US Bridges

IH USH51-IH39SB over Sth 66

Fair

Portage County, Wisconsin · 5.9M S JCT Cth X to E · Structure no. B49003000000000

Built
1968
57 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
159 ft
2 main spans
Daily traffic
16,900
2021 count
Owner
State
State Highway Agency

About this bridge

IH USH51-IH39SB over Sth 66 is a prestressed concrete continuous stringer/multi-beam or girder carrying IH USH51-IH39SB over Sth 66 in Portage County, Wisconsin. It was built in 1968, so it is 57 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 16,900 vehicles a day, roughly 16% of them trucks, projected to reach 14,535 by 2043. The structure is 159 ft (48.6 m) long and 42 ft wide.

Location

Open in Google Maps
CarriesIH USH51-IH39SB
CrossesSth 66
Location5.9M S JCT Cth X to E
RouteInterstate 39
CountyPortage County
StateWisconsin
Coordinates44.5408, -89.54477
Functional classUrban 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length159 ft (48.6 m)
Longest span78 ft (23.9 m)
Deck width42 ft (12.8 m)
Roadway width39 ft (11.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic16,900 (2021)
Projected traffic14,535 by 2043
Trucks16%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 USH51-IH39SB over Sth 66 built?

It was built in 1968, making it 57 years old in 2025.

What condition is IH USH51-IH39SB over Sth 66 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 August 2024.

How much traffic does IH USH51-IH39SB over Sth 66 carry?

About 16,900 vehicles per day (2021 count), of which roughly 16% are trucks.

How long is IH USH51-IH39SB over Sth 66?

The structure is 159 ft (48.6 m) long with a longest span of 78 ft (23.9 m) and a deck 42 ft wide.

Who owns IH USH51-IH39SB over Sth 66?

It is owned by the State Highway Agency.