Frontage Road over State Route 99
PoorSan Joaquin County, California · 10-SJ-099-21.91 · Structure no. 29 0095
- Built
- 1964
- 61 years old
- Condition
- Poor
- inspected June 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 234 ft
- 2 main spans
- Daily traffic
- 500
- 1998 count
- Owner
- State
- State Highway Agency
About this bridge
Frontage Road over State Route 99 is a prestressed concrete stringer/multi-beam or girder carrying Frontage Road 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 500 vehicles a day, roughly 10% of them trucks, projected to reach 5,598 by 2044. The structure is 234 ft (71.3 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Frontage Road over State Route 99 built?
It was built in 1964, making it 61 years old in 2025.
What condition is Frontage Road over State Route 99 in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2024.
How much traffic does Frontage Road over State Route 99 carry?
About 500 vehicles per day (1998 count), of which roughly 10% are trucks.
How long is Frontage Road over State Route 99?
The structure is 234 ft (71.3 m) long with a longest span of 80 ft (24.4 m) and a deck 39 ft wide.
Who owns Frontage Road over State Route 99?
It is owned by the State Highway Agency.