SH 121 Ml over Highline Canal
FairJefferson County, Colorado · South of 92nd Ave. · Structure no. E-16-HN
- Built
- 1968
- 57 years old
- Condition
- Fair
- inspected January 2025
- Type
- Culvert
- Concrete
- Length
- 22 ft
- 1 main span
- Daily traffic
- 43,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
SH 121 Ml over Highline Canal is a concrete culvert carrying SH 121 Ml over Highline Canal in Jefferson County, Colorado. It was built in 1968, so it is 57 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 5 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 43,000 vehicles a day, roughly 1% of them trucks, projected to reach 50,310 by 2040. The structure is 22 ft (6.6 m) long and 145 ft wide. If it were closed, the detour would be 0.6 mi (1 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 | 8 Very Good | No problems noted. |
| Culvert | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 121 Ml over Highline Canal built?
It was built in 1968, making it 57 years old in 2025.
What condition is SH 121 Ml over Highline Canal 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 Highline Canal carry?
About 43,000 vehicles per day (2020 count), of which roughly 1% are trucks.
How long is SH 121 Ml over Highline Canal?
The structure is 22 ft (6.6 m) long with a longest span of 22 ft (6.6 m) and a deck 145 ft wide.
Who owns SH 121 Ml over Highline Canal?
It is owned by the State Highway Agency.