SH 121 Ml Nbnd over US 287 Ml RR Spur
FairBroomfield County, Colorado · In Broomfield · Structure no. E-16-HR
- Built
- 1972
- 53 years old
- Condition
- Fair
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 453 ft
- 4 main spans
- Daily traffic
- 25,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
SH 121 Ml Nbnd over US 287 Ml RR Spur is a steel continuous stringer/multi-beam or girder carrying SH 121 Ml Nbnd over US 287 Ml RR Spur in Broomfield County, Colorado. It was built in 1972, so it is 53 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 25,000 vehicles a day, roughly 3% of them trucks, projected to reach 29,000 by 2040. The structure is 453 ft (138.2 m) long and 31 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 |
|---|---|---|
| Deck | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 121 Ml Nbnd over US 287 Ml RR Spur built?
It was built in 1972, making it 53 years old in 2025.
What condition is SH 121 Ml Nbnd over US 287 Ml RR Spur 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 Nbnd over US 287 Ml RR Spur carry?
About 25,000 vehicles per day (2020 count), of which roughly 3% are trucks.
How long is SH 121 Ml Nbnd over US 287 Ml RR Spur?
The structure is 453 ft (138.2 m) long with a longest span of 114 ft (34.6 m) and a deck 31 ft wide.
Who owns SH 121 Ml Nbnd over US 287 Ml RR Spur?
It is owned by the State Highway Agency.