US Bridges

Lrd Dunbarton RD over Trout Brook

PoorPosted for load

Lafayette County, Wisconsin · 0.1M W JCT Sth 78 · Structure no. P33023100000000

Built
1929
96 years old, rebuilt 1950
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
32 ft
1 main span
Daily traffic
88
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Lrd Dunbarton RD over Trout Brook is a steel stringer/multi-beam or girder carrying Lrd Dunbarton RD over Trout Brook in Lafayette County, Wisconsin. It was built in 1929 and reconstructed in 1950, so it is 96 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 4 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 88 vehicles a day, projected to reach 96 by 2043. The structure is 32 ft (9.7 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

CarriesLrd Dunbarton RD
CrossesTrout Brook
Location0.1M W JCT Sth 78
RouteCity Street 0
Coordinates42.56337, -90.03103
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusPosted for other load-capacity restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28.8 US tons
Inventory rating17.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 10
Structure length32 ft (9.7 m)
Longest span31 ft (9.5 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic88 (2022)
Projected traffic96 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$164,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lrd Dunbarton RD over Trout Brook built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 1950.

What condition is Lrd Dunbarton RD over Trout Brook 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 Lrd Dunbarton RD over Trout Brook carry?

About 88 vehicles per day (2022 count).

How long is Lrd Dunbarton RD over Trout Brook?

The structure is 32 ft (9.7 m) long with a longest span of 31 ft (9.5 m) and a deck 28 ft wide.

Who owns Lrd Dunbarton RD over Trout Brook?

It is owned by the Town or Township Highway Agency.