US Bridges

US 20 Wbl over SH43;EIRR;W Belt Brdg Ic

Fair

Bonneville County, Idaho · Near Ucon · Structure no. 000000000012405

Built
1986
39 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
235 ft
4 main spans
Daily traffic
17,750
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 Wbl over SH43;EIRR;W Belt Brdg Ic is a prestressed concrete stringer/multi-beam or girder carrying US 20 Wbl over SH43;EIRR;W Belt Brdg Ic in Bonneville County, Idaho. It was built in 1986, so it is 39 years old, younger than the Idaho average of 45.3 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 17,750 vehicles a day, roughly 7% of them trucks, projected to reach 26,625 by 2042. The structure is 235 ft (71.6 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesUS 20 Wbl
CrossesSH43;EIRR;W Belt Brdg Ic
LocationNear Ucon
RouteU.S. Route 20
CountyBonneville County
StateIdaho
Coordinates43.59344, -111.97003
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating54 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length235 ft (71.6 m)
Longest span73 ft (22.3 m)
Deck width44 ft (13.3 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic17,750 (2023)
Projected traffic26,625 by 2042
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed—
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was US 20 Wbl over SH43;EIRR;W Belt Brdg Ic built?

It was built in 1986, making it 39 years old in 2025.

What condition is US 20 Wbl over SH43;EIRR;W Belt Brdg Ic 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 May 2023.

How much traffic does US 20 Wbl over SH43;EIRR;W Belt Brdg Ic carry?

About 17,750 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is US 20 Wbl over SH43;EIRR;W Belt Brdg Ic?

The structure is 235 ft (71.6 m) long with a longest span of 73 ft (22.3 m) and a deck 44 ft wide.

Who owns US 20 Wbl over SH43;EIRR;W Belt Brdg Ic?

It is owned by the State Highway Agency.