County Road 3 over Big Thompson River
FairLarimer County, Colorado · 1.2 MI N of CO RD 18 · Structure no. LR3-1.2-18
- Built
- 1983
- 42 years old
- Condition
- Fair
- inspected June 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 62 ft
- 1 main span
- Daily traffic
- 1,943
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
County Road 3 over Big Thompson River is a prestressed concrete tee beam carrying County Road 3 over Big Thompson River in Larimer County, Colorado. It was built in 1983, so it is 42 years old, younger 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 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 1,943 vehicles a day, roughly 26% of them trucks, projected to reach 2,429 by 2042. The structure is 62 ft (18.9 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was County Road 3 over Big Thompson River built?
It was built in 1983, making it 42 years old in 2025.
What condition is County Road 3 over Big Thompson 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 June 2023.
How much traffic does County Road 3 over Big Thompson River carry?
About 1,943 vehicles per day (2023 count), of which roughly 26% are trucks.
How long is County Road 3 over Big Thompson River?
The structure is 62 ft (18.9 m) long with a longest span of 59 ft (18 m) and a deck 25 ft wide.
Who owns County Road 3 over Big Thompson River?
It is owned by the County Highway Agency.