US Bridges

US 20 Wbl over S7046;UPRR;SCNCE Ctr Ic

Fair

Bonneville County, Idaho · If; Science Center DR · Structure no. 000000000012350

Built
1970
55 years old
Condition
Fair
inspected May 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
254 ft
4 main spans
Daily traffic
11,750
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 Wbl over S7046;UPRR;SCNCE Ctr Ic is a prestressed concrete stringer/multi-beam or girder carrying US 20 Wbl over S7046;UPRR;SCNCE Ctr Ic in Bonneville County, Idaho. It was built in 1970, so it is 55 years old, older 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 11,750 vehicles a day, roughly 10% of them trucks, projected to reach 17,625 by 2042. The structure is 254 ft (77.4 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS 20 Wbl
CrossesS7046;UPRR;SCNCE Ctr Ic
LocationIf; Science Center DR
RouteU.S. Route 20
CountyBonneville County
StateIdaho
Coordinates43.5154, -112.04009
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2022
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 rating82 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length254 ft (77.4 m)
Longest span75 ft (22.9 m)
Deck width44 ft (13.3 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,750 (2023)
Projected traffic17,625 by 2042
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway and railroad
Detour if closed1.2 mi (2 km)
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 S7046;UPRR;SCNCE Ctr Ic built?

It was built in 1970, making it 55 years old in 2025.

What condition is US 20 Wbl over S7046;UPRR;SCNCE Ctr 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 2022.

How much traffic does US 20 Wbl over S7046;UPRR;SCNCE Ctr Ic carry?

About 11,750 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is US 20 Wbl over S7046;UPRR;SCNCE Ctr Ic?

The structure is 254 ft (77.4 m) long with a longest span of 75 ft (22.9 m) and a deck 44 ft wide.

Who owns US 20 Wbl over S7046;UPRR;SCNCE Ctr Ic?

It is owned by the State Highway Agency.