US Bridges

US 30B over Portneuf River;in Lava

Fair

Bannock County, Idaho · In Lava Hot Springs · Structure no. 000000000013800

Built
1962
63 years old, rebuilt 2008
Condition
Fair
inspected October 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
2,500
2023 count
Owner
State
State Highway Agency

About this bridge

US 30B over Portneuf River;in Lava is a prestressed concrete stringer/multi-beam or girder carrying US 30B over Portneuf River;in Lava in Bannock County, Idaho. It was built in 1962 and reconstructed in 2008, 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 2,500 vehicles a day, roughly 3% of them trucks, projected to reach 3,750 by 2042. The structure is 44 ft (13.4 m) long and 33 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesUS 30B
CrossesPortneuf River;in Lava
LocationIn Lava Hot Springs
RouteU.S. Route 30
CountyBannock County
StateIdaho
Coordinates42.62022, -112.01208
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81 US tons
Inventory rating49.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHL 93
Structure length44 ft (13.4 m)
Longest span42 ft (12.8 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2023)
Projected traffic3,750 by 2042
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was US 30B over Portneuf River;in Lava built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2008.

What condition is US 30B over Portneuf River;in Lava 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 2021.

How much traffic does US 30B over Portneuf River;in Lava carry?

About 2,500 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is US 30B over Portneuf River;in Lava?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 33 ft wide.

Who owns US 30B over Portneuf River;in Lava?

It is owned by the State Highway Agency.