US Bridges

US 20 Wbl over Menan-Lorenzo RD Ic

Good

Jefferson County, Idaho · 4.2 N. Rigby · Structure no. 000000000012489

Built
2011
14 years old
Condition
Good
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
102 ft
1 main span
Daily traffic
9,750
2023 count
Owner
State
State Highway Agency

About this bridge

US 20 Wbl over Menan-Lorenzo RD Ic is a prestressed concrete stringer/multi-beam or girder carrying US 20 Wbl over Menan-Lorenzo RD Ic in Jefferson County, Idaho. It was built in 2011, so it is 14 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 9,750 vehicles a day, roughly 13% of them trucks, projected to reach 14,625 by 2042. The structure is 102 ft (31.1 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesUS 20 Wbl
CrossesMenan-Lorenzo RD Ic
Location4.2 N. Rigby
RouteU.S. Route 20
CountyJefferson County
StateIdaho
Coordinates43.72478, -111.87486
Functional classRural Principal Arterial - Other

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating39 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length102 ft (31.1 m)
Longest span97 ft (29.6 m)
Deck width44 ft (13.4 m)
Roadway width41 ft (12.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,750 (2023)
Projected traffic14,625 by 2042
Trucks13%
Lanes on structure2
Traffic directionOne-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 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 Menan-Lorenzo RD Ic built?

It was built in 2011, making it 14 years old in 2025.

What condition is US 20 Wbl over Menan-Lorenzo 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 September 2023.

How much traffic does US 20 Wbl over Menan-Lorenzo RD Ic carry?

About 9,750 vehicles per day (2023 count), of which roughly 13% are trucks.

How long is US 20 Wbl over Menan-Lorenzo RD Ic?

The structure is 102 ft (31.1 m) long with a longest span of 97 ft (29.6 m) and a deck 44 ft wide.

Who owns US 20 Wbl over Menan-Lorenzo RD Ic?

It is owned by the State Highway Agency.