Structure 6071 · Macomb County, MI

I-94 Conn NB Grati over 13 Mile RD

Carries I-94 Conn NB Grati over 13 Mile RD, In Roseville (13 Mi Rd).

Overall conditionGood

Set by its lowest-rated component: Deck and Substructure at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT133 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 7/9 · sets the rating

133 ft end to end, longest span 56 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 multi-beam bridge.

Built1964rebuilt 2003
Length133.2 ft40.6 m
Daily traffic17,021counted 2007
Last inspectedJune 2023every 24 months

Location

StateMichigan
CountyMacomb
LocationIn Roseville (13 Mi Rd)
CarriesI-94 Conn NB Grati
Crosses13 Mile RD
Coordinates42.52476, -82.91619

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length133.2 ft (40.6 m)
Max Span56.1 ft (17.1 m)
Deck Width45.6 ft (13.9 m)
Deck Area564.3 sq m
Main Spans3
Year Built1964 (reconstructed 2003)

Traffic

Avg Daily Traffic17,021 (2007)
Truck Traffic4%
Lanes On Bridge1
Lanes Under Bridge4

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure Number000000000006071

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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