Structure 3694 · Ingham County, MI

M-143 E Mich AVE over Museum Drive

Carries M-143 E Mich AVE over Museum Drive, 0.3 Mi E Of The Capitol.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT39 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 6/9 · sets the ratingSubstructure 7/9

39 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.

Built198739 years old
Length38.7 ft11.8 m
Daily traffic8,882counted 2007
Last inspectedJuly 2024every 24 months

Location

StateMichigan
CountyIngham
Location0.3 Mi E Of The Capitol
CarriesM-143 E Mich AVE
CrossesMuseum Drive
Coordinates42.73363, -84.54805

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length38.7 ft (11.8 m)
Max Span36.7 ft (11.2 m)
Deck Width117.1 ft (35.7 m)
Deck Area421.3 sq m
Main Spans1
Year Built1987

Traffic

Avg Daily Traffic8,882 (2007)
Truck Traffic3%
Lanes On Bridge5
Lanes Under Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000003694

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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