Structure 8332 · Oceana County, MI

M-20 Ext over Us-31

Carries M-20 Ext over Us-31, 1.8 Mi W Of New Era.

Overall conditionFair

Set by its lowest-rated component: Deck at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructure7/9 · Good
Substructure7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT347 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 7/9Substructure 7/9

347 ft end to end, longest span 119 ft: about 5 semi-trucks nose to tail. Lengths and the semi-truck 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 multi-beam bridge.

Built197452 years old
Length346.8 ft105.7 m
Daily traffic2,885counted 2007
Last inspectedJuly 2024every 24 months

Location

StateMichigan
CountyOceana
Location1.8 Mi W Of New Era
CarriesM-20 Ext
CrossesUs-31
Coordinates43.55865, -86.39186

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length346.8 ft (105.7 m)
Max Span118.8 ft (36.2 m)
Deck Width49.5 ft (15.1 m)
Deck Area1596.1 sq m
Main Spans3
Year Built1974

Traffic

Avg Daily Traffic2,885 (2007)
Truck Traffic9%
Lanes On Bridge2
Lanes Under Bridge4

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000008332

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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