SH 170 Ml over South Boulder Creek
FairBoulder County, Colorado · 0.9 MI W. of El Dorado SP · Structure no. E-15-AH
- Built
- 1930
- 95 years old, rebuilt 1993
- Condition
- Fair
- inspected August 2023
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 41 ft
- 1 main span
- Daily traffic
- 388
- 2023 count
- Owner
- State
- State Park, Forest, or Reservation Agency
About this bridge
SH 170 Ml over South Boulder Creek is a steel stringer/multi-beam or girder carrying SH 170 Ml over South Boulder Creek in Boulder County, Colorado. It was built in 1930 and reconstructed in 1993, so it is 95 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 6 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 388 vehicles a day, roughly 5% of them trucks, projected to reach 466 by 2043. The structure is 41 ft (12.5 m) long and 16 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH 170 Ml over South Boulder Creek built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1993.
What condition is SH 170 Ml over South Boulder 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 August 2023.
How much traffic does SH 170 Ml over South Boulder Creek carry?
About 388 vehicles per day (2023 count), of which roughly 5% are trucks.
How long is SH 170 Ml over South Boulder Creek?
The structure is 41 ft (12.5 m) long with a longest span of 37 ft (11.3 m) and a deck 16 ft wide.
Who owns SH 170 Ml over South Boulder Creek?
It is owned by the State Park, Forest, or Reservation Agency.