SR 99 over SR 104
GoodSnohomish County, Washington · JCT SR 104 · Structure no. 0009698A0000000
- Built
- 1975
- 50 years old
- Condition
- Good
- inspected October 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 133 ft
- 1 main span
- Daily traffic
- 31,082
- 2023 count
- Owner
- State
- State Highway Agency
About this bridge
SR 99 over SR 104 is a prestressed concrete stringer/multi-beam or girder carrying SR 99 over SR 104 in Snohomish County, Washington. It was built in 1975, so it is 50 years old, older 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 31,082 vehicles a day, roughly 3% of them trucks, projected to reach 48,331 by 2039. The structure is 133 ft (40.5 m) long and 66 ft wide. If it were closed, the detour would be 1.2 mi (2 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 SR 99 over SR 104 built?
It was built in 1975, making it 50 years old in 2025.
What condition is SR 99 over SR 104 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 October 2023.
How much traffic does SR 99 over SR 104 carry?
About 31,082 vehicles per day (2023 count), of which roughly 3% are trucks.
How long is SR 99 over SR 104?
The structure is 133 ft (40.5 m) long with a longest span of 128 ft (39 m) and a deck 66 ft wide.
Who owns SR 99 over SR 104?
It is owned by the State Highway Agency.