Structure 5729 · Lenawee County, MI

N Union Street over Evans Creek

Carries N Union Street over Evans Creek, 283ft N Of Chippewa ST.

Overall conditionPoor

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

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating4/9 · Poor
Channelnot part of overall4/9 · Poor
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT38 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 4/9 · sets the rating

38 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 box-beam bridge.

Built1934rebuilt 1975
Length37.7 ft11.5 m
Daily traffic2,657counted 2007
Last inspectedSeptember 2023every 24 months

Location

StateMichigan
CountyLenawee
Location283ft N Of Chippewa ST
CarriesN Union Street
CrossesEvans Creek
Coordinates42.01044, -83.95028

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length37.7 ft (11.5 m)
Max Span33.8 ft (10.3 m)
Deck Width44.6 ft (13.6 m)
Deck Area156.4 sq m
Main Spans1
Year Built1934 (reconstructed 1975)

Traffic

Avg Daily Traffic2,657 (2007)
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceHistorical significance is not determined
Scour Critical3 — Scour critical
Structure Number000000000005729

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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