US Bridges

STC2704;LILLY Gr. over Salmon Falls Creek

Fair

Twin Falls County, Idaho · 4.7 S. 0.1 E. Castleford · Structure no. 000000000019345

Built
1984
41 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
110
2023 count
Owner
Local
Other Local Agency

About this bridge

STC2704;LILLY Gr. over Salmon Falls Creek is a steel stringer/multi-beam or girder carrying STC2704;LILLY Gr. over Salmon Falls Creek in Twin Falls County, Idaho. It was built in 1984, so it is 41 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 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 110 vehicles a day, roughly 57% of them trucks, projected to reach 165 by 2042. The structure is 40 ft (12.2 m) long and 28 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

Location

Open in Google Maps
CarriesSTC2704;LILLY Gr.
CrossesSalmon Falls Creek
Location4.7 S. 0.1 E. Castleford
RouteCounty Highway 2704
CountyTwin Falls County
StateIdaho
Coordinates42.45267, -114.86297
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 alignment8: Equal to present desirable criteria
Operating rating60 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2023)
Projected traffic165 by 2042
Trucks57%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed19.3 mi (31 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 STC2704;LILLY Gr. over Salmon Falls Creek built?

It was built in 1984, making it 41 years old in 2025.

What condition is STC2704;LILLY Gr. over Salmon Falls Creek 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 October 2023.

How much traffic does STC2704;LILLY Gr. over Salmon Falls Creek carry?

About 110 vehicles per day (2023 count), of which roughly 57% are trucks.

How long is STC2704;LILLY Gr. over Salmon Falls Creek?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 28 ft wide.

Who owns STC2704;LILLY Gr. over Salmon Falls Creek?

It is owned by the Other Local Agency.