US Bridges

East Entrance Road over Yellowstone River

Fair

Teton County, Wyoming · 0.3 Mi. East of Lake Jct. · Structure no. 1570037P0000000

Built
1936
89 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
532 ft
19 main spans
Daily traffic
1,286
2019 count
Owner
Federal
National Park Service

About this bridge

East Entrance Road over Yellowstone River is a wood or timber stringer/multi-beam or girder carrying East Entrance Road over Yellowstone River in Teton County, Wyoming. It was built in 1936, so it is 89 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 1,286 vehicles a day, roughly 15% of them trucks, projected to reach 1,543 by 2039. The structure is 532 ft (162.2 m) long and 43 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesEast Entrance Road
CrossesYellowstone River
Location0.3 Mi. East of Lake Jct.
RouteFederal Lands Road 13
CountyTeton County
StateWyoming
Coordinates44.56622, -110.38125
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans19
Design loadH 15
Structure length532 ft (162.2 m)
Longest span28 ft (8.5 m)
Deck width43 ft (13 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,286 (2019)
Projected traffic1,543 by 2039
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerNational Park Service
Maintained byNational Park Service
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$375,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was East Entrance Road over Yellowstone River built?

It was built in 1936, making it 89 years old in 2025.

What condition is East Entrance Road over Yellowstone 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 September 2024.

How much traffic does East Entrance Road over Yellowstone River carry?

About 1,286 vehicles per day (2019 count), of which roughly 15% are trucks.

How long is East Entrance Road over Yellowstone River?

The structure is 532 ft (162.2 m) long with a longest span of 28 ft (8.5 m) and a deck 43 ft wide.

Who owns East Entrance Road over Yellowstone River?

It is owned by the National Park Service.