US Bridges

I 84B over I 84;NW Caldwell Ic

Fair

Canyon County, Idaho · In Caldwell · Structure no. 000000000012185

Built
1983
42 years old
Condition
Fair
inspected January 2022
Type
Box Beam or Girders - Single or Spread
Steel Continuous
Length
227 ft
3 main spans
Daily traffic
18,000
2023 count
Owner
State
State Highway Agency

About this bridge

I 84B over I 84;NW Caldwell Ic is a steel continuous box beam or girders - single or spread carrying I 84B over I 84;NW Caldwell Ic in Canyon County, Idaho. It was built in 1983, so it is 42 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 18,000 vehicles a day, roughly 7% of them trucks, projected to reach 27,000 by 2042. The structure is 227 ft (69.2 m) long and 84 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI 84B
CrossesI 84;NW Caldwell Ic
LocationIn Caldwell
RouteInterstate 84
CountyCanyon County
StateIdaho
Coordinates43.68, -116.68944
Functional classUrban Other Principal Arterial

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.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2022
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 rating82 US tons
Inventory rating49.1 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length227 ft (69.2 m)
Longest span159 ft (48.5 m)
Deck width84 ft (25.5 m)
Roadway width70 ft (21.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic18,000 (2023)
Projected traffic27,000 by 2042
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
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 84B over I 84;NW Caldwell Ic built?

It was built in 1983, making it 42 years old in 2025.

What condition is I 84B over I 84;NW Caldwell Ic 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 January 2022.

How much traffic does I 84B over I 84;NW Caldwell Ic carry?

About 18,000 vehicles per day (2023 count), of which roughly 7% are trucks.

How long is I 84B over I 84;NW Caldwell Ic?

The structure is 227 ft (69.2 m) long with a longest span of 159 ft (48.5 m) and a deck 84 ft wide.

Who owns I 84B over I 84;NW Caldwell Ic?

It is owned by the State Highway Agency.