US Bridges

Grand Loop Road over Ravine

Fair

Park County, Wyoming · 4.5 Mi. South of Mammoth · Structure no. 1570001P0000000

Built
1977
48 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
327 ft
6 main spans
Daily traffic
1,807
2019 count
Owner
Federal
National Park Service

About this bridge

Grand Loop Road over Ravine is a prestressed concrete continuous stringer/multi-beam or girder carrying Grand Loop Road over Ravine in Park County, Wyoming. It was built in 1977, so it is 48 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 1,807 vehicles a day, roughly 1% of them trucks, projected to reach 2,168 by 2039. The structure is 327 ft (99.7 m) long and 32 ft wide. If it were closed, the detour would be 49.1 mi (79 km).

Location

Open in Google Maps
CarriesGrand Loop Road
CrossesRavine
Location4.5 Mi. South of Mammoth
RouteFederal Lands Road 10
CountyPark County
StateWyoming
Coordinates44.93558, -110.72222
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating51 US tons
Inventory rating30 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadHS 20
Structure length327 ft (99.7 m)
Longest span54 ft (16.6 m)
Deck width32 ft (9.8 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,807 (2019)
Projected traffic2,168 by 2039
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesOther
Detour if closed49.1 mi (79 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 proposedNone recorded
Estimated improvement cost$240,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Grand Loop Road over Ravine built?

It was built in 1977, making it 48 years old in 2025.

What condition is Grand Loop Road over Ravine 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 Grand Loop Road over Ravine carry?

About 1,807 vehicles per day (2019 count), of which roughly 1% are trucks.

How long is Grand Loop Road over Ravine?

The structure is 327 ft (99.7 m) long with a longest span of 54 ft (16.6 m) and a deck 32 ft wide.

Who owns Grand Loop Road over Ravine?

It is owned by the National Park Service.