State Route 20 over Interstate 5
FairColusa County, California · 03-COL-020-R22.09 · Structure no. 15 0078
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected January 2025
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 284 ft
- 2 main spans
- Daily traffic
- 5,800
- 2013 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 20 over Interstate 5 is a prestressed concrete continuous box beam or girders - multiple carrying State Route 20 over Interstate 5 in Colusa County, California. It was built in 1971, so it is 54 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 5,800 vehicles a day, roughly 11% of them trucks, projected to reach 7,100 by 2043. The structure is 284 ft (86.6 m) long and 42 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 20 over Interstate 5 built?
It was built in 1971, making it 54 years old in 2025.
What condition is State Route 20 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 January 2025.
How much traffic does State Route 20 over Interstate 5 carry?
About 5,800 vehicles per day (2013 count), of which roughly 11% are trucks.
How long is State Route 20 over Interstate 5?
The structure is 284 ft (86.6 m) long with a longest span of 141 ft (43 m) and a deck 42 ft wide.
Who owns State Route 20 over Interstate 5?
It is owned by the State Highway Agency.