SH 121 Ml Sbnd over US 287 Ml RR Spur
PoorBroomfield County, Colorado · In Broomfield · Structure no. E-16-HS
- Built
- 1972
- 53 years old
- Condition
- Poor
- inspected January 2025
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 468 ft
- 4 main spans
- Daily traffic
- 25,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
SH 121 Ml Sbnd over US 287 Ml RR Spur is a steel continuous stringer/multi-beam or girder carrying SH 121 Ml Sbnd 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 25,000 vehicles a day, roughly 3% of them trucks, projected to reach 29,000 by 2040. The structure is 468 ft (142.6 m) long and 43 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 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 121 Ml Sbnd 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 Sbnd over US 287 Ml RR Spur in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in January 2025.
How much traffic does SH 121 Ml Sbnd 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 Sbnd over US 287 Ml RR Spur?
The structure is 468 ft (142.6 m) long with a longest span of 115 ft (34.9 m) and a deck 43 ft wide.
Who owns SH 121 Ml Sbnd over US 287 Ml RR Spur?
It is owned by the State Highway Agency.