1 m)
Deck Area506.1 sq m
Main Spans1
Year Built2001

Traffic

Avg Daily Traffic18,568 (2007)
Truck Traffic9%
Lanes On Bridge4
Lanes Under Bridge3

Inspection & Ownership

Last InspectionDecember 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000000627

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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