Structure 3027 · Gogebic County, MI

Miller Road over Cisco Br Ontonagon River

Carries Miller Road over Cisco Br Ontonagon River, Sec 15 Watersmeet Twp.

Overall conditionPoor

Set by its lowest-rated component: Superstructure at 2 of 9.

How ratings work
Deck4/9 · Poor
Superstructuresets the rating2/9 · Critical
Substructure4/9 · Poor
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
CAR · 15 FT65 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 4/9Superstructure 2/9 · sets the ratingSubstructure 4/9

65 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 through truss.

Built1920106 years old
Length65.0 ft19.8 m
Daily traffic11counted 1998
Last inspectedSeptember 2024every 12 months

Location

StateMichigan
CountyGogebic
LocationSec 15 Watersmeet Twp
CarriesMiller Road
CrossesCisco Br Ontonagon River
Coordinates46.30206, -89.41625

Physical Characteristics

MaterialSteel
DesignTruss - Thru
Total Length65.0 ft (19.8 m)
Max Span64.0 ft (19.5 m)
Deck Width15.4 ft (4.7 m)
Deck Area93.1 sq m
Main Spans1
Year Built1920

Traffic

Avg Daily Traffic11 (1998)
Lanes On Bridge2

Inspection & Ownership

Last InspectionSeptember 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is on the National Register of Historic Places
Scour CriticalUnknown
Structure Number000000000003027

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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