Structure 5123 · Kent County, MI

108th Street over Dorr & Byron Drain

Carries 108th Street over Dorr & Byron Drain, 100 Ft W Of Wustman AVE.

Overall conditionGood

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

How ratings work
Culvertsets the rating7/9 · Good
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT28 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 7/9

A culvert 28 ft across with 2 openings. 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, so those are drawn as typical for a culvert.

Built197749 years old
Length27.9 ft8.5 m
Daily traffic1,139counted 2003
Last inspectedSeptember 2024every 24 months

Location

StateMichigan
CountyKent
Location100 Ft W Of Wustman AVE
Carries108th Street
CrossesDorr & Byron Drain
Coordinates42.76826, -85.73285

Physical Characteristics

MaterialSteel
DesignCulvert
Total Length27.9 ft (8.5 m)
Max Span13.8 ft (4.2 m)
Deck Area51.9 sq m
Main Spans2
Year Built1977

Traffic

Avg Daily Traffic1,139 (2003)
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000005123

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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