US Bridges

I 84 WB on Ramp over I 84 WB Off Ramp

Fair

Ada County, Idaho · 4.5 W. Boise · Structure no. 000000000019013

Built
2003
22 years old
Condition
Fair
inspected April 2021
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
330 ft
3 main spans
Daily traffic
6,800
2023 count
Owner
State
State Highway Agency

About this bridge

I 84 WB on Ramp over I 84 WB Off Ramp is a prestressed concrete box beam or girders - single or spread carrying I 84 WB on Ramp over I 84 WB Off Ramp in Ada County, Idaho. It was built in 2003, so it is 22 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 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 6,800 vehicles a day, projected to reach 10,200 by 2042. The structure is 330 ft (100.6 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 84 WB on Ramp
CrossesI 84 WB Off Ramp
Location4.5 W. Boise
RouteInterstate 84
CountyAda County
StateIdaho
Coordinates43.59375, -116.28033
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionApril 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66 US tons
Inventory rating24 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length330 ft (100.6 m)
Longest span155 ft (47.2 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,800 (2023)
Projected traffic10,200 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I 84 WB on Ramp over I 84 WB Off Ramp built?

It was built in 2003, making it 22 years old in 2025.

What condition is I 84 WB on Ramp over I 84 WB Off Ramp 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 April 2021.

How much traffic does I 84 WB on Ramp over I 84 WB Off Ramp carry?

About 6,800 vehicles per day (2023 count).

How long is I 84 WB on Ramp over I 84 WB Off Ramp?

The structure is 330 ft (100.6 m) long with a longest span of 155 ft (47.2 m) and a deck 30 ft wide.

Who owns I 84 WB on Ramp over I 84 WB Off Ramp?

It is owned by the State Highway Agency.