US Bridges

US 89 over Snake River

Fair

Lincoln County, Wyoming · Afton - Alpine JCT · Structure no. BOH

Built
1957
68 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
541 ft
3 main spans
Daily traffic
6,574
2024 count
Owner
State
State Highway Agency

About this bridge

US 89 over Snake River is a steel continuous stringer/multi-beam or girder carrying US 89 over Snake River in Lincoln County, Wyoming. It was built in 1957, so it is 68 years old, older than the Wyoming average of 48.4 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 6,574 vehicles a day, roughly 5% of them trucks, projected to reach 9,204 by 2043. The structure is 541 ft (164.9 m) long and 82 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

CarriesUS 89
CrossesSnake River
LocationAfton - Alpine JCT
RouteU.S. Route 89
StateWyoming
Coordinates43.16679, -111.01738
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating97 US tons
Inventory rating28 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 15
Structure length541 ft (164.9 m)
Longest span264 ft (80.5 m)
Deck width82 ft (25 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,574 (2024)
Projected traffic9,204 by 2043
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$3,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 89 over Snake River built?

It was built in 1957, making it 68 years old in 2025.

What condition is US 89 over Snake River 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 November 2024.

How much traffic does US 89 over Snake River carry?

About 6,574 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is US 89 over Snake River?

The structure is 541 ft (164.9 m) long with a longest span of 264 ft (80.5 m) and a deck 82 ft wide.

Who owns US 89 over Snake River?

It is owned by the State Highway Agency.