US Bridges

Black Canyon Road over I 84;BLACK Canyon RD Ic

Fair

Payette County, Idaho · 13.1 W. Caldwell · Structure no. 000000000028485

Built
1960
65 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
212 ft
5 main spans
Daily traffic
1,600
2023 count
Owner
State
State Highway Agency

About this bridge

Black Canyon Road over I 84;BLACK Canyon RD Ic is a prestressed concrete stringer/multi-beam or girder carrying Black Canyon Road over I 84;BLACK Canyon RD Ic in Payette County, Idaho. It was built in 1960, so it is 65 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 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 1,600 vehicles a day, roughly 5% of them trucks, projected to reach 2,400 by 2042. The structure is 212 ft (64.6 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesBlack Canyon Road
CrossesI 84;BLACK Canyon RD Ic
Location13.1 W. Caldwell
RouteCounty Highway 0
CountyPayette County
StateIdaho
Coordinates43.86647, -116.77919
Functional classRural Major Collector

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length212 ft (64.6 m)
Longest span49 ft (14.8 m)
Deck width33 ft (10 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,600 (2023)
Projected traffic2,400 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesOverpass structure at an interchange
CrossesHighway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

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$2.6 million (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Black Canyon Road over I 84;BLACK Canyon RD Ic built?

It was built in 1960, making it 65 years old in 2025.

What condition is Black Canyon Road over I 84;BLACK Canyon RD 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 April 2023.

How much traffic does Black Canyon Road over I 84;BLACK Canyon RD Ic carry?

About 1,600 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Black Canyon Road over I 84;BLACK Canyon RD Ic?

The structure is 212 ft (64.6 m) long with a longest span of 49 ft (14.8 m) and a deck 33 ft wide.

Who owns Black Canyon Road over I 84;BLACK Canyon RD Ic?

It is owned by the State Highway Agency.