Structure 1498 · Cheboygan County, MI

M-33 over Cheboygan River

Carries M-33 over Cheboygan River, 0.4 Mi S Of M-27.

Overall conditionFair

Set by its lowest-rated component: Deck and Superstructure at 6 of 9.

How ratings work
Decksets the rating6/9 · Satisfactory
Superstructuresets the rating6/9 · Satisfactory
Substructure7/9 · Good
Channelnot part of overall5/9 · Fair
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT199 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9 · sets the ratingSuperstructure 6/9 · sets the ratingSubstructure 7/9

199 ft end to end, longest span 70 ft: about 3 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 multi-beam bridge.

Built1958rebuilt 2008
Length199.1 ft60.7 m
Daily traffic6,873counted 2007
Last inspectedJune 2023every 24 months

Location

StateMichigan
CountyCheboygan
Location0.4 Mi S Of M-27
CarriesM-33
CrossesCheboygan River
Coordinates45.59516, -84.47412

Physical Characteristics

MaterialSteel
DesignStringer/Multi-beam
Total Length199.1 ft (60.7 m)
Max Span69.9 ft (21.3 m)
Deck Width37.1 ft (11.3 m)
Deck Area685.9 sq m
Main Spans3
Year Built1958 (reconstructed 2008)

Traffic

Avg Daily Traffic6,873 (2007)
Truck Traffic1%
Lanes On Bridge2

Inspection & Ownership

Last InspectionJune 2023
Inspection FrequencyEvery 24 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical5 — Stable for scour
Structure Number000000000001498

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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