US Bridges

US 26 over S.Fk.Snake R;swan Val.Br

Fair

Bonneville County, Idaho · 3.3 W. Swan Valley · Structure no. 000000000013285

Built
1981
44 years old
Condition
Fair
inspected September 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
783 ft
8 main spans
Daily traffic
5,300
2023 count
Owner
State
State Highway Agency

About this bridge

US 26 over S.Fk.Snake R;swan Val.Br is a prestressed concrete stringer/multi-beam or girder carrying US 26 over S.Fk.Snake R;swan Val.Br in Bonneville County, Idaho. It was built in 1981, so it is 44 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 6 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 5,300 vehicles a day, roughly 17% of them trucks, projected to reach 7,950 by 2042. The structure is 783 ft (238.7 m) long and 47 ft wide. If it were closed, the detour would be 60.3 mi (97 km).

Location

Open in Google Maps
CarriesUS 26
CrossesS.Fk.Snake R;swan Val.Br
Location3.3 W. Swan Valley
RouteU.S. Route 26
CountyBonneville County
StateIdaho
Coordinates43.45019, -111.39978
Functional classRural Principal Arterial - Other

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 inspectionSeptember 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating98 US tons
Inventory rating56 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans8
Design loadHS 25 or greater
Structure length783 ft (238.7 m)
Longest span97 ft (29.6 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,300 (2023)
Projected traffic7,950 by 2042
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed60.3 mi (97 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$9.4 million (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was US 26 over S.Fk.Snake R;swan Val.Br built?

It was built in 1981, making it 44 years old in 2025.

What condition is US 26 over S.Fk.Snake R;swan Val.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 September 2021.

How much traffic does US 26 over S.Fk.Snake R;swan Val.Br carry?

About 5,300 vehicles per day (2023 count), of which roughly 17% are trucks.

How long is US 26 over S.Fk.Snake R;swan Val.Br?

The structure is 783 ft (238.7 m) long with a longest span of 97 ft (29.6 m) and a deck 47 ft wide.

Who owns US 26 over S.Fk.Snake R;swan Val.Br?

It is owned by the State Highway Agency.