US Bridges

IH USH51-IH39 NB over Cth O

Fair

Marquette County, Wisconsin · 6.7M N JCT Sth 78 to S · Structure no. B39001700000000

Built
1983
42 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete Continuous
Length
116 ft
3 main spans
Daily traffic
15,800
2021 count
Owner
State
State Highway Agency

About this bridge

IH USH51-IH39 NB over Cth O is a concrete continuous slab carrying IH USH51-IH39 NB over Cth O in Marquette County, Wisconsin. It was built in 1983, so it is 42 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 15,800 vehicles a day, roughly 18% of them trucks, projected to reach 18,960 by 2041. The structure is 116 ft (35.4 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 O
Location6.7M N JCT Sth 78 to S
RouteInterstate 39
CountyMarquette County
StateWisconsin
Coordinates43.67134, -89.46972
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 rating57.7 US tons
Inventory rating34 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length116 ft (35.4 m)
Longest span54 ft (16.6 m)
Deck width43 ft (13.1 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,800 (2021)
Projected traffic18,960 by 2041
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 O built?

It was built in 1983, making it 42 years old in 2025.

What condition is IH USH51-IH39 NB over Cth O 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 O carry?

About 15,800 vehicles per day (2021 count), of which roughly 18% are trucks.

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

The structure is 116 ft (35.4 m) long with a longest span of 54 ft (16.6 m) and a deck 43 ft wide.

Who owns IH USH51-IH39 NB over Cth O?

It is owned by the State Highway Agency.