US Bridges

STC2729;3400 N. RD over High Line Canal

FairPosted for load

Twin Falls County, Idaho · 2.5 E. US 93;3400N-2650E · Structure no. 000000000019395

Built
1964
61 years old
Condition
Fair
inspected February 2024
Type
Tee Beam
Prestressed Concrete
Length
77 ft
2 main spans
Daily traffic
370
2023 count
Owner
Local
Other Local Agency

About this bridge

STC2729;3400 N. RD over High Line Canal is a prestressed concrete tee beam carrying STC2729;3400 N. RD over High Line Canal in Twin Falls County, Idaho. It was built in 1964, so it is 61 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. Its operating status is: posted for load restriction.

It carries about 370 vehicles a day, roughly 9% of them trucks, projected to reach 555 by 2042. The structure is 77 ft (23.5 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSTC2729;3400 N. RD
CrossesHigh Line Canal
Location2.5 E. US 93;3400N-2650E
RouteCounty Highway 2729
CountyTwin Falls County
StateIdaho
Coordinates42.49139, -114.5275
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating38 US tons
Inventory rating23 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadH 15
Structure length77 ft (23.5 m)
Longest span38 ft (11.6 m)
Deck width28 ft (8.6 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic370 (2023)
Projected traffic555 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$735,000 (2018 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC2729;3400 N. RD over High Line Canal built?

It was built in 1964, making it 61 years old in 2025.

What condition is STC2729;3400 N. RD 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 February 2024.

How much traffic does STC2729;3400 N. RD over High Line Canal carry?

About 370 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is STC2729;3400 N. RD over High Line Canal?

The structure is 77 ft (23.5 m) long with a longest span of 38 ft (11.6 m) and a deck 28 ft wide.

Who owns STC2729;3400 N. RD over High Line Canal?

It is owned by the Other Local Agency.