US Bridges

Cth Z over Blue Mounds Creek

Fair

Dane County, Wisconsin · 0.7M N JCT Cth E · Structure no. P13010700000000

Built
1979
46 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete
Length
28 ft
1 main span
Daily traffic
107
2022 count
Owner
County
County Highway Agency

About this bridge

Cth Z over Blue Mounds Creek is a concrete slab carrying Cth Z over Blue Mounds Creek in Dane County, Wisconsin. It was built in 1979, so it is 46 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 107 vehicles a day, projected to reach 117 by 2043. The structure is 28 ft (8.5 m) long and 33 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

Location

Open in Google Maps
CarriesCth Z
CrossesBlue Mounds Creek
Location0.7M N JCT Cth E
RouteCounty Highway 0Z
CountyDane County
StateWisconsin
Coordinates42.94186, -89.82931
Functional classRural Minor 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 alignment6: Equal to present minimum criteria
Operating rating77.4 US tons
Inventory rating46.4 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span25 ft (7.6 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic107 (2022)
Projected traffic117 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 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 Z over Blue Mounds Creek built?

It was built in 1979, making it 46 years old in 2025.

What condition is Cth Z over Blue Mounds 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 September 2024.

How much traffic does Cth Z over Blue Mounds Creek carry?

About 107 vehicles per day (2022 count).

How long is Cth Z over Blue Mounds Creek?

The structure is 28 ft (8.5 m) long with a longest span of 25 ft (7.6 m) and a deck 33 ft wide.

Who owns Cth Z over Blue Mounds Creek?

It is owned by the County Highway Agency.