US 34 Business over South Platte River
FairWeld County, Colorado · 2.9 MI E of JCT US 85-C · Structure no. C-18-J
- Built
- 1961
- 64 years old
- Condition
- Fair
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 819 ft
- 14 main spans
- Daily traffic
- 1,600
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
US 34 Business over South Platte River is a prestressed concrete stringer/multi-beam or girder carrying US 34 Business over South Platte River in Weld County, Colorado. It was built in 1961, so it is 64 years old, older than the Colorado average of 42.2 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 1,600 vehicles a day, roughly 12% of them trucks, projected to reach 2,016 by 2040. The structure is 819 ft (249.5 m) long and 34 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US 34 Business over South Platte River built?
It was built in 1961, making it 64 years old in 2025.
What condition is US 34 Business over South 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 November 2023.
How much traffic does US 34 Business over South Platte River carry?
About 1,600 vehicles per day (2020 count), of which roughly 12% are trucks.
How long is US 34 Business over South Platte River?
The structure is 819 ft (249.5 m) long with a longest span of 57 ft (17.3 m) and a deck 34 ft wide.
Who owns US 34 Business over South Platte River?
It is owned by the State Highway Agency.