US Bridges

U.S. Route 89 over Buffalo Fork

Fair

Teton County, Wyoming · 0.2 Miles South of Moran · Structure no. 1460004P0000000

Built
1956
69 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
241 ft
4 main spans
Daily traffic
3,100
2023 count
Owner
Federal
National Park Service

About this bridge

U.S. Route 89 over Buffalo Fork is a steel continuous stringer/multi-beam or girder carrying U.S. Route 89 over Buffalo Fork in Teton County, Wyoming. It was built in 1956, so it is 69 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 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 3,100 vehicles a day, roughly 1% of them trucks, projected to reach 3,410 by 2043. The structure is 241 ft (73.5 m) long and 37 ft wide. If it were closed, the detour would be 75.2 mi (121 km).

Location

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CarriesU.S. Route 89
CrossesBuffalo Fork
Location0.2 Miles South of Moran
RouteFederal Lands Road 10
CountyTeton County
StateWyoming
Coordinates43.83846, -110.51258
Functional classRural Minor 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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating29 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length241 ft (73.5 m)
Longest span67 ft (20.4 m)
Deck width37 ft (11.3 m)
Roadway width33 ft (10.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,100 (2023)
Projected traffic3,410 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed75.2 mi (121 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$338,000
NavigationNo navigation control on waterway

Frequently asked questions

When was U.S. Route 89 over Buffalo Fork built?

It was built in 1956, making it 69 years old in 2025.

What condition is U.S. Route 89 over Buffalo Fork 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 2023.

How much traffic does U.S. Route 89 over Buffalo Fork carry?

About 3,100 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is U.S. Route 89 over Buffalo Fork?

The structure is 241 ft (73.5 m) long with a longest span of 67 ft (20.4 m) and a deck 37 ft wide.

Who owns U.S. Route 89 over Buffalo Fork?

It is owned by the National Park Service.