US 20 over North Platte River
FairNatrona County, Wyoming · Casper · Structure no. DEN
- Built
- 1979
- 46 years old
- Condition
- Fair
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 332 ft
- 4 main spans
- Daily traffic
- 12,160
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
US 20 over North Platte River is a steel continuous stringer/multi-beam or girder carrying US 20 over North Platte River in Natrona County, Wyoming. It was built in 1979, so it is 46 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 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 12,160 vehicles a day, roughly 4% of them trucks, projected to reach 17,024 by 2043. The structure is 332 ft (101.1 m) long and 75 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 US 20 over North Platte River built?
It was built in 1979, making it 46 years old in 2025.
What condition is US 20 over North Platte 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 April 2024.
How much traffic does US 20 over North Platte River carry?
About 12,160 vehicles per day (2024 count), of which roughly 4% are trucks.
How long is US 20 over North Platte River?
The structure is 332 ft (101.1 m) long with a longest span of 91 ft (27.7 m) and a deck 75 ft wide.
Who owns US 20 over North Platte River?
It is owned by the State Highway Agency.