Interstate 505 NB over Allendale RD
FairSolano County, California · 04-SOL-505-R5.57 · Structure no. 23 0169R
- Built
- 1974
- 51 years old
- Condition
- Fair
- inspected April 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 91 ft
- 1 main span
- Daily traffic
- 11,400
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 505 NB over Allendale RD is a prestressed concrete box beam or girders - multiple carrying Interstate 505 NB over Allendale RD in Solano County, California. It was built in 1974, so it is 51 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 11,400 vehicles a day, roughly 10% of them trucks, projected to reach 18,962 by 2046. The structure is 91 ft (27.7 m) long and 42 ft wide. If it were closed, the detour would be 0.6 mi (1 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 Interstate 505 NB over Allendale RD built?
It was built in 1974, making it 51 years old in 2025.
What condition is Interstate 505 NB over Allendale RD 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 Interstate 505 NB over Allendale RD carry?
About 11,400 vehicles per day (2009 count), of which roughly 10% are trucks.
How long is Interstate 505 NB over Allendale RD?
The structure is 91 ft (27.7 m) long with a longest span of 89 ft (27.1 m) and a deck 42 ft wide.
Who owns Interstate 505 NB over Allendale RD?
It is owned by the State Highway Agency.