US Bridges

4000 North RD over Low Line Canal

Fair

Twin Falls County, Idaho · 1.4 S. 5.4 W. Buhl · Structure no. 000000000025660

Built
1966
59 years old
Condition
Fair
inspected February 2023
Type
Tee Beam
Prestressed Concrete
Length
23 ft
1 main span
Daily traffic
100
2023 count
Owner
Local
Other Local Agency

About this bridge

4000 North RD over Low Line Canal is a prestressed concrete tee beam carrying 4000 North RD over Low Line Canal in Twin Falls County, Idaho. It was built in 1966, so it is 59 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 5 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 150 by 2039. The structure is 23 ft (7 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Carries4000 North RD
CrossesLow Line Canal
Location1.4 S. 5.4 W. Buhl
RouteCounty Highway 0
StateIdaho
Coordinates42.57875, -114.86392
Functional classRural Local

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52 US tons
Inventory rating31 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length23 ft (7 m)
Longest span22 ft (6.7 m)
Deck width28 ft (8.5 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2023)
Projected traffic150 by 2039
Trucks10%
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$298,000 (2019 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 4000 North RD over Low Line Canal built?

It was built in 1966, making it 59 years old in 2025.

What condition is 4000 North RD over Low 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 2023.

How much traffic does 4000 North RD over Low Line Canal carry?

About 100 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is 4000 North RD over Low Line Canal?

The structure is 23 ft (7 m) long with a longest span of 22 ft (6.7 m) and a deck 28 ft wide.

Who owns 4000 North RD over Low Line Canal?

It is owned by the Other Local Agency.