Structure 13153 · Kent County, MI

60th Street over Pratt Lake Drain

Carries 60th Street over Pratt Lake Drain, 0.4 Mi W Of Alden Nash Av.

Overall conditionGood

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

How ratings work
Culvertsets the rating7/9 · Good
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT27 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 7/9

A culvert 27 ft across with 3 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.

Built198541 years old
Length26.9 ft8.2 m
Daily traffic1,700counted 2000
Last inspectedNovember 2023every 24 months

Location

StateMichigan
CountyKent
Location0.4 Mi W Of Alden Nash Av
Carries60th Street
CrossesPratt Lake Drain
Coordinates42.85652, -85.37844

Physical Characteristics

MaterialSteel
DesignCulvert
Total Length26.9 ft (8.2 m)
Max Span8.5 ft (2.6 m)
Deck Area54.9 sq m
Main Spans3
Year Built1985

Traffic

Avg Daily Traffic1,700 (2000)
Lanes On Bridge2

Inspection & Ownership

Last InspectionNovember 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000013153

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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