SH 121 Ml over Arvada Channel
FairJefferson County, Colorado · 0.1 Mi. N. of I 76 · Structure no. E-16-KQ
- Built
- 1982
- 43 years old
- Condition
- Fair
- inspected January 2025
- Type
- Culvert
- Concrete
- Length
- 25 ft
- 2 main spans
- Daily traffic
- 58,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
SH 121 Ml over Arvada Channel is a concrete culvert carrying SH 121 Ml over Arvada Channel in Jefferson County, Colorado. It was built in 1982, so it is 43 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 58,000 vehicles a day, roughly 2% of them trucks, projected to reach 62,640 by 2040. The structure is 25 ft (7.6 m) long and 156 ft wide. If it were closed, the detour would be 8.7 mi (14 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 |
|---|---|---|
| Channel and channel protection | 7 Good | Some minor problems. |
| Culvert | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 121 Ml over Arvada Channel built?
It was built in 1982, making it 43 years old in 2025.
What condition is SH 121 Ml over Arvada Channel 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 January 2025.
How much traffic does SH 121 Ml over Arvada Channel carry?
About 58,000 vehicles per day (2020 count), of which roughly 2% are trucks.
How long is SH 121 Ml over Arvada Channel?
The structure is 25 ft (7.6 m) long with a longest span of 12 ft (3.7 m) and a deck 156 ft wide.
Who owns SH 121 Ml over Arvada Channel?
It is owned by the State Highway Agency.