US Bridges

Stc 1850; Riverton over Blackfoot River

Fair

Bingham County, Idaho · 4.1 S 6.6 W Blackfoot · Structure no. 000000000019291

Built
2006
19 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
74 ft
1 main span
Daily traffic
110
2023 count
Owner
County
County Highway Agency

About this bridge

Stc 1850; Riverton over Blackfoot River is a steel stringer/multi-beam or girder carrying Stc 1850; Riverton over Blackfoot River in Bingham County, Idaho. It was built in 2006, so it is 19 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 110 vehicles a day, roughly 22% of them trucks, projected to reach 165 by 2042. The structure is 74 ft (22.6 m) long and 37 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

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CarriesStc 1850; Riverton
CrossesBlackfoot River
Location4.1 S 6.6 W Blackfoot
RouteCounty Highway 1850
CountyBingham County
StateIdaho
Coordinates43.1305, -112.47681
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating99.9 US tons
Inventory rating67 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length74 ft (22.6 m)
Longest span69 ft (21 m)
Deck width37 ft (11.4 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2023)
Projected traffic165 by 2042
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Stc 1850; Riverton over Blackfoot River built?

It was built in 2006, making it 19 years old in 2025.

What condition is Stc 1850; Riverton 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 October 2024.

How much traffic does Stc 1850; Riverton over Blackfoot River carry?

About 110 vehicles per day (2023 count), of which roughly 22% are trucks.

How long is Stc 1850; Riverton over Blackfoot River?

The structure is 74 ft (22.6 m) long with a longest span of 69 ft (21 m) and a deck 37 ft wide.

Who owns Stc 1850; Riverton over Blackfoot River?

It is owned by the County Highway Agency.