Structure 3544 · Huron County, MI

Pinnebog Road over E. Br. Pinnebog River

Carries Pinnebog Road over E. Br. Pinnebog River, Sec. 19-20 Meade Twp..

Overall conditionFair

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

How ratings work
Decksets the rating5/9 · Fair
Superstructure7/9 · Good
Substructure6/9 · Satisfactory
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT60 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 5/9 · sets the ratingSuperstructure 7/9Substructure 6/9

60 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 tee-beam bridge.

Built197650 years old
Length59.7 ft18.2 m
Daily traffic1,390counted 2009
Last inspectedAugust 2023every 24 months

Location

StateMichigan
CountyHuron
LocationSec. 19-20 Meade Twp.
CarriesPinnebog Road
CrossesE. Br. Pinnebog River
Coordinates43.88131, -83.10240

Physical Characteristics

MaterialPrestressed Concrete
DesignTee Beam
Total Length59.7 ft (18.2 m)
Max Span56.8 ft (17.3 m)
Deck Width36.1 ft (11 m)
Deck Area200.2 sq m
Main Spans1
Year Built1976

Traffic

Avg Daily Traffic1,390 (2009)
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2023
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure Number000000000003544

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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