Keystone RD over Alamo River
FairImperial County, California · 1.5 MI E/O Mcconnell RD · Structure no. 58C0103
- Built
- 1979
- 46 years old
- Condition
- Fair
- inspected January 2024
- Type
- Slab
- Concrete Continuous
- Length
- 108 ft
- 3 main spans
- Daily traffic
- 922
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
Keystone RD over Alamo River is a concrete continuous slab carrying Keystone RD over Alamo River in Imperial County, California. It was built in 1979, so it is 46 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 5 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 922 vehicles a day, roughly 1% of them trucks, projected to reach 1,008 by 2042. The structure is 108 ft (32.9 m) long and 32 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Keystone RD over Alamo River built?
It was built in 1979, making it 46 years old in 2025.
What condition is Keystone RD 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 2024.
How much traffic does Keystone RD over Alamo River carry?
About 922 vehicles per day (2020 count), of which roughly 1% are trucks.
How long is Keystone RD over Alamo River?
The structure is 108 ft (32.9 m) long with a longest span of 35 ft (10.7 m) and a deck 32 ft wide.
Who owns Keystone RD over Alamo River?
It is owned by the County Highway Agency.