Structure 7086 · Monroe County, MI

Plank RD over Us-23

Carries Plank RD over Us-23, 0.4 Mi S Of Washtenaw Col.

Overall conditionGood

Set by its lowest-rated component: Deck at 8 of 9.

How ratings work
Decksets the rating8/9 · Very Good
Superstructure9/9 · Excellent
Substructure9/9 · Excellent
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT294 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9 · sets the ratingSuperstructure 9/9Substructure 9/9

294 ft end to end, longest span 105 ft: about 4 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.

Built196165 years old
Length294.0 ft89.6 m
Daily traffic770counted 1974
Last inspectedJanuary 2025every 4 months

Location

StateMichigan
CountyMonroe
Location0.4 Mi S Of Washtenaw Col
CarriesPlank RD
CrossesUs-23
Coordinates42.07928, -83.67070

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length294.0 ft (89.6 m)
Max Span105.0 ft (32 m)
Deck Width34.8 ft (10.6 m)
Deck Area949.8 sq m
Main Spans4
Year Built1961

Traffic

Avg Daily Traffic770 (1974)
Lanes On Bridge2
Lanes Under Bridge6

Inspection & Ownership

Last InspectionJanuary 2025
Inspection FrequencyEvery 4 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000007086

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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