US Bridges

I 184 EB Off Ramp over I 184 EB on Ramp

Fair

Ada County, Idaho · 4.2 W. Boise · Structure no. 000000000019011

Built
2003
22 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
275 ft
3 main spans
Daily traffic
4,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 184 EB Off Ramp over I 184 EB on Ramp is a prestressed concrete box beam or girders - single or spread carrying I 184 EB Off Ramp over I 184 EB on 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 4,000 vehicles a day, projected to reach 6,000 by 2042. The structure is 275 ft (83.8 m) long and 30 ft wide.

Location

Open in Google Maps
CarriesI 184 EB Off Ramp
CrossesI 184 EB on Ramp
Location4.2 W. Boise
RouteInterstate 184
CountyAda County
StateIdaho
Coordinates43.59825, -116.28642
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating74 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 length275 ft (83.8 m)
Longest span130 ft (39.6 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,000 (2023)
Projected traffic6,000 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 184 EB Off Ramp over I 184 EB on Ramp built?

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

What condition is I 184 EB Off Ramp over I 184 EB on 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 2023.

How much traffic does I 184 EB Off Ramp over I 184 EB on Ramp carry?

About 4,000 vehicles per day (2023 count).

How long is I 184 EB Off Ramp over I 184 EB on Ramp?

The structure is 275 ft (83.8 m) long with a longest span of 130 ft (39.6 m) and a deck 30 ft wide.

Who owns I 184 EB Off Ramp over I 184 EB on Ramp?

It is owned by the State Highway Agency.