US Bridges

US 30 over Twin Falls Main Canal

Fair

Twin Falls County, Idaho · 8.9 E. Hansen · Structure no. 000000000013656

Built
2011
14 years old
Condition
Fair
inspected March 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
152 ft
2 main spans
Daily traffic
2,900
2023 count
Owner
State
State Highway Agency

About this bridge

US 30 over Twin Falls Main Canal is a prestressed concrete stringer/multi-beam or girder carrying US 30 over Twin Falls Main Canal in Twin Falls 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 2,900 vehicles a day, roughly 20% of them trucks, projected to reach 4,350 by 2042. The structure is 152 ft (46.3 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesUS 30
CrossesTwin Falls Main Canal
Location8.9 E. Hansen
RouteU.S. Route 30
CountyTwin Falls County
StateIdaho
Coordinates42.47508, -114.17433
Functional classRural 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length152 ft (46.3 m)
Longest span74 ft (22.6 m)
Deck width36 ft (10.9 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,900 (2023)
Projected traffic4,350 by 2042
Trucks20%
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

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 Twin Falls Main Canal built?

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

What condition is US 30 over Twin Falls Main Canal 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 March 2022.

How much traffic does US 30 over Twin Falls Main Canal carry?

About 2,900 vehicles per day (2023 count), of which roughly 20% are trucks.

How long is US 30 over Twin Falls Main Canal?

The structure is 152 ft (46.3 m) long with a longest span of 74 ft (22.6 m) and a deck 36 ft wide.

Who owns US 30 over Twin Falls Main Canal?

It is owned by the State Highway Agency.