US Bridges

STC1853;SWEDEN HWY over Snake River;n.Shelley Br

Fair

Bingham County, Idaho · 2.1 N. Shelley · Structure no. 000000000019325

Built
1984
41 years old
Condition
Fair
inspected October 2024
Type
Tee Beam
Prestressed Concrete Continuous
Length
521 ft
5 main spans
Daily traffic
4,400
2023 count
Owner
County
County Highway Agency

About this bridge

STC1853;SWEDEN HWY over Snake River;n.Shelley Br is a prestressed concrete continuous tee beam carrying STC1853;SWEDEN HWY over Snake River;n.Shelley Br in Bingham 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 4,400 vehicles a day, roughly 9% of them trucks, projected to reach 6,600 by 2042. The structure is 521 ft (158.8 m) long and 40 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesSTC1853;SWEDEN HWY
CrossesSnake River;n.Shelley Br
Location2.1 N. Shelley
RouteCounty Highway 1853
CountyBingham County
StateIdaho
Coordinates43.41147, -112.12325
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating29 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length521 ft (158.8 m)
Longest span102 ft (31.1 m)
Deck width40 ft (12.3 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,400 (2023)
Projected traffic6,600 by 2042
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$6 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was STC1853;SWEDEN HWY over Snake River;n.Shelley Br built?

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

What condition is STC1853;SWEDEN HWY over Snake River;n.Shelley Br 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 2024.

How much traffic does STC1853;SWEDEN HWY over Snake River;n.Shelley Br carry?

About 4,400 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is STC1853;SWEDEN HWY over Snake River;n.Shelley Br?

The structure is 521 ft (158.8 m) long with a longest span of 102 ft (31.1 m) and a deck 40 ft wide.

Who owns STC1853;SWEDEN HWY over Snake River;n.Shelley Br?

It is owned by the County Highway Agency.