Structure 11081 · Washtenaw County, MI

Island Drive over Traver Creek

Carries Island Drive over Traver Creek, 0.75 Mi E Of Us-23 Br.

Overall conditionGood

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

How ratings work
Deck8/9 · Very Good
Superstructuresets the rating7/9 · Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
24 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 7/9 · sets the ratingSubstructure 7/9 · sets the rating

24 ft end to end. Lengths are drawn to scale; at this length a semi-truck would be a speck. 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 box-beam bridge.

Built1962rebuilt 2021
Length24.0 ft7.3 m
Daily traffic959counted 2016
Last inspectedOctober 2024every 24 months

Location

StateMichigan
CountyWashtenaw
Location0.75 Mi E Of Us-23 Br
CarriesIsland Drive
CrossesTraver Creek
Coordinates42.28910, -83.73156

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length24.0 ft (7.3 m)
Max Span23.0 ft (7 m)
Deck Width42.7 ft (13 m)
Deck Area94.9 sq m
Main Spans1
Year Built1962 (reconstructed 2021)

Traffic

Avg Daily Traffic959 (2016)
Truck Traffic5%
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000011081

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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