Structure 10814 · Washtenaw County, MI

Us-12 over Ann Arbor Rr

Carries Us-12 over Ann Arbor Rr, 3.4 Mi NE Of Saline.

Overall conditionFair

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

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

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT141 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

141 ft end to end, longest span 47 ft. 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.

Built1924rebuilt 1979
Length140.7 ft42.9 m
Daily traffic23,822counted 2007
Last inspectedJanuary 2025every 19 months

Location

StateMichigan
CountyWashtenaw
Location3.4 Mi NE Of Saline
CarriesUs-12
CrossesAnn Arbor Rr
Coordinates42.19216, -83.72267

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length140.7 ft (42.9 m)
Max Span46.9 ft (14.3 m)
Deck Width59.7 ft (18.2 m)
Deck Area780.8 sq m
Main Spans3
Year Built1924 (reconstructed 1979)

Traffic

Avg Daily Traffic23,822 (2007)
Truck Traffic5%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJanuary 2025
Inspection FrequencyEvery 19 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000010814

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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