US Bridges

IH 43 NB over Cnw RR

Fair

Rock County, Wisconsin · 4.8M N JCT IH 90 to W · Structure no. B53011100000000

Built
1975
50 years old
Condition
Fair
inspected March 2023
Type
Slab
Concrete Continuous
Length
164 ft
3 main spans
Daily traffic
8,700
2022 count
Owner
State
State Highway Agency

About this bridge

IH 43 NB over Cnw RR is a concrete continuous slab carrying IH 43 NB over Cnw RR in Rock County, Wisconsin. It was built in 1975, so it is 50 years old, older than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 8,700 vehicles a day, roughly 10% of them trucks, projected to reach 10,440 by 2039. The structure is 164 ft (50 m) long and 43 ft wide.

Location

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CarriesIH 43 NB
CrossesCnw RR
Location4.8M N JCT IH 90 to W
RouteInterstate 43
CountyRock County
StateWisconsin
Coordinates42.56978, -88.90078
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length164 ft (50 m)
Longest span63 ft (19.2 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,700 (2022)
Projected traffic10,440 by 2039
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IH 43 NB over Cnw RR built?

It was built in 1975, making it 50 years old in 2025.

What condition is IH 43 NB over Cnw RR in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in March 2023.

How much traffic does IH 43 NB over Cnw RR carry?

About 8,700 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is IH 43 NB over Cnw RR?

The structure is 164 ft (50 m) long with a longest span of 63 ft (19.2 m) and a deck 43 ft wide.

Who owns IH 43 NB over Cnw RR?

It is owned by the State Highway Agency.