US Bridges

Cth C over Mill Creek

Fair

Portage County, Wisconsin · 2.5M E JCT Cth II · Structure no. B49006000000000

Built
1971
54 years old
Condition
Fair
inspected August 2023
Type
Slab
Concrete Continuous
Length
108 ft
3 main spans
Daily traffic
900
2023 count
Owner
County
County Highway Agency

About this bridge

Cth C over Mill Creek is a concrete continuous slab carrying Cth C over Mill Creek in Portage County, Wisconsin. It was built in 1971, so it is 54 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 900 vehicles a day, projected to reach 720 by 2041. The structure is 108 ft (33 m) long and 37 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesCth C
CrossesMill Creek
Location2.5M E JCT Cth II
RouteCounty Highway 0C
CountyPortage County
StateWisconsin
Coordinates44.51881, -89.66641
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 2023
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 rating59.4 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length108 ft (33 m)
Longest span44 ft (13.4 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic900 (2023)
Projected traffic720 by 2041
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 C over Mill Creek built?

It was built in 1971, making it 54 years old in 2025.

What condition is Cth C 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 August 2023.

How much traffic does Cth C over Mill Creek carry?

About 900 vehicles per day (2023 count).

How long is Cth C over Mill Creek?

The structure is 108 ft (33 m) long with a longest span of 44 ft (13.4 m) and a deck 37 ft wide.

Who owns Cth C over Mill Creek?

It is owned by the County Highway Agency.