Structure 14561 · Eaton County, MI

I-96 WB over Grand Riv & Billwood HWY

Carries I-96 WB over Grand Riv & Billwood HWY, 2.1 Mi W Of Ingham Co Lin.

Overall conditionGood

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

How ratings work
Deck9/9 · Excellent
Superstructuresets the rating7/9 · Good
Substructure9/9 · Excellent
Channelnot part of overall9/9 · Excellent
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT366 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 9/9Superstructure 7/9 · sets the ratingSubstructure 9/9

366 ft end to end, longest span 122 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.

Built20233 years old
Length366.1 ft111.6 m
Daily traffic47,900counted 2023
Last inspectedJanuary 2024every 19 months

Location

StateMichigan
CountyEaton
Location2.1 Mi W Of Ingham Co Lin
CarriesI-96 WB
CrossesGrand Riv & Billwood HWY
Coordinates42.67030, -84.64500

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length366.1 ft (111.6 m)
Max Span122.4 ft (37.3 m)
Deck Width56.1 ft (17.1 m)
Deck Area1908.4 sq m
Main Spans3
Year Built2023

Traffic

Avg Daily Traffic47,900 (2023)
Truck Traffic13%
Lanes On Bridge2
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJanuary 2024
Inspection FrequencyEvery 19 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number000000000014561

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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