US Bridges

I 84 Wbl over I 84B;BANNOCK Ic

Fair

Elmore County, Idaho · At Glenns Ferry Ncl · Structure no. 000000000015940

Built
1979
46 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Single or Spread
Concrete Continuous
Length
131 ft
3 main spans
Daily traffic
10,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 84 Wbl over I 84B;BANNOCK Ic is a concrete continuous box beam or girders - single or spread carrying I 84 Wbl over I 84B;BANNOCK Ic in Elmore County, Idaho. It was built in 1979, so it is 46 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 10,000 vehicles a day, roughly 38% of them trucks, projected to reach 15,000 by 2042. The structure is 131 ft (39.9 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI 84 Wbl
CrossesI 84B;BANNOCK Ic
LocationAt Glenns Ferry Ncl
RouteInterstate 84
CountyElmore County
StateIdaho
Coordinates42.96145, -115.30824
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 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 rating34.6 US tons
Inventory rating26.8 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length131 ft (39.9 m)
Longest span92 ft (28 m)
Deck width44 ft (13.3 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,000 (2023)
Projected traffic15,000 by 2042
Trucks38%
Lanes on structure2
Traffic directionOne-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed1.2 mi (2 km)
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 I 84B;BANNOCK Ic built?

It was built in 1979, making it 46 years old in 2025.

What condition is I 84 Wbl over I 84B;BANNOCK 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 August 2023.

How much traffic does I 84 Wbl over I 84B;BANNOCK Ic carry?

About 10,000 vehicles per day (2023 count), of which roughly 38% are trucks.

How long is I 84 Wbl over I 84B;BANNOCK Ic?

The structure is 131 ft (39.9 m) long with a longest span of 92 ft (28 m) and a deck 44 ft wide.

Who owns I 84 Wbl over I 84B;BANNOCK Ic?

It is owned by the State Highway Agency.