State Route 99 NB over Lassen Ave
FairButte County, California · 03-BUT-099-R35.31 · Structure no. 12 0159R
- Built
- 1966
- 59 years old
- Condition
- Fair
- inspected April 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 110 ft
- 3 main spans
- Daily traffic
- 14,250
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 NB over Lassen Ave is a concrete continuous tee beam carrying State Route 99 NB over Lassen Ave in Butte County, California. It was built in 1966, so it is 59 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 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 14,250 vehicles a day, roughly 12% of them trucks, projected to reach 27,804 by 2046. The structure is 110 ft (33.5 m) long and 40 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 State Route 99 NB over Lassen Ave built?
It was built in 1966, making it 59 years old in 2025.
What condition is State Route 99 NB over Lassen Ave 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 April 2024.
How much traffic does State Route 99 NB over Lassen Ave carry?
About 14,250 vehicles per day (2020 count), of which roughly 12% are trucks.
How long is State Route 99 NB over Lassen Ave?
The structure is 110 ft (33.5 m) long with a longest span of 52 ft (15.8 m) and a deck 40 ft wide.
Who owns State Route 99 NB over Lassen Ave?
It is owned by the State Highway Agency.