US Bridges

Lrd Ridge RD over Koshkonong Creek

Fair

Dane County, Wisconsin · 1.0M S JCT Cth Bb · Structure no. B13035400000000

Built
1985
40 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
42 ft
1 main span
Daily traffic
294
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Lrd Ridge RD over Koshkonong Creek is a concrete slab carrying Lrd Ridge RD over Koshkonong Creek in Dane County, Wisconsin. It was built in 1985, so it is 40 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 6 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 294 vehicles a day, projected to reach 323 by 2043. The structure is 42 ft (12.8 m) long and 28 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

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CarriesLrd Ridge RD
CrossesKoshkonong Creek
Location1.0M S JCT Cth Bb
RouteCity Street 0
CountyDane County
StateWisconsin
Coordinates43.06714, -89.15994
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.2 US tons
Inventory rating35.7 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length42 ft (12.8 m)
Longest span40 ft (12.2 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic294 (2022)
Projected traffic323 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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 Lrd Ridge RD over Koshkonong Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is Lrd Ridge RD over Koshkonong 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 October 2024.

How much traffic does Lrd Ridge RD over Koshkonong Creek carry?

About 294 vehicles per day (2022 count).

How long is Lrd Ridge RD over Koshkonong Creek?

The structure is 42 ft (12.8 m) long with a longest span of 40 ft (12.2 m) and a deck 28 ft wide.

Who owns Lrd Ridge RD over Koshkonong Creek?

It is owned by the Town or Township Highway Agency.