US Bridges

Sth 40-MAIN ST over Eighteen Mile Creek

Fair

Dunn County, Wisconsin · 2.2M N JCT Cth B · Structure no. B17098400000000

Built
1934
91 years old, rebuilt 1989
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
77 ft
1 main span
Daily traffic
4,000
2023 count
Owner
State
State Highway Agency

About this bridge

Sth 40-MAIN ST over Eighteen Mile Creek is a steel stringer/multi-beam or girder carrying Sth 40-MAIN ST over Eighteen Mile Creek in Dunn County, Wisconsin. It was built in 1934 and reconstructed in 1989, so it is 91 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 4,000 vehicles a day, roughly 6% of them trucks, projected to reach 5,290 by 2043. The structure is 77 ft (23.6 m) long and 40 ft wide. If it were closed, the detour would be 21.7 mi (35 km).

Location

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CarriesSth 40-MAIN ST
CrossesEighteen Mile Creek
Location2.2M N JCT Cth B
RouteState Highway 40
CountyDunn County
StateWisconsin
Coordinates45.00048, -91.72666
Functional classRural Minor Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39.6 US tons
Inventory rating23.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length77 ft (23.6 m)
Longest span73 ft (22.3 m)
Deck width40 ft (12.2 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2023)
Projected traffic5,290 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed21.7 mi (35 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Sth 40-MAIN ST over Eighteen Mile Creek built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1989.

What condition is Sth 40-MAIN ST over Eighteen Mile Creek 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 Sth 40-MAIN ST over Eighteen Mile Creek carry?

About 4,000 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is Sth 40-MAIN ST over Eighteen Mile Creek?

The structure is 77 ft (23.6 m) long with a longest span of 73 ft (22.3 m) and a deck 40 ft wide.

Who owns Sth 40-MAIN ST over Eighteen Mile Creek?

It is owned by the State Highway Agency.