SH 121 Ml over Clear Creek
FairJefferson County, Colorado · S. Edge 70 76 Ramp 121 · Structure no. E-16-O
- Built
- 1941
- 84 years old, rebuilt 1980
- Condition
- Fair
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 157 ft
- 3 main spans
- Daily traffic
- 38,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
SH 121 Ml over Clear Creek is a steel stringer/multi-beam or girder carrying SH 121 Ml over Clear Creek in Jefferson County, Colorado. It was built in 1941 and reconstructed in 1980, so it is 84 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 38,000 vehicles a day, roughly 2% of them trucks, projected to reach 39,520 by 2040. The structure is 157 ft (47.8 m) long and 123 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 121 Ml over Clear Creek built?
It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1980.
What condition is SH 121 Ml over Clear 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 January 2025.
How much traffic does SH 121 Ml over Clear Creek carry?
About 38,000 vehicles per day (2020 count), of which roughly 2% are trucks.
How long is SH 121 Ml over Clear Creek?
The structure is 157 ft (47.8 m) long with a longest span of 53 ft (16.1 m) and a deck 123 ft wide.
Who owns SH 121 Ml over Clear Creek?
It is owned by the State Highway Agency.