Structure 13307 · Huron County, MI

Union Street over Sebewaing River I/c DR

Carries Union Street over Sebewaing River I/c DR, Sebewaing Village Park.

Overall conditionGood

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

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT78 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

78 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 through truss.

Built200521 years old
Length77.8 ft23.7 m
Daily traffic75counted 2005
Last inspectedSeptember 2023every 24 months

Location

StateMichigan
CountyHuron
LocationSebewaing Village Park
CarriesUnion Street
CrossesSebewaing River I/c DR
Coordinates43.73727, -83.45837

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length77.8 ft (23.7 m)
Max Span71.5 ft (21.8 m)
Deck Width38.1 ft (11.6 m)
Deck Area274.9 sq m
Main Spans1
Year Built2005

Traffic

Avg Daily Traffic75 (2005)
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2023
Inspection FrequencyEvery 24 months
OwnerCity/Municipal Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number000000000013307

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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