US Bridges

Ush 18 over Koshkonong Creek

Fair

Jefferson County, Wisconsin · 0.5M E JCT Sth 134 · Structure no. B28010500000000

Built
2000
25 years old
Condition
Fair
inspected January 2025
Type
Slab
Concrete Continuous
Length
75 ft
2 main spans
Daily traffic
4,700
2022 count
Owner
State
State Highway Agency

About this bridge

Ush 18 over Koshkonong Creek is a concrete continuous slab carrying Ush 18 over Koshkonong Creek in Jefferson County, Wisconsin. It was built in 2000, so it is 25 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 4,700 vehicles a day, roughly 10% of them trucks, projected to reach 5,640 by 2042. The structure is 75 ft (22.8 m) long and 62 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesUsh 18
CrossesKoshkonong Creek
Location0.5M E JCT Sth 134
RouteU.S. Route 18
CountyJefferson County
StateWisconsin
Coordinates43.00873, -89.01279
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
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 rating86.4 US tons
Inventory rating51.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length75 ft (22.8 m)
Longest span36 ft (11 m)
Deck width62 ft (18.9 m)
Roadway width51 ft (15.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,700 (2022)
Projected traffic5,640 by 2042
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Ush 18 over Koshkonong Creek built?

It was built in 2000, making it 25 years old in 2025.

What condition is Ush 18 over Koshkonong 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 January 2025.

How much traffic does Ush 18 over Koshkonong Creek carry?

About 4,700 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is Ush 18 over Koshkonong Creek?

The structure is 75 ft (22.8 m) long with a longest span of 36 ft (11 m) and a deck 62 ft wide.

Who owns Ush 18 over Koshkonong Creek?

It is owned by the State Highway Agency.