US Bridges

I 84 Wbl over US 20;N.MOUNTAIN Home Ic

Fair

Elmore County, Idaho · 0.3 N. Mountain Home · Structure no. 000000000015865

Built
1971
54 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
93 ft
1 main span
Daily traffic
10,750
2023 count
Owner
State
State Highway Agency

About this bridge

I 84 Wbl over US 20;N.MOUNTAIN Home Ic is a prestressed concrete stringer/multi-beam or girder carrying I 84 Wbl over US 20;N.MOUNTAIN Home Ic in Elmore County, Idaho. It was built in 1971, so it is 54 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 5 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 10,750 vehicles a day, roughly 27% of them trucks, projected to reach 16,125 by 2042. The structure is 93 ft (28.3 m) long and 41 ft wide.

Location

Open in Google Maps
CarriesI 84 Wbl
CrossesUS 20;N.MOUNTAIN Home Ic
Location0.3 N. Mountain Home
RouteInterstate 84
CountyElmore County
StateIdaho
Coordinates43.13944, -115.66357
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83 US tons
Inventory rating48 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length93 ft (28.3 m)
Longest span89 ft (27 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,750 (2023)
Projected traffic16,125 by 2042
Trucks27%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I 84 Wbl over US 20;N.MOUNTAIN Home Ic built?

It was built in 1971, making it 54 years old in 2025.

What condition is I 84 Wbl over US 20;N.MOUNTAIN Home 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 March 2024.

How much traffic does I 84 Wbl over US 20;N.MOUNTAIN Home Ic carry?

About 10,750 vehicles per day (2023 count), of which roughly 27% are trucks.

How long is I 84 Wbl over US 20;N.MOUNTAIN Home Ic?

The structure is 93 ft (28.3 m) long with a longest span of 89 ft (27 m) and a deck 41 ft wide.

Who owns I 84 Wbl over US 20;N.MOUNTAIN Home Ic?

It is owned by the State Highway Agency.