Structure B53021500000000 · Rock County, WI

IH 39 Nb/ IH 90 WB over Lrd Milwaukee Street

Carries IH 39 Nb/ IH 90 WB over Lrd Milwaukee Street, 2.0m W Jct Sth 11 To E.

Overall conditionGood

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

How ratings work
Deck8/9 · Very Good
Superstructure8/9 · Very Good
Substructuresets the rating7/9 · Good
0 failed4 poor6 fair9 excellent

Elevation

Side view, colored by inspection rating
SEMI-TRUCK · 72 FT151 FT OVERALL25 FT0ELEVATION · LENGTHS TO SCALE
Deck 8/9Superstructure 8/9Substructure 7/9 · sets the rating

151 ft end to end, longest span 73 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 multi-beam bridge.

Built200422 years old
Length150.9 ft46 m
Daily traffic29,500counted 2022
Last inspectedOctober 2024every 48 months

Location

StateWisconsin
CountyRock
Location2.0m W Jct Sth 11 To E
CarriesIH 39 Nb/ IH 90 WB
CrossesLrd Milwaukee Street
Coordinates42.69660, -88.98391

Physical Characteristics

MaterialSteel Continuous
DesignStringer/Multi-beam
Total Length150.9 ft (46 m)
Max Span73.2 ft (22.3 m)
Deck Width74.8 ft (22.8 m)
Deck Area1048.8 sq m
Main Spans3
Year Built2004

Traffic

Avg Daily Traffic29,500 (2022)
Truck Traffic38%
Lanes On Bridge3
Lanes Under Bridge4

Inspection & Ownership

Last InspectionOctober 2024
Inspection FrequencyEvery 48 months
OwnerState Highway Agency
Historical SignificanceBridge is not eligible for the National Register
Scour CriticalNot applicable
Structure NumberB53021500000000

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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