Structure 7039 · Missaukee County, MI

13 Mile Road over Butterfield Creek

Carries 13 Mile Road over Butterfield Creek, Section 29/30 T22n R5w.

Overall conditionPoor

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

How ratings work
Decksets the rating3/9 · Serious
Superstructure6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT62 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 3/9 · sets the ratingSuperstructure 6/9Substructure 7/9

62 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 box-beam bridge.

Built198838 years old
Length62.0 ft18.9 m
Daily traffic451counted 2018
Last inspectedMay 2024every 12 months

Location

StateMichigan
CountyMissaukee
LocationSection 29/30 T22n R5w
Carries13 Mile Road
CrossesButterfield Creek
Coordinates44.26937, -84.95326

Physical Characteristics

MaterialPrestressed Concrete
DesignBox Beam - Multiple
Total Length62.0 ft (18.9 m)
Max Span62.0 ft (18.9 m)
Deck Width30.8 ft (9.4 m)
Deck Area177.7 sq m
Main Spans1
Year Built1988

Traffic

Avg Daily Traffic451 (2018)
Truck Traffic10%
Lanes On Bridge2

Inspection & Ownership

Last InspectionMay 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number000000000007039

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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