Interstate 5 SB over Siskiyou Way
FairSiskiyou County, California · 02-SIS-005-R18.71-WEED · Structure no. 02 0163L
- Built
- 1973
- 52 years old
- Condition
- Fair
- inspected July 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 146 ft
- 1 main span
- Daily traffic
- 7,150
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 5 SB over Siskiyou Way is a prestressed concrete box beam or girders - multiple carrying Interstate 5 SB over Siskiyou Way in Siskiyou County, California. It was built in 1973, so it is 52 years old, younger than the California average of 54.8 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 7,150 vehicles a day, roughly 26% of them trucks, projected to reach 16,377 by 2045. The structure is 146 ft (44.4 m) long and 54 ft wide. If it were closed, the detour would be 0.6 mi (1 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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 5 SB over Siskiyou Way built?
It was built in 1973, making it 52 years old in 2025.
What condition is Interstate 5 SB over Siskiyou Way 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 July 2024.
How much traffic does Interstate 5 SB over Siskiyou Way carry?
About 7,150 vehicles per day (2024 count), of which roughly 26% are trucks.
How long is Interstate 5 SB over Siskiyou Way?
The structure is 146 ft (44.4 m) long with a longest span of 143 ft (43.6 m) and a deck 54 ft wide.
Who owns Interstate 5 SB over Siskiyou Way?
It is owned by the State Highway Agency.