Structure 8627 · Osceola County, MI

18 Mile RD over Middle Branch River

Carries 18 Mile RD over Middle Branch River, Section 2 T19n R8w.

Overall conditionFair

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

How ratings work
Culvertsets the rating5/9 · Fair
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
20 FT ACROSS25 FT0ELEVATION · LENGTHS TO SCALE
Culvert 5/9

A culvert 20 ft across. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.

Built198046 years old
Length20.0 ft6.1 m
Daily traffic74counted 2017
Last inspectedJuly 2024every 24 months

Location

StateMichigan
CountyOsceola
LocationSection 2 T19n R8w
Carries18 Mile RD
CrossesMiddle Branch River
Coordinates44.07384, -85.24501

Physical Characteristics

MaterialSteel
DesignCulvert
Total Length20.0 ft (6.1 m)
Max Span20.0 ft (6.1 m)
Deck Area59.8 sq m
Main Spans1
Year Built1980

Traffic

Avg Daily Traffic74 (2017)
Truck Traffic32%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJuly 2024
Inspection FrequencyEvery 24 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000008627

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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