Structure 90702000032013 · Gogebic County, MI

Fdr8100 over So Br Presque Isle River

Carries Fdr8100 over So Br Presque Isle River, 6 Mi S Of Marenisco.

Overall conditionFair

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

How ratings work
Deck7/9 · Good
Superstructure9/9 · Excellent
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT105 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 9/9Substructure 6/9 · sets the rating

105 ft end to end, longest span 43 ft. 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.

Built20215 years old
Length105.0 ft32 m
Daily traffic20counted 2021
Last inspectedAugust 2024every 24 months

Location

StateMichigan
CountyGogebic
Location6 Mi S Of Marenisco
CarriesFdr8100
CrossesSo Br Presque Isle River
Coordinates46.30720, -89.74008

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length105.0 ft (32 m)
Max Span42.7 ft (13 m)
Deck Width27.2 ft (8.3 m)
Deck Area265.6 sq m
Main Spans3
Year Built2021

Traffic

Avg Daily Traffic20 (2021)
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 24 months
OwnerU.S. Forest Service
Historical SignificanceHistorical significance is not determined
Scour Critical8 — Stable, low risk
Structure Number090702000032013

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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