Structure 7167 · Monroe County, MI

I-75 SB over Plum Creek

Carries I-75 SB over Plum Creek, In Monroe.

Overall conditionFair

Set by its lowest-rated component: Superstructure at 5 of 9.

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating5/9 · Fair
Substructure6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT45 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 5/9 · sets the ratingSubstructure 6/9

45 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.

Built1955rebuilt 1974
Length44.9 ft13.7 m
Daily traffic31,883counted 2007
Last inspectedJune 2023every 24 months

Location

StateMichigan
CountyMonroe
LocationIn Monroe
CarriesI-75 SB
CrossesPlum Creek
Coordinates41.89356, -83.37954

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length44.9 ft (13.7 m)
Max Span44.9 ft (13.7 m)
Deck Width58.4 ft (17.8 m)
Deck Area243.9 sq m
Main Spans1
Year Built1955 (reconstructed 1974)

Traffic

Avg Daily Traffic31,883 (2007)
Truck Traffic23%
Lanes On Bridge3

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number000000000007167

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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