US Bridges

I 84 Wbl over Alkali Cr;alkali CR Gs

Fair

Elmore County, Idaho · 2.8 W. Glenns Ferry · Structure no. 000000000015930

Built
1978
47 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
187 ft
2 main spans
Daily traffic
10,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 84 Wbl over Alkali Cr;alkali CR Gs is a prestressed concrete stringer/multi-beam or girder carrying I 84 Wbl over Alkali Cr;alkali CR Gs in Elmore County, Idaho. It was built in 1978, so it is 47 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 187 ft (57 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
CrossesAlkali Cr;alkali CR Gs
Location2.8 W. Glenns Ferry
RouteInterstate 84
CountyElmore County
StateIdaho
Coordinates42.95775, -115.36453
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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length187 ft (57 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
CarriesHighway
CrossesHighway and waterway
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 Alkali Cr;alkali CR Gs built?

It was built in 1978, making it 47 years old in 2025.

What condition is I 84 Wbl over Alkali Cr;alkali CR Gs 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 May 2023.

How much traffic does I 84 Wbl over Alkali Cr;alkali CR Gs carry?

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

How long is I 84 Wbl over Alkali Cr;alkali CR Gs?

The structure is 187 ft (57 m) long with a longest span of 92 ft (28 m) and a deck 44 ft wide.

Who owns I 84 Wbl over Alkali Cr;alkali CR Gs?

It is owned by the State Highway Agency.