US Bridges

IH USH51-IH39 NB over Cth Cx

Fair

Marquette County, Wisconsin · 1.3M N JCT Sth 23 to W · Structure no. B39002100000000

Built
1984
41 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
129 ft
3 main spans
Daily traffic
8,900
2022 count
Owner
State
State Highway Agency

About this bridge

IH USH51-IH39 NB over Cth Cx is a concrete continuous slab carrying IH USH51-IH39 NB over Cth Cx in Marquette County, Wisconsin. It was built in 1984, so it is 41 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 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 8,900 vehicles a day, roughly 18% of them trucks, projected to reach 10,680 by 2042. The structure is 129 ft (39.3 m) long and 43 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesIH USH51-IH39 NB
CrossesCth Cx
Location1.3M N JCT Sth 23 to W
RouteInterstate 39
CountyMarquette County
StateWisconsin
Coordinates43.71849, -89.47694
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating32.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length129 ft (39.3 m)
Longest span58 ft (17.7 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,900 (2022)
Projected traffic10,680 by 2042
Trucks18%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IH USH51-IH39 NB over Cth Cx built?

It was built in 1984, making it 41 years old in 2025.

What condition is IH USH51-IH39 NB over Cth Cx 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 2024.

How much traffic does IH USH51-IH39 NB over Cth Cx carry?

About 8,900 vehicles per day (2022 count), of which roughly 18% are trucks.

How long is IH USH51-IH39 NB over Cth Cx?

The structure is 129 ft (39.3 m) long with a longest span of 58 ft (17.7 m) and a deck 43 ft wide.

Who owns IH USH51-IH39 NB over Cth Cx?

It is owned by the State Highway Agency.