Structure B17095100000000 · Dunn County, WI

Cth Bb over Tainter Lake

Carries Cth Bb over Tainter Lake, 1.7m E Jct Sth 25.

Overall conditionPoor

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

How ratings work
Deck6/9 · Satisfactory
Superstructuresets the rating3/9 · Serious
Substructure5/9 · Fair
Channelnot part of overall7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT431 FT OVERALL50 FT0ELEVATION · LENGTHS TO SCALE
Deck 6/9Superstructure 3/9 · sets the ratingSubstructure 5/9

431 ft end to end, longest span 145 ft: about 6 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 deck truss.

Built193591 years old
Length431.1 ft131.4 m
Daily traffic2,234counted 2024
Last inspectedAugust 2024every 12 months

Location

StateWisconsin
CountyDunn
Location1.7m E Jct Sth 25
CarriesCth Bb
CrossesTainter Lake
Coordinates44.93480, -91.88792

Physical Characteristics

MaterialSteel
DesignTruss - Deck
Total Length431.1 ft (131.4 m)
Max Span145.0 ft (44.2 m)
Deck Width32.2 ft (9.8 m)
Deck Area1287.7 sq m
Main Spans4
Year Built1935

Traffic

Avg Daily Traffic2,234 (2024)
Lanes On Bridge2

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 12 months
OwnerCounty Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour Critical3 — Scour critical
Structure NumberB17095100000000

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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