US Bridges

Lrd Oak Park RD over Koshkonong Creek

Fair

Dane County, Wisconsin · 1.4M S JCT Cth Bb · Structure no. B13003200000000

Built
1951
74 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
61 ft
1 main span
Daily traffic
1,600
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Lrd Oak Park RD over Koshkonong Creek is a steel stringer/multi-beam or girder carrying Lrd Oak Park RD over Koshkonong Creek in Dane County, Wisconsin. It was built in 1951, so it is 74 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 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 1,600 vehicles a day, projected to reach 1,920 by 2042. The structure is 61 ft (18.7 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesLrd Oak Park RD
CrossesKoshkonong Creek
Location1.4M S JCT Cth Bb
RouteCity Street 0
CountyDane County
StateWisconsin
Coordinates43.05925, -89.10583
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating32.4 US tons
Inventory rating17.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length61 ft (18.7 m)
Longest span61 ft (18.7 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2022)
Projected traffic1,920 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

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 Oak Park RD over Koshkonong Creek built?

It was built in 1951, making it 74 years old in 2025.

What condition is Lrd Oak Park 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 September 2024.

How much traffic does Lrd Oak Park RD over Koshkonong Creek carry?

About 1,600 vehicles per day (2022 count).

How long is Lrd Oak Park RD over Koshkonong Creek?

The structure is 61 ft (18.7 m) long with a longest span of 61 ft (18.7 m) and a deck 29 ft wide.

Who owns Lrd Oak Park RD over Koshkonong Creek?

It is owned by the Town or Township Highway Agency.