US Bridges

Cth Y over Mill Creek

Fair

Iowa County, Wisconsin · 0.7M S JCT Cth Zz · Structure no. B25002700000000

Built
1982
43 years old
Condition
Fair
inspected July 2024
Type
Slab
Concrete
Length
42 ft
1 main span
Daily traffic
312
2022 count
Owner
County
County Highway Agency

About this bridge

Cth Y over Mill Creek is a concrete slab carrying Cth Y over Mill Creek in Iowa County, Wisconsin. It was built in 1982, so it is 43 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 312 vehicles a day, projected to reach 343 by 2043. The structure is 42 ft (12.8 m) long and 32 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

CarriesCth Y
CrossesMill Creek
Location0.7M S JCT Cth Zz
RouteCounty Highway 0Y
Coordinates43.01539, -90.03458
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50.4 US tons
Inventory rating30.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length42 ft (12.8 m)
Longest span40 ft (12.2 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic312 (2022)
Projected traffic343 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Cth Y over Mill Creek built?

It was built in 1982, making it 43 years old in 2025.

What condition is Cth Y over Mill 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 July 2024.

How much traffic does Cth Y over Mill Creek carry?

About 312 vehicles per day (2022 count).

How long is Cth Y over Mill Creek?

The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 32 ft wide.

Who owns Cth Y over Mill Creek?

It is owned by the County Highway Agency.