US Bridges

Diamond Creed Road over Blackfoot River

Fair

Caribou County, Idaho · 10.4 S. 2.5 E. Wayan · Structure no. 000000000023305

Built
1971
54 years old
Condition
Fair
inspected September 2024
Type
Slab
Prestressed Concrete
Length
43 ft
1 main span
Daily traffic
55
2023 count
Owner
County
County Highway Agency

About this bridge

Diamond Creed Road over Blackfoot River is a prestressed concrete slab carrying Diamond Creed Road over Blackfoot River in Caribou County, Idaho. It was built in 1971, so it is 54 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 55 vehicles a day, roughly 10% of them trucks, projected to reach 83 by 2039. The structure is 43 ft (13.1 m) long and 16 ft wide. If it were closed, the detour would be 31.7 mi (51 km).

Location

Open in Google Maps
CarriesDiamond Creed Road
CrossesBlackfoot River
Location10.4 S. 2.5 E. Wayan
RouteCounty Highway 0
CountyCaribou County
StateIdaho
Coordinates42.824, -111.32333
Functional classRural Local

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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span42 ft (12.8 m)
Deck width16 ft (4.8 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic55 (2023)
Projected traffic83 by 2039
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed31.7 mi (51 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$450,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Diamond Creed Road over Blackfoot River built?

It was built in 1971, making it 54 years old in 2025.

What condition is Diamond Creed Road over Blackfoot River 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 September 2024.

How much traffic does Diamond Creed Road over Blackfoot River carry?

About 55 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Diamond Creed Road over Blackfoot River?

The structure is 43 ft (13.1 m) long with a longest span of 42 ft (12.8 m) and a deck 16 ft wide.

Who owns Diamond Creed Road over Blackfoot River?

It is owned by the County Highway Agency.