State Route 99 NB over Edgar Slough
GoodButte County, California · 03-BUT-099-30.03 · Structure no. 12 0128R
- Built
- 1952
- 73 years old
- Condition
- Good
- inspected May 2021
- Type
- Slab
- Concrete Continuous
- Length
- 78 ft
- 3 main spans
- Daily traffic
- 14,125
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 NB over Edgar Slough is a concrete continuous slab carrying State Route 99 NB over Edgar Slough in Butte County, California. It was built in 1952, so it is 73 years old, older than the California average of 54.8 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 14,125 vehicles a day, roughly 10% of them trucks, projected to reach 26,278 by 2039. The structure is 78 ft (23.8 m) long and 44 ft wide. If it were closed, the detour would be 5 mi (8 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. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 NB over Edgar Slough built?
It was built in 1952, making it 73 years old in 2025.
What condition is State Route 99 NB over Edgar Slough 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 May 2021.
How much traffic does State Route 99 NB over Edgar Slough carry?
About 14,125 vehicles per day (2009 count), of which roughly 10% are trucks.
How long is State Route 99 NB over Edgar Slough?
The structure is 78 ft (23.8 m) long with a longest span of 30 ft (9.1 m) and a deck 44 ft wide.
Who owns State Route 99 NB over Edgar Slough?
It is owned by the State Highway Agency.