US Bridges

US 30 over UPRR & Canal; Topaz Op

Fair

Bannock County, Idaho · 5.8 W. Lava Hot Springs · Structure no. 000000000013706

Built
2011
14 years old
Condition
Fair
inspected October 2021
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
613 ft
3 main spans
Daily traffic
5,700
2023 count
Owner
State
State Highway Agency

About this bridge

US 30 over UPRR & Canal; Topaz Op is a steel continuous stringer/multi-beam or girder carrying US 30 over UPRR & Canal; Topaz Op in Bannock County, Idaho. It was built in 2011, so it is 14 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 5,700 vehicles a day, roughly 24% of them trucks, projected to reach 8,550 by 2042. The structure is 613 ft (186.8 m) long and 82 ft wide. If it were closed, the detour would be 42.3 mi (68 km).

Location

Open in Google Maps
CarriesUS 30
CrossesUPRR & Canal; Topaz Op
Location5.8 W. Lava Hot Springs
RouteU.S. Route 30
CountyBannock County
StateIdaho
Coordinates42.62347, -112.11869
Functional classRural Principal Arterial - Other

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.
Substructure8 Very GoodNo problems noted.
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 geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89 US tons
Inventory rating53 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length613 ft (186.8 m)
Longest span320 ft (97.5 m)
Deck width82 ft (25 m)
Roadway width79 ft (24.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,700 (2023)
Projected traffic8,550 by 2042
Trucks24%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed42.3 mi (68 km)
TollOn a free road
National Highway SystemYes

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 30 over UPRR & Canal; Topaz Op built?

It was built in 2011, making it 14 years old in 2025.

What condition is US 30 over UPRR & Canal; Topaz Op 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 30 over UPRR & Canal; Topaz Op carry?

About 5,700 vehicles per day (2023 count), of which roughly 24% are trucks.

How long is US 30 over UPRR & Canal; Topaz Op?

The structure is 613 ft (186.8 m) long with a longest span of 320 ft (97.5 m) and a deck 82 ft wide.

Who owns US 30 over UPRR & Canal; Topaz Op?

It is owned by the State Highway Agency.