Tinkham Road over S.Fk. Snoqualmie River
FairKing County, Washington · I90 East Exit 47 · Structure no. 060505000032684
- Built
- 1972
- 53 years old
- Condition
- Fair
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 490 ft
- 5 main spans
- Daily traffic
- 120
- 2017 count
- Owner
- Federal
- U.S. Forest Service
About this bridge
Tinkham Road over S.Fk. Snoqualmie River is a prestressed concrete stringer/multi-beam or girder carrying Tinkham Road over S.Fk. Snoqualmie River in King County, Washington. It was built in 1972, so it is 53 years old, older than the Washington average of 49.8 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 120 vehicles a day, roughly 20% of them trucks, projected to reach 180 by 2045. The structure is 490 ft (149.4 m) long and 28 ft wide. If it were closed, the detour would be 11.8 mi (19 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Tinkham Road over S.Fk. Snoqualmie River built?
It was built in 1972, making it 53 years old in 2025.
What condition is Tinkham Road over S.Fk. Snoqualmie River 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 October 2023.
How much traffic does Tinkham Road over S.Fk. Snoqualmie River carry?
About 120 vehicles per day (2017 count), of which roughly 20% are trucks.
How long is Tinkham Road over S.Fk. Snoqualmie River?
The structure is 490 ft (149.4 m) long with a longest span of 100 ft (30.5 m) and a deck 28 ft wide.
Who owns Tinkham Road over S.Fk. Snoqualmie River?
It is owned by the U.S. Forest Service.