US Bridges

Sth 30 EB over Lrd Thompson Road

Fair

Dane County, Wisconsin · 1.0M E JCT Ush 51 to N · Structure no. B13020300000000

Built
1961
64 years old, rebuilt 1996
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
157 ft
3 main spans
Daily traffic
20,950
2022 count
Owner
State
State Highway Agency

About this bridge

Sth 30 EB over Lrd Thompson Road is a prestressed concrete stringer/multi-beam or girder carrying Sth 30 EB over Lrd Thompson Road in Dane County, Wisconsin. It was built in 1961 and reconstructed in 1996, so it is 64 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 20,950 vehicles a day, roughly 3% of them trucks, projected to reach 25,140 by 2042. The structure is 157 ft (47.8 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesSth 30 EB
CrossesLrd Thompson Road
Location1.0M E JCT Ush 51 to N
RouteState Highway 30
CountyDane County
StateWisconsin
Coordinates43.10557, -89.30084
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.3 US tons
Inventory rating42.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length157 ft (47.8 m)
Longest span76 ft (23.3 m)
Deck width35 ft (10.8 m)
Roadway width31 ft (9.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,950 (2022)
Projected traffic25,140 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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$973,000 (2024 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sth 30 EB over Lrd Thompson Road built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1996.

What condition is Sth 30 EB over Lrd Thompson Road 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 April 2023.

How much traffic does Sth 30 EB over Lrd Thompson Road carry?

About 20,950 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Sth 30 EB over Lrd Thompson Road?

The structure is 157 ft (47.8 m) long with a longest span of 76 ft (23.3 m) and a deck 35 ft wide.

Who owns Sth 30 EB over Lrd Thompson Road?

It is owned by the State Highway Agency.