State Route 20 over Slacks Ravine
GoodNevada County, California · 03-NEV-020-R0.95 · Structure no. 17 0104
- Built
- 2008
- 17 years old
- Condition
- Good
- inspected July 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 164 ft
- 1 main span
- Daily traffic
- 8,200
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 20 over Slacks Ravine is a prestressed concrete box beam or girders - multiple carrying State Route 20 over Slacks Ravine in Nevada County, California. It was built in 2008, so it is 17 years old, younger 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 8,200 vehicles a day, roughly 5% of them trucks, projected to reach 14,570 by 2042. The structure is 164 ft (50 m) long and 42 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 | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 20 over Slacks Ravine built?
It was built in 2008, making it 17 years old in 2025.
What condition is State Route 20 over Slacks Ravine 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 July 2024.
How much traffic does State Route 20 over Slacks Ravine carry?
About 8,200 vehicles per day (2020 count), of which roughly 5% are trucks.
How long is State Route 20 over Slacks Ravine?
The structure is 164 ft (50 m) long with a longest span of 160 ft (48.8 m) and a deck 42 ft wide.
Who owns State Route 20 over Slacks Ravine?
It is owned by the State Highway Agency.