US Bridges

Northeast Entrance over Lamar River

Fair

Park County, Wyoming · 5.3 Mi. East of Tower JCT · Structure no. 1570074P0000000

Built
2012
13 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
420 ft
3 main spans
Daily traffic
2,000
2019 count
Owner
Federal
National Park Service

About this bridge

Northeast Entrance over Lamar River is a steel continuous stringer/multi-beam or girder carrying Northeast Entrance over Lamar River in Park County, Wyoming. It was built in 2012, so it is 13 years old, younger 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 2,000 vehicles a day, roughly 1% of them trucks, projected to reach 2,400 by 2039. The structure is 420 ft (128 m) long and 33 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesNortheast Entrance
CrossesLamar River
Location5.3 Mi. East of Tower JCT
RouteFederal Lands Road 12
CountyPark County
StateWyoming
Coordinates44.91528, -110.32283
Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53 US tons
Inventory rating31 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length420 ft (128 m)
Longest span165 ft (50.3 m)
Deck width33 ft (10.2 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,000 (2019)
Projected traffic2,400 by 2039
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$188,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Northeast Entrance over Lamar River built?

It was built in 2012, making it 13 years old in 2025.

What condition is Northeast Entrance over Lamar 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 Northeast Entrance over Lamar River carry?

About 2,000 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is Northeast Entrance over Lamar River?

The structure is 420 ft (128 m) long with a longest span of 165 ft (50.3 m) and a deck 33 ft wide.

Who owns Northeast Entrance over Lamar River?

It is owned by the National Park Service.