Structure 2976 · Gogebic County, MI

Old County Road over Black River

Carries Old County Road over Black River, Sec 13 Bessemer Twp.

Overall conditionPoor

Set by its lowest-rated component: Deck and Superstructure at 3 of 9.

How ratings work
Decksets the rating3/9 · Serious
Superstructuresets the rating3/9 · Serious
Substructure5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT130 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 3/9 · sets the ratingSuperstructure 3/9 · sets the ratingSubstructure 5/9

130 ft end to end, longest span 50 ft. 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 girder bridge.

Built1922104 years old
Length129.9 ft39.6 m
Daily traffic391counted 1998
Last inspectedSeptember 2024every 12 months

Location

StateMichigan
CountyGogebic
LocationSec 13 Bessemer Twp
CarriesOld County Road
CrossesBlack River
Coordinates46.47396, -90.00164

Physical Characteristics

MaterialConcrete
DesignGirder and Floorbeam
Total Length129.9 ft (39.6 m)
Max Span49.9 ft (15.2 m)
Deck Width26.9 ft (8.2 m)
Deck Area324.7 sq m
Main Spans3
Year Built1922

Traffic

Avg Daily Traffic391 (1998)
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is on the National Register of Historic Places
Scour CriticalUnknown
Structure Number000000000002976

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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