SH170 Ml(mccaslin) over US 36 Ml
FairBoulder County, Colorado · 3.9 MI E of JCT SH 93 · Structure no. E-16-KZ
- Built
- 1983
- 42 years old, rebuilt 2016
- Condition
- Fair
- inspected March 2025
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 193 ft
- 2 main spans
- Daily traffic
- 24,000
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
SH170 Ml(mccaslin) over US 36 Ml is a prestressed concrete continuous stringer/multi-beam or girder carrying SH170 Ml(mccaslin) over US 36 Ml in Boulder County, Colorado. It was built in 1983 and reconstructed in 2016, so it is 42 years old, younger 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 24,000 vehicles a day, roughly 3% of them trucks, projected to reach 30,960 by 2040. The structure is 193 ft (58.7 m) long and 109 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was SH170 Ml(mccaslin) over US 36 Ml built?
It was built in 1983, making it 42 years old in 2025. It was reconstructed in 2016.
What condition is SH170 Ml(mccaslin) over US 36 Ml 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 March 2025.
How much traffic does SH170 Ml(mccaslin) over US 36 Ml carry?
About 24,000 vehicles per day (2020 count), of which roughly 3% are trucks.
How long is SH170 Ml(mccaslin) over US 36 Ml?
The structure is 193 ft (58.7 m) long with a longest span of 95 ft (29 m) and a deck 109 ft wide.
Who owns SH170 Ml(mccaslin) over US 36 Ml?
It is owned by the State Highway Agency.