Structure 9718 · Schoolcraft County, MI

Cookson Road over Manistique River

Carries Cookson Road over Manistique River, Sec 28 Doyle Twp.

Overall conditionFair

Set by its lowest-rated component: Substructure at 6 of 9.

How ratings work
Deck7/9 · Good
Superstructure7/9 · Good
Substructuresets the rating6/9 · Satisfactory
Channelnot part of overall6/9 · Satisfactory
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT150 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9Superstructure 7/9Substructure 6/9 · sets the rating

150 ft end to end, longest span 54 ft: about 2 semi-trucks nose to tail. 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 slab bridge.

Built199630 years old
Length149.9 ft45.7 m
Daily traffic48counted 2013
Last inspectedOctober 2024every 24 months

Location

StateMichigan
CountySchoolcraft
LocationSec 28 Doyle Twp
CarriesCookson Road
CrossesManistique River
Coordinates46.08608, -86.05981

Physical Characteristics

MaterialWood or Timber
DesignSlab
Total Length149.9 ft (45.7 m)
Max Span54.1 ft (16.5 m)
Deck Width26.2 ft (8 m)
Deck Area365.6 sq m
Main Spans3
Year Built1996

Traffic

Avg Daily Traffic48 (2013)
Lanes On Bridge2

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 24 months
OwnerOther State Agencies
Historical SignificanceBridge is not eligible for the National Register
Scour Critical8 — Stable, low risk
Structure Number000000000009718

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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