Structure B53035900000000 · Rock County, WI

Sth 59 over IH 39

Carries Sth 59 over IH 39, 2.2 M E Jct Ush 51.

Overall conditionGood

Set by its lowest-rated component: Deck at 7 of 9.

How ratings work
Decksets the rating7/9 · Good
Superstructure8/9 · Very Good
Substructure8/9 · Very Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT209 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 7/9 · sets the ratingSuperstructure 8/9Substructure 8/9

209 ft end to end, longest span 102 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.

Built201610 years old
Length209.0 ft63.7 m
Daily traffic11,700counted 2022
Last inspectedAugust 2024every 48 months

Location

StateWisconsin
CountyRock
Location2.2 M E Jct Ush 51
CarriesSth 59
CrossesIH 39
Coordinates42.83583, -89.02861

Physical Characteristics

MaterialPrestressed Concrete
DesignStringer/Multi-beam
Total Length209.0 ft (63.7 m)
Max Span102.0 ft (31.1 m)
Deck Width73.2 ft (22.3 m)
Deck Area1420.5 sq m
Main Spans2
Year Built2016

Traffic

Avg Daily Traffic11,700 (2022)
Lanes On Bridge2
Lanes Under Bridge6

Inspection & Ownership

Last InspectionAugust 2024
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure NumberB53035900000000

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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