Structure 6231 · Macomb County, MI

Armada Ridge RD over Coon Creek

Carries Armada Ridge RD over Coon Creek, 0.8 Mi East Of Wolcott RD.

Overall conditionGood

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

How ratings work
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT32 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck not ratedSuperstructure 8/9Substructure 7/9 · sets the rating

32 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 deck arch.

Built198640 years old
Length31.8 ft9.7 m
Daily traffic2,556counted 1997
Last inspectedAugust 2023every 24 months

Location

StateMichigan
CountyMacomb
Location0.8 Mi East Of Wolcott RD
CarriesArmada Ridge RD
CrossesCoon Creek
Coordinates42.81613, -82.92745

Physical Characteristics

MaterialConcrete
DesignArch - Deck
Total Length31.8 ft (9.7 m)
Max Span30.8 ft (9.4 m)
Deck Width49.9 ft (15.2 m)
Deck Area147.4 sq m
Main Spans1
Year Built1986

Traffic

Avg Daily Traffic2,556 (1997)
Truck Traffic3%
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000006231

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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