US Bridges

Cth O over Mill Creek

Poor

Portage County, Wisconsin · 1.0M S JCT Cty P · Structure no. B49006300000000

Built
1975
50 years old
Condition
Poor
inspected August 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
124 ft
2 main spans
Daily traffic
1,250
2023 count
Owner
County
County Highway Agency

About this bridge

Cth O over Mill Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying Cth O over Mill Creek in Portage County, Wisconsin. It was built in 1975, so it is 50 years old, older than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,250 vehicles a day, projected to reach 1,501 by 2042. The structure is 124 ft (37.7 m) long and 38 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCth O
CrossesMill Creek
Location1.0M S JCT Cty P
RouteCounty Highway 0O
CountyPortage County
StateWisconsin
Coordinates44.57569, -89.74728
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
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 rating70.2 US tons
Inventory rating32.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length124 ft (37.7 m)
Longest span61 ft (18.7 m)
Deck width38 ft (11.5 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,250 (2023)
Projected traffic1,501 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$674,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth O over Mill Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is Cth O over Mill Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2023.

How much traffic does Cth O over Mill Creek carry?

About 1,250 vehicles per day (2023 count).

How long is Cth O over Mill Creek?

The structure is 124 ft (37.7 m) long with a longest span of 61 ft (18.7 m) and a deck 38 ft wide.

Who owns Cth O over Mill Creek?

It is owned by the County Highway Agency.