NW 170 ST over I-75
GoodMiami-Dade County, Florida · 0.75 MI S of SR-860 · Structure no. 870596
- Built
- 1984
- 41 years old
- Condition
- Good
- inspected August 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 386 ft
- 5 main spans
- Daily traffic
- 4,300
- 2024 count
- Owner
- County
- County Highway Agency
About this bridge
NW 170 ST over I-75 is a prestressed concrete stringer/multi-beam or girder carrying NW 170 ST over I-75 in Miami-Dade County, Florida. It was built in 1984, so it is 41 years old, younger than the Florida average of 41.3 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 4,300 vehicles a day, projected to reach 8,000 by 2042. The structure is 386 ft (117.8 m) long and 47 ft wide. If it were closed, the detour would be 5.6 mi (9 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 | 7 Good | Some minor problems. |
| 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 NW 170 ST over I-75 built?
It was built in 1984, making it 41 years old in 2025.
What condition is NW 170 ST over I-75 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 August 2024.
How much traffic does NW 170 ST over I-75 carry?
About 4,300 vehicles per day (2024 count).
How long is NW 170 ST over I-75?
The structure is 386 ft (117.8 m) long with a longest span of 113 ft (34.4 m) and a deck 47 ft wide.
Who owns NW 170 ST over I-75?
It is owned by the County Highway Agency.