US Bridges

Cth Mm - Rimrock R over Ush 12/18-W Beltline

Fair

Dane County, Wisconsin · 0.5M S JCT John Nolen · Structure no. B13031000000000

Built
1988
37 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
251 ft
4 main spans
Daily traffic
17,600
2022 count
Owner
State
State Highway Agency

About this bridge

Cth Mm - Rimrock R over Ush 12/18-W Beltline is a steel continuous stringer/multi-beam or girder carrying Cth Mm - Rimrock R over Ush 12/18-W Beltline in Dane County, Wisconsin. It was built in 1988, so it is 37 years old, younger 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 17,600 vehicles a day, projected to reach 23,800 by 2042. The structure is 251 ft (76.4 m) long and 82 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesCth Mm - Rimrock R
CrossesUsh 12/18-W Beltline
Location0.5M S JCT John Nolen
RouteCounty Highway 0MM
CountyDane County
StateWisconsin
Coordinates43.04021, -89.37816
Functional classUrban Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating28.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length251 ft (76.4 m)
Longest span76 ft (23.2 m)
Deck width82 ft (25 m)
Roadway width58 ft (17.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,600 (2022)
Projected traffic23,800 by 2042
Trucks0%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$1.9 million (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Cth Mm - Rimrock R over Ush 12/18-W Beltline built?

It was built in 1988, making it 37 years old in 2025.

What condition is Cth Mm - Rimrock R over Ush 12/18-W Beltline 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 June 2023.

How much traffic does Cth Mm - Rimrock R over Ush 12/18-W Beltline carry?

About 17,600 vehicles per day (2022 count).

How long is Cth Mm - Rimrock R over Ush 12/18-W Beltline?

The structure is 251 ft (76.4 m) long with a longest span of 76 ft (23.2 m) and a deck 82 ft wide.

Who owns Cth Mm - Rimrock R over Ush 12/18-W Beltline?

It is owned by the State Highway Agency.