US Bridges

Cth Mn over Door Creek

PoorPosted for load

Dane County, Wisconsin · 2.7M S JCT Ush 12 · Structure no. B13095300000000

Built
1921
104 years old, rebuilt 1958
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
34 ft
1 main span
Daily traffic
2,600
2022 count
Owner
County
County Highway Agency

About this bridge

Cth Mn over Door Creek is a concrete stringer/multi-beam or girder carrying Cth Mn over Door Creek in Dane County, Wisconsin. It was built in 1921 and reconstructed in 1958, so it is 104 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 3 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. Its operating status is: posted for other load-capacity restriction.

It carries about 2,600 vehicles a day, projected to reach 3,120 by 2042. The structure is 34 ft (10.4 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesCth Mn
CrossesDoor Creek
Location2.7M S JCT Ush 12
RouteCounty Highway 0MN
Coordinates43.01286, -89.23669
Functional classRural Local

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.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for other load-capacity restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.6 US tons
Inventory rating19.6 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length34 ft (10.4 m)
Longest span31 ft (9.3 m)
Deck width37 ft (11.4 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,600 (2022)
Projected traffic3,120 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$238,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth Mn over Door Creek built?

It was built in 1921, making it 104 years old in 2025. It was reconstructed in 1958.

What condition is Cth Mn over Door 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 September 2024.

How much traffic does Cth Mn over Door Creek carry?

About 2,600 vehicles per day (2022 count).

How long is Cth Mn over Door Creek?

The structure is 34 ft (10.4 m) long with a longest span of 31 ft (9.3 m) and a deck 37 ft wide.

Who owns Cth Mn over Door Creek?

It is owned by the County Highway Agency.