Mountain River RD over Little Thompson River
FairLarimer County, Colorado · 50 Ft S of W CR 4 · Structure no. LRMTNRIVERRD1
- Built
- 1936
- 89 years old, rebuilt 2003
- Condition
- Fair
- inspected April 2023
- Type
- Truss - Thru
- Steel
- Length
- 103 ft
- 1 main span
- Daily traffic
- 42
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Mountain River RD over Little Thompson River is a steel truss - thru carrying Mountain River RD over Little Thompson River in Larimer County, Colorado. It was built in 1936 and reconstructed in 2003, so it is 89 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 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 42 vehicles a day, roughly 20% of them trucks, projected to reach 53 by 2042. The structure is 103 ft (31.5 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 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 | 8 Very Good | No problems noted. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mountain River RD over Little Thompson River built?
It was built in 1936, making it 89 years old in 2025. It was reconstructed in 2003.
What condition is Mountain River RD over Little 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 April 2023.
How much traffic does Mountain River RD over Little Thompson River carry?
About 42 vehicles per day (2023 count), of which roughly 20% are trucks.
How long is Mountain River RD over Little Thompson River?
The structure is 103 ft (31.5 m) long with a longest span of 98 ft (30 m) and a deck 32 ft wide.
Who owns Mountain River RD over Little Thompson River?
It is owned by the County Highway Agency.