US Bridges

I 84 EB Off Ramp over Boise River;ramp Ab Br

Fair

Canyon County, Idaho · In Caldwell · Structure no. 000000000016595

Built
1980
45 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
403 ft
4 main spans
Daily traffic
5,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 84 EB Off Ramp over Boise River;ramp Ab Br is a prestressed concrete stringer/multi-beam or girder carrying I 84 EB Off Ramp over Boise River;ramp Ab Br in Canyon County, Idaho. It was built in 1980, so it is 45 years old, younger 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 5,000 vehicles a day, projected to reach 7,500 by 2042. The structure is 403 ft (122.8 m) long and 31 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 84 EB Off Ramp
CrossesBoise River;ramp Ab Br
LocationIn Caldwell
RouteInterstate 84
CountyCanyon County
StateIdaho
Coordinates43.68121, -116.69032
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length403 ft (122.8 m)
Longest span98 ft (29.8 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2023)
Projected traffic7,500 by 2042
Trucks0%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$4.5 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was I 84 EB Off Ramp over Boise River;ramp Ab Br built?

It was built in 1980, making it 45 years old in 2025.

What condition is I 84 EB Off Ramp over Boise River;ramp Ab Br 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 September 2024.

How much traffic does I 84 EB Off Ramp over Boise River;ramp Ab Br carry?

About 5,000 vehicles per day (2023 count).

How long is I 84 EB Off Ramp over Boise River;ramp Ab Br?

The structure is 403 ft (122.8 m) long with a longest span of 98 ft (29.8 m) and a deck 31 ft wide.

Who owns I 84 EB Off Ramp over Boise River;ramp Ab Br?

It is owned by the State Highway Agency.