Structure 3709 · Ingham County, MI

I-96 Bl over Gtw South ST & Red Cedar

Carries I-96 Bl over Gtw South ST & Red Cedar, In Lansing (s Cedar St).

Overall conditionPoor

Set by its lowest-rated component: Substructure at 4 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructure5/9 · Fair
Substructuresets the rating4/9 · Poor
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT953 FT OVERALL200 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 5/9Substructure 4/9 · sets the rating

953 ft end to end, longest span 84 ft: about 2.6 football fields. 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.

Built1952rebuilt 1997
Length953.1 ft290.5 m
Daily traffic23,865counted 2015
Last inspectedAugust 2024every 12 months

Location

StateMichigan
CountyIngham
LocationIn Lansing (s Cedar St)
CarriesI-96 Bl
CrossesGtw South ST & Red Cedar
Coordinates42.72077, -84.54551

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length953.1 ft (290.5 m)
Max Span83.7 ft (25.5 m)
Deck Width64.3 ft (19.6 m)
Deck Area5693.8 sq m
Main Spans15
Year Built1952 (reconstructed 1997)

Traffic

Avg Daily Traffic23,865 (2015)
Truck Traffic4%
Lanes On Bridge4
Lanes Under Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 12 months
OwnerState Highway Agency
Historical SignificanceBridge is on the National Register of Historic Places
Scour Critical8 — Stable, low risk
Structure Number000000000003709

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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