SH 121 Ml over Sanderson Gulch
FairJefferson County, Colorado · Just S. of Jewell Ave. · Structure no. F-16-JJ
- Built
- 1976
- 49 years old, rebuilt 1986
- Condition
- Fair
- inspected January 2025
- Type
- Culvert
- Concrete
- Length
- 22 ft
- 2 main spans
- Daily traffic
- 42,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
SH 121 Ml over Sanderson Gulch is a concrete culvert carrying SH 121 Ml over Sanderson Gulch in Jefferson County, Colorado. It was built in 1976 and reconstructed in 1986, so it is 49 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 42,000 vehicles a day, roughly 2% of them trucks, projected to reach 45,780 by 2040. The structure is 22 ft (6.6 m) long and 112 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 |
|---|---|---|
| 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 Sanderson Gulch built?
It was built in 1976, making it 49 years old in 2025. It was reconstructed in 1986.
What condition is SH 121 Ml over Sanderson Gulch 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 Sanderson Gulch carry?
About 42,000 vehicles per day (2020 count), of which roughly 2% are trucks.
How long is SH 121 Ml over Sanderson Gulch?
The structure is 22 ft (6.6 m) long with a longest span of 10 ft (3.2 m) and a deck 112 ft wide.
Who owns SH 121 Ml over Sanderson Gulch?
It is owned by the State Highway Agency.