US Bridges

STC2745;3700 North over Twin Falls Main Canal

Fair

Twin Falls County, Idaho · 2.8 N. 1.5 W. Murtaugh · Structure no. 000000000019480

Built
1971
54 years old
Condition
Fair
inspected February 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
204 ft
3 main spans
Daily traffic
920
2023 count
Owner
Local
Other Local Agency

About this bridge

STC2745;3700 North over Twin Falls Main Canal is a steel continuous stringer/multi-beam or girder carrying STC2745;3700 North over Twin Falls Main Canal in Twin Falls County, Idaho. It was built in 1971, so it is 54 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 920 vehicles a day, roughly 6% of them trucks, projected to reach 1,380 by 2042. The structure is 204 ft (62.2 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSTC2745;3700 North
CrossesTwin Falls Main Canal
Location2.8 N. 1.5 W. Murtaugh
RouteCounty Highway 2745
CountyTwin Falls County
StateIdaho
Coordinates42.53308, -114.19803
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.
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
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating75 US tons
Inventory rating44 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length204 ft (62.2 m)
Longest span77 ft (23.5 m)
Deck width32 ft (9.7 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic920 (2023)
Projected traffic1,380 by 2042
Trucks6%
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was STC2745;3700 North over Twin Falls Main Canal built?

It was built in 1971, making it 54 years old in 2025.

What condition is STC2745;3700 North 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 February 2023.

How much traffic does STC2745;3700 North over Twin Falls Main Canal carry?

About 920 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is STC2745;3700 North over Twin Falls Main Canal?

The structure is 204 ft (62.2 m) long with a longest span of 77 ft (23.5 m) and a deck 32 ft wide.

Who owns STC2745;3700 North over Twin Falls Main Canal?

It is owned by the Other Local Agency.