Structure 3610 · Huron County, MI

Mcmillan Road over Moore Creek

Carries Mcmillan Road over Moore Creek, Sec 33-34 Hume Twp.

Overall conditionPoor

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

How ratings work
Deck7/9 · Good
Superstructuresets the rating4/9 · Poor
Substructure6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
23 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 4/9 · sets the ratingSubstructure 6/9

23 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 tee-beam bridge.

Built1920rebuilt 1987
Length23.0 ft7 m
Daily traffic180counted 2009
Last inspectedAugust 2024every 12 months

Location

StateMichigan
CountyHuron
LocationSec 33-34 Hume Twp
CarriesMcmillan Road
CrossesMoore Creek
Coordinates43.93768, -83.06483

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length23.0 ft (7 m)
Max Span21.0 ft (6.4 m)
Deck Width28.2 ft (8.6 m)
Deck Area60.2 sq m
Main Spans1
Year Built1920 (reconstructed 1987)

Traffic

Avg Daily Traffic180 (2009)
Truck Traffic1%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number000000000003610

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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