US Bridges

Lrd Silverthorn RD over Br Shullsburg Branch

Fair

Lafayette County, Wisconsin · 1.2M E JCT Cth I · Structure no. P33021900000000

Built
1951
74 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
37 ft
1 main span
Daily traffic
88
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Lrd Silverthorn RD over Br Shullsburg Branch is a steel stringer/multi-beam or girder carrying Lrd Silverthorn RD over Br Shullsburg Branch in Lafayette 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 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 88 vehicles a day, projected to reach 96 by 2043. The structure is 37 ft (11.2 m) long and 18 ft wide. If it were closed, the detour would be 2.5 mi (4 km).

Location

Open in Google Maps
CarriesLrd Silverthorn RD
CrossesBr Shullsburg Branch
Location1.2M E JCT Cth I
RouteCity Street 0
CountyLafayette County
StateWisconsin
Coordinates42.59537, -90.30565
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.
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 inspectionOctober 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating43.2 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length37 ft (11.2 m)
Longest span34 ft (10.5 m)
Deck width18 ft (5.4 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic88 (2022)
Projected traffic96 by 2043
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed2.5 mi (4 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$181,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Lrd Silverthorn RD over Br Shullsburg Branch built?

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

What condition is Lrd Silverthorn RD over Br Shullsburg Branch 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 Silverthorn RD over Br Shullsburg Branch carry?

About 88 vehicles per day (2022 count).

How long is Lrd Silverthorn RD over Br Shullsburg Branch?

The structure is 37 ft (11.2 m) long with a longest span of 34 ft (10.5 m) and a deck 18 ft wide.

Who owns Lrd Silverthorn RD over Br Shullsburg Branch?

It is owned by the Town or Township Highway Agency.