Structure 6538 · Marquette County, MI

County RD 581 over West Br Escanaba River

Carries County RD 581 over West Br Escanaba River, 9 Mi South Of Greenwood.

Overall conditionPoor

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

How ratings work
Deck5/9 · Fair
Superstructuresets the rating4/9 · Poor
Substructure7/9 · Good
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT31 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9Superstructure 4/9 · sets the ratingSubstructure 7/9

31 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 multi-beam bridge.

Built192898 years old
Length30.8 ft9.4 m
Daily traffic900counted 2001
Last inspectedOctober 2024every 12 months

Location

StateMichigan
CountyMarquette
Location9 Mi South Of Greenwood
CarriesCounty RD 581
CrossesWest Br Escanaba River
Coordinates46.36118, -87.78459

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length30.8 ft (9.4 m)
Max Span28.9 ft (8.8 m)
Deck Width25.3 ft (7.7 m)
Deck Area72.4 sq m
Main Spans1
Year Built1928

Traffic

Avg Daily Traffic900 (2001)
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is on the National Register of Historic Places
Scour Critical3 — Scour critical
Structure Number000000000006538

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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