SH 121 Ml over Ralston Creek
GoodJefferson County, Colorado · Just N. of Ralston RD · Structure no. E-16-PT
- Built
- 1996
- 29 years old
- Condition
- Good
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 248 ft
- 3 main spans
- Daily traffic
- 41,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
SH 121 Ml over Ralston Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying SH 121 Ml over Ralston Creek in Jefferson County, Colorado. It was built in 1996, so it is 29 years old, younger than the Colorado average of 42.2 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 41,000 vehicles a day, roughly 2% of them trucks, projected to reach 44,280 by 2040. The structure is 248 ft (75.6 m) long and 119 ft wide. If it were closed, the detour would be 0.6 mi (1 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| 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 Ralston Creek built?
It was built in 1996, making it 29 years old in 2025.
What condition is SH 121 Ml over Ralston Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.
How much traffic does SH 121 Ml over Ralston Creek carry?
About 41,000 vehicles per day (2020 count), of which roughly 2% are trucks.
How long is SH 121 Ml over Ralston Creek?
The structure is 248 ft (75.6 m) long with a longest span of 98 ft (29.9 m) and a deck 119 ft wide.
Who owns SH 121 Ml over Ralston Creek?
It is owned by the State Highway Agency.