US Bridges

Sma 7721;RIVERTON over I 15;RIVERTON Road Gs

Fair

Bingham County, Idaho · 1.3 S. Blackfoot · Structure no. 000000000021720

Built
1962
63 years old
Condition
Fair
inspected June 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
254 ft
3 main spans
Daily traffic
910
2023 count
Owner
State
State Highway Agency

About this bridge

Sma 7721;RIVERTON over I 15;RIVERTON Road Gs is a prestressed concrete stringer/multi-beam or girder carrying Sma 7721;RIVERTON over I 15;RIVERTON Road Gs in Bingham County, Idaho. It was built in 1962, so it is 63 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 910 vehicles a day, roughly 5% of them trucks, projected to reach 1,365 by 2042. The structure is 254 ft (77.4 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesSma 7721;RIVERTON
CrossesI 15;RIVERTON Road Gs
Location1.3 S. Blackfoot
RouteCity Street 7721
CountyBingham County
StateIdaho
Coordinates43.18211, -112.37781
Functional classUrban Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3 (+2 approach)
Design loadHS 20
Structure length254 ft (77.4 m)
Longest span50 ft (15.2 m)
Deck width29 ft (8.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic910 (2023)
Projected traffic1,365 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 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$2.1 million (2022 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Sma 7721;RIVERTON over I 15;RIVERTON Road Gs built?

It was built in 1962, making it 63 years old in 2025.

What condition is Sma 7721;RIVERTON over I 15;RIVERTON Road Gs 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 2022.

How much traffic does Sma 7721;RIVERTON over I 15;RIVERTON Road Gs carry?

About 910 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Sma 7721;RIVERTON over I 15;RIVERTON Road Gs?

The structure is 254 ft (77.4 m) long with a longest span of 50 ft (15.2 m) and a deck 29 ft wide.

Who owns Sma 7721;RIVERTON over I 15;RIVERTON Road Gs?

It is owned by the State Highway Agency.