Johnson Road over California Aqueduct
PoorSan Bernardino County, California · 1.2 MI S of Palmdale RD · Structure no. 54C0498
- Built
- 1971
- 54 years old
- Condition
- Poor
- inspected September 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 107 ft
- 1 main span
- Daily traffic
- 1,835
- 2017 count
- Owner
- Local
- Other Local Agency
About this bridge
Johnson Road over California Aqueduct is a prestressed concrete stringer/multi-beam or girder carrying Johnson Road over California Aqueduct in San Bernardino County, California. It was built in 1971, so it is 54 years old, younger 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 1,835 vehicles a day, roughly 1% of them trucks, projected to reach 2,317 by 2042. The structure is 107 ft (32.6 m) long and 32 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Johnson Road over California Aqueduct built?
It was built in 1971, making it 54 years old in 2025.
What condition is Johnson Road over California Aqueduct 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 September 2023.
How much traffic does Johnson Road over California Aqueduct carry?
About 1,835 vehicles per day (2017 count), of which roughly 1% are trucks.
How long is Johnson Road over California Aqueduct?
The structure is 107 ft (32.6 m) long with a longest span of 103 ft (31.4 m) and a deck 32 ft wide.
Who owns Johnson Road over California Aqueduct?
It is owned by the Other Local Agency and maintained by the County Highway Agency.