US Bridges

Cth Y over Mill Creek

Fair

Iowa County, Wisconsin · 0.6M S JCT Cth H · Structure no. B25004100000000

Built
1976
49 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
337
2022 count
Owner
County
County Highway Agency

About this bridge

Cth Y over Mill Creek is a prestressed concrete box beam or girders - multiple carrying Cth Y over Mill Creek in Iowa County, Wisconsin. It was built in 1976, so it is 49 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 337 vehicles a day, projected to reach 370 by 2043. The structure is 45 ft (13.8 m) long and 33 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

Open in Google Maps
CarriesCth Y
CrossesMill Creek
Location0.6M S JCT Cth H
RouteCounty Highway 0Y
CountyIowa County
StateWisconsin
Coordinates43.04036, -90.01467
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 inspectionJuly 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length45 ft (13.8 m)
Longest span43 ft (13.1 m)
Deck width33 ft (10.1 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic337 (2022)
Projected traffic370 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 1976, making it 49 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 337 vehicles per day (2022 count).

How long is Cth Y over Mill Creek?

The structure is 45 ft (13.8 m) long with a longest span of 43 ft (13.1 m) and a deck 33 ft wide.

Who owns Cth Y over Mill Creek?

It is owned by the County Highway Agency.