Lake ST over Interstate 5
FairSiskiyou County, California · 02-SIS-005-R10.48-MSHA · Structure no. 02 0037
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected September 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 210 ft
- 4 main spans
- Daily traffic
- 1,468
- 2015 count
- Owner
- State
- State Highway Agency
About this bridge
Lake ST over Interstate 5 is a concrete continuous tee beam carrying Lake ST over Interstate 5 in Siskiyou County, California. It was built in 1964, so it is 61 years old, older 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 5 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 1,468 vehicles a day, roughly 2% of them trucks, projected to reach 2,095 by 2040. The structure is 210 ft (64 m) long and 40 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Lake ST over Interstate 5 built?
It was built in 1964, making it 61 years old in 2025.
What condition is Lake ST over Interstate 5 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 September 2023.
How much traffic does Lake ST over Interstate 5 carry?
About 1,468 vehicles per day (2015 count), of which roughly 2% are trucks.
How long is Lake ST over Interstate 5?
The structure is 210 ft (64 m) long with a longest span of 76 ft (23.3 m) and a deck 40 ft wide.
Who owns Lake ST over Interstate 5?
It is owned by the State Highway Agency.