Old Belfair Highwa over Union River
GoodMason County, Washington · 1.19 N JCT SR 300 · Structure no. 082683000000000
- Built
- 1987
- 38 years old
- Condition
- Good
- inspected June 2024
- Type
- Slab
- Concrete
- Length
- 65 ft
- 3 main spans
- Daily traffic
- 3,517
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
Old Belfair Highwa over Union River is a concrete slab carrying Old Belfair Highwa over Union River in Mason County, Washington. It was built in 1987, so it is 38 years old, younger than the Washington average of 49.8 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 3,517 vehicles a day, roughly 5% of them trucks, projected to reach 6,000 by 2040. The structure is 65 ft (19.8 m) long and 42 ft wide. If it were closed, the detour would be 11.8 mi (19 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old Belfair Highwa over Union River built?
It was built in 1987, making it 38 years old in 2025.
What condition is Old Belfair Highwa over Union River 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 June 2024.
How much traffic does Old Belfair Highwa over Union River carry?
About 3,517 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is Old Belfair Highwa over Union River?
The structure is 65 ft (19.8 m) long with a longest span of 25 ft (7.5 m) and a deck 42 ft wide.
Who owns Old Belfair Highwa over Union River?
It is owned by the County Highway Agency.