Mountain Shadow LN over Big Thompson River
GoodLarimer County, Colorado · 25 Ft S of US HWY 34 · Structure no. LRB12-1748BTC
- Built
- 1977
- 48 years old
- Condition
- Good
- inspected June 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 50 ft
- 1 main span
- Daily traffic
- 5
- 2023 count
- Owner
- County
- County Highway Agency
About this bridge
Mountain Shadow LN over Big Thompson River is a prestressed concrete tee beam carrying Mountain Shadow LN over Big Thompson River in Larimer County, Colorado. It was built in 1977, so it is 48 years old, older than the Colorado average of 42.2 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 5 vehicles a day, projected to reach 6 by 2042. The structure is 50 ft (15.2 m) long and 12 ft wide. If it were closed, the detour would be 98.8 mi (159 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| 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 Shadow LN over Big Thompson River built?
It was built in 1977, making it 48 years old in 2025.
What condition is Mountain Shadow LN over Big Thompson River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2023.
How much traffic does Mountain Shadow LN over Big Thompson River carry?
About 5 vehicles per day (2023 count).
How long is Mountain Shadow LN over Big Thompson River?
The structure is 50 ft (15.2 m) long with a longest span of 48 ft (14.6 m) and a deck 12 ft wide.
Who owns Mountain Shadow LN over Big Thompson River?
It is owned by the County Highway Agency.