Duncan Island Road over Duncan Inlet
GoodLane County, Oregon · 075 MI W HWY126-SIUSLAW R · Structure no. 39C524503700008
- Built
- 1992
- 33 years old
- Condition
- Good
- inspected September 2023
- Type
- Slab
- Prestressed Concrete
- Length
- 251 ft
- 4 main spans
- Daily traffic
- 65
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
Duncan Island Road over Duncan Inlet is a prestressed concrete slab carrying Duncan Island Road over Duncan Inlet in Lane County, Oregon. It was built in 1992, so it is 33 years old, younger than the Oregon average of 49.9 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 65 vehicles a day, projected to reach 75 by 2025. The structure is 251 ft (76.5 m) long and 24 ft wide. If it were closed, the detour would be 123.7 mi (199 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. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Duncan Island Road over Duncan Inlet built?
It was built in 1992, making it 33 years old in 2025.
What condition is Duncan Island Road over Duncan Inlet 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 September 2023.
How much traffic does Duncan Island Road over Duncan Inlet carry?
About 65 vehicles per day (2020 count).
How long is Duncan Island Road over Duncan Inlet?
The structure is 251 ft (76.5 m) long with a longest span of 63 ft (19.2 m) and a deck 24 ft wide.
Who owns Duncan Island Road over Duncan Inlet?
It is owned by the County Highway Agency.