State Route 78 over Alamo River
FairImperial County, California · 11-IMP-078-17.48 · Structure no. 58 0118
- Built
- 1982
- 43 years old
- Condition
- Fair
- inspected January 2025
- Type
- Slab
- Concrete Continuous
- Length
- 170 ft
- 5 main spans
- Daily traffic
- 6,300
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 78 over Alamo River is a concrete continuous slab carrying State Route 78 over Alamo River in Imperial County, California. It was built in 1982, so it is 43 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 6,300 vehicles a day, roughly 34% of them trucks, projected to reach 15,185 by 2046. The structure is 170 ft (51.8 m) long and 44 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 8 Very Good | No problems noted. |
| 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 78 over Alamo River built?
It was built in 1982, making it 43 years old in 2025.
What condition is State Route 78 over Alamo River 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 78 over Alamo River carry?
About 6,300 vehicles per day (2020 count), of which roughly 34% are trucks.
How long is State Route 78 over Alamo River?
The structure is 170 ft (51.8 m) long with a longest span of 37 ft (11.3 m) and a deck 44 ft wide.
Who owns State Route 78 over Alamo River?
It is owned by the State Highway Agency.