US Bridges

I 84 Wbl over Snake River;king Hill

Fair

Elmore County, Idaho · 7.4 E. Glenns Ferry · Structure no. 000000000015985

Built
1974
51 years old, rebuilt 1989
Condition
Fair
inspected August 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
998 ft
5 main spans
Daily traffic
9,750
2023 count
Owner
State
State Highway Agency

About this bridge

I 84 Wbl over Snake River;king Hill is a steel continuous girder and floorbeam system carrying I 84 Wbl over Snake River;king Hill in Elmore County, Idaho. It was built in 1974 and reconstructed in 1989, so it is 51 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 9,750 vehicles a day, roughly 28% of them trucks, projected to reach 14,625 by 2042. The structure is 998 ft (304.2 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 84 Wbl
CrossesSnake River;king Hill
Location7.4 E. Glenns Ferry
RouteInterstate 84
CountyElmore County
StateIdaho
Coordinates42.9552, -115.16509
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length998 ft (304.2 m)
Longest span260 ft (79.2 m)
Deck width44 ft (13.3 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,750 (2023)
Projected traffic14,625 by 2042
Trucks28%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 84 Wbl over Snake River;king Hill built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 1989.

What condition is I 84 Wbl over Snake River;king Hill 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 Snake River;king Hill carry?

About 9,750 vehicles per day (2023 count), of which roughly 28% are trucks.

How long is I 84 Wbl over Snake River;king Hill?

The structure is 998 ft (304.2 m) long with a longest span of 260 ft (79.2 m) and a deck 44 ft wide.

Who owns I 84 Wbl over Snake River;king Hill?

It is owned by the State Highway Agency.