Armstrong RD over State Route 99
FairSan Joaquin County, California · 10-SJ-099-27.50 · Structure no. 29 0104
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 262 ft
- 2 main spans
- Daily traffic
- 3,000
- 2014 count
- Owner
- State
- State Highway Agency
About this bridge
Armstrong RD over State Route 99 is a prestressed concrete continuous stringer/multi-beam or girder carrying Armstrong RD over State Route 99 in San Joaquin County, California. It was built in 1964, so it is 61 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 3,000 vehicles a day, roughly 4% of them trucks, projected to reach 4,420 by 2042. The structure is 262 ft (79.9 m) long and 39 ft wide. If it were closed, the detour would be 5 mi (8 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 | 7 Good | Some minor problems. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Armstrong RD over State Route 99 built?
It was built in 1964, making it 61 years old in 2025.
What condition is Armstrong RD over State Route 99 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 July 2024.
How much traffic does Armstrong RD over State Route 99 carry?
About 3,000 vehicles per day (2014 count), of which roughly 4% are trucks.
How long is Armstrong RD over State Route 99?
The structure is 262 ft (79.9 m) long with a longest span of 100 ft (30.5 m) and a deck 39 ft wide.
Who owns Armstrong RD over State Route 99?
It is owned by the State Highway Agency.