US Bridges

I 15 Nbl & Sbl over Beaver Creek;s.Dubois Br

Fair

Clark County, Idaho · 3.5 S. Dubois · Structure no. 000000000011920

Built
1965
60 years old, rebuilt 1989
Condition
Fair
inspected June 2023
Type
Frame
Concrete
Length
28 ft
1 main span
Daily traffic
3,400
2023 count
Owner
State
State Highway Agency

About this bridge

I 15 Nbl & Sbl over Beaver Creek;s.Dubois Br is a concrete frame carrying I 15 Nbl & Sbl over Beaver Creek;s.Dubois Br in Clark County, Idaho. It was built in 1965 and reconstructed in 1989, so it is 60 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 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 3,400 vehicles a day, roughly 70% of them trucks, projected to reach 5,100 by 2042. The structure is 28 ft (8.5 m) long and 202 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesI 15 Nbl & Sbl
CrossesBeaver Creek;s.Dubois Br
Location3.5 S. Dubois
RouteInterstate 15
CountyClark County
StateIdaho
Coordinates44.12422, -112.23619
Functional classRural 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.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating91.1 US tons
Inventory rating54 US tons

Structure

Structure typeFrame
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length28 ft (8.5 m)
Longest span28 ft (8.5 m)
Deck width202 ft (61.6 m)
Roadway width200 ft (61 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,400 (2023)
Projected traffic5,100 by 2042
Trucks70%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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—
NavigationNo navigation control on waterway

Frequently asked questions

When was I 15 Nbl & Sbl over Beaver Creek;s.Dubois Br built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1989.

What condition is I 15 Nbl & Sbl over Beaver Creek;s.Dubois 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 June 2023.

How much traffic does I 15 Nbl & Sbl over Beaver Creek;s.Dubois Br carry?

About 3,400 vehicles per day (2023 count), of which roughly 70% are trucks.

How long is I 15 Nbl & Sbl over Beaver Creek;s.Dubois Br?

The structure is 28 ft (8.5 m) long with a longest span of 28 ft (8.5 m) and a deck 202 ft wide.

Who owns I 15 Nbl & Sbl over Beaver Creek;s.Dubois Br?

It is owned by the State Highway Agency.