US Bridges

IH 41 SB over Cth N

Fair

Fond du Lac County, Wisconsin · 1.7M S JCT Cth P · Structure no. B20011800000000

Built
1999
26 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
232 ft
2 main spans
Daily traffic
21,450
2023 count
Owner
State
State Highway Agency

About this bridge

IH 41 SB over Cth N is a prestressed concrete stringer/multi-beam or girder carrying IH 41 SB over Cth N in Fond du Lac County, Wisconsin. It was built in 1999, so it is 26 years old, younger 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 6 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 21,450 vehicles a day, roughly 10% of them trucks, projected to reach 29,895 by 2042. The structure is 232 ft (70.7 m) long and 47 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

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CarriesIH 41 SB
CrossesCth N
Location1.7M S JCT Cth P
RouteInterstate 41
CountyFond du Lac County
StateWisconsin
Coordinates43.8507, -88.57202
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.6 US tons
Inventory rating41.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length232 ft (70.7 m)
Longest span113 ft (34.4 m)
Deck width47 ft (14.3 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,450 (2023)
Projected traffic29,895 by 2042
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed7.5 mi (12 km)
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.4 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was IH 41 SB over Cth N built?

It was built in 1999, making it 26 years old in 2025.

What condition is IH 41 SB over Cth N 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 April 2023.

How much traffic does IH 41 SB over Cth N carry?

About 21,450 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is IH 41 SB over Cth N?

The structure is 232 ft (70.7 m) long with a longest span of 113 ft (34.4 m) and a deck 47 ft wide.

Who owns IH 41 SB over Cth N?

It is owned by the State Highway Agency.