US Bridges

US 20 Wbl over US 20B;LEWISVILLE RD Ic

Good

Bonneville County, Idaho · Id Falls;lewisville HWY · Structure no. 000000000012360

Built
1987
38 years old
Condition
Good
inspected May 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
187 ft
3 main spans
Daily traffic
11,750
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 Wbl over US 20B;LEWISVILLE RD Ic is a prestressed concrete continuous stringer/multi-beam or girder carrying US 20 Wbl over US 20B;LEWISVILLE RD Ic in Bonneville County, Idaho. It was built in 1987, so it is 38 years old, younger than the Idaho average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,750 vehicles a day, roughly 10% of them trucks, projected to reach 17,625 by 2042. The structure is 187 ft (57 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesUS 20 Wbl
CrossesUS 20B;LEWISVILLE RD Ic
LocationId Falls;lewisville HWY
RouteU.S. Route 20
CountyBonneville County
StateIdaho
Coordinates43.52741, -112.02327
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length187 ft (57 m)
Longest span108 ft (32.9 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
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 US 20B;LEWISVILLE RD Ic built?

It was built in 1987, making it 38 years old in 2025.

What condition is US 20 Wbl over US 20B;LEWISVILLE RD Ic in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2022.

How much traffic does US 20 Wbl over US 20B;LEWISVILLE RD Ic carry?

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

How long is US 20 Wbl over US 20B;LEWISVILLE RD Ic?

The structure is 187 ft (57 m) long with a longest span of 108 ft (32.9 m) and a deck 44 ft wide.

Who owns US 20 Wbl over US 20B;LEWISVILLE RD Ic?

It is owned by the State Highway Agency.