US Bridges

US 93 over High Line Canal

Fair

Twin Falls County, Idaho · 37.6 N. Nevada Line · Structure no. 000000000017570

Built
1956
69 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
78 ft
1 main span
Daily traffic
5,800
2023 count
Owner
State
State Highway Agency

About this bridge

US 93 over High Line Canal is a steel stringer/multi-beam or girder carrying US 93 over High Line Canal in Twin Falls County, Idaho. It was built in 1956, so it is 69 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 5,800 vehicles a day, roughly 35% of them trucks, projected to reach 8,700 by 2042. The structure is 78 ft (23.9 m) long and 36 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesUS 93
CrossesHigh Line Canal
Location37.6 N. Nevada Line
RouteU.S. Route 93
CountyTwin Falls County
StateIdaho
Coordinates42.50569, -114.57478
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2023
Inspection intervalevery 24 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 rating55 US tons
Inventory rating32 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length78 ft (23.9 m)
Longest span75 ft (22.9 m)
Deck width36 ft (11.1 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,800 (2023)
Projected traffic8,700 by 2042
Trucks35%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 93 over High Line Canal built?

It was built in 1956, making it 69 years old in 2025.

What condition is US 93 over High Line 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 November 2023.

How much traffic does US 93 over High Line Canal carry?

About 5,800 vehicles per day (2023 count), of which roughly 35% are trucks.

How long is US 93 over High Line Canal?

The structure is 78 ft (23.9 m) long with a longest span of 75 ft (22.9 m) and a deck 36 ft wide.

Who owns US 93 over High Line Canal?

It is owned by the State Highway Agency.