US Bridges

Grand Loop Road over Tower Creek

Fair

Teton County, Wyoming · 18.2 Mi. East of Mammoth · Structure no. 1570021P0000000

Built
1935
90 years old
Condition
Fair
inspected September 2024
Type
Arch - Deck
Concrete
Length
40 ft
1 main span
Daily traffic
1,807
2019 count
Owner
Federal
National Park Service

About this bridge

Grand Loop Road over Tower Creek is a concrete arch - deck carrying Grand Loop Road over Tower Creek in Teton County, Wyoming. It was built in 1935, so it is 90 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 1,807 vehicles a day, roughly 1% of them trucks, projected to reach 2,168 by 2039. The structure is 40 ft (12.2 m) long and 39 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesGrand Loop Road
CrossesTower Creek
Location18.2 Mi. East of Mammoth
RouteFederal Lands Road 10
CountyTeton County
StateWyoming
Coordinates44.89242, -110.388
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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating48.9 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width39 ft (12 m)
Roadway width26 ft (7.9 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 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 statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost$105,000 (2022 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Grand Loop Road over Tower Creek built?

It was built in 1935, making it 90 years old in 2025.

What condition is Grand Loop Road over Tower Creek 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 Tower Creek carry?

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

How long is Grand Loop Road over Tower Creek?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 39 ft wide.

Who owns Grand Loop Road over Tower Creek?

It is owned by the National Park Service.