120th Avenue over Box Elder Creek
FairAdams County, Colorado · 0.3 MI West of Watkins RD · Structure no. ADA120-23.7N186
- Built
- 1997
- 28 years old
- Condition
- Fair
- inspected December 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 242 ft
- 3 main spans
- Daily traffic
- 2,358
- 2021 count
- Owner
- County
- County Highway Agency
About this bridge
120th Avenue over Box Elder Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying 120th Avenue over Box Elder Creek in Adams County, Colorado. It was built in 1997, so it is 28 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 2,358 vehicles a day, roughly 4% of them trucks, projected to reach 3,066 by 2041. The structure is 242 ft (73.9 m) long and 38 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was 120th Avenue over Box Elder Creek built?
It was built in 1997, making it 28 years old in 2025.
What condition is 120th Avenue over Box Elder Creek 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 December 2023.
How much traffic does 120th Avenue over Box Elder Creek carry?
About 2,358 vehicles per day (2021 count), of which roughly 4% are trucks.
How long is 120th Avenue over Box Elder Creek?
The structure is 242 ft (73.9 m) long with a longest span of 98 ft (29.9 m) and a deck 38 ft wide.
Who owns 120th Avenue over Box Elder Creek?
It is owned by the County Highway Agency.