Grand Loop Road over Gardner River
FairPark County, Wyoming · 1.6 Mi. Southeast of Mamm · Structure no. 1570023P0000000
- Built
- 1939
- 86 years old, rebuilt 1977
- Condition
- Fair
- inspected September 2024
- Type
- Truss - Deck
- Steel
- Length
- 962 ft
- 4 main spans
- Daily traffic
- 4,350
- 2024 count
- Owner
- Federal
- National Park Service
About this bridge
Grand Loop Road over Gardner River is a steel truss - deck carrying Grand Loop Road over Gardner River in Park County, Wyoming. It was built in 1939 and reconstructed in 1977, so it is 86 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 4,350 vehicles a day, roughly 1% of them trucks, projected to reach 5,200 by 2044. The structure is 962 ft (293.2 m) long and 28 ft wide. If it were closed, the detour would be 52.2 mi (84 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Grand Loop Road over Gardner River built?
It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1977.
What condition is Grand Loop Road over Gardner 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 Grand Loop Road over Gardner River carry?
About 4,350 vehicles per day (2024 count), of which roughly 1% are trucks.
How long is Grand Loop Road over Gardner River?
The structure is 962 ft (293.2 m) long with a longest span of 207 ft (63.1 m) and a deck 28 ft wide.
Who owns Grand Loop Road over Gardner River?
It is owned by the National Park Service.