Structure 9738 · Shiawassee County, MI

I-69 EB over Webb Drain

Carries I-69 EB over Webb Drain, 2.7 Mi SW Of Genesee Col.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT64 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 7/9

64 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.

Built196165 years old
Length64.0 ft19.5 m
Daily traffic14,378counted 2007
Last inspectedAugust 2023every 24 months

Location

StateMichigan
CountyShiawassee
Location2.7 Mi SW Of Genesee Col
CarriesI-69 EB
CrossesWebb Drain
Coordinates42.95599, -83.96921

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length64.0 ft (19.5 m)
Max Span64.0 ft (19.5 m)
Deck Width46.9 ft (14.3 m)
Deck Area278.9 sq m
Main Spans1
Year Built1961

Traffic

Avg Daily Traffic14,378 (2007)
Truck Traffic20%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number000000000009738

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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