Ayers Road over Mount Diablo Creek
PoorContra Costa County, California · 0.3 MI N Clayton RD · Structure no. 28C0362
- Built
- 1987
- 38 years old
- Condition
- Poor
- inspected November 2023
- Type
- Slab
- Prestressed Concrete
- Length
- 60 ft
- 1 main span
- Daily traffic
- 8,000
- 1990 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
Ayers Road over Mount Diablo Creek is a prestressed concrete slab carrying Ayers Road over Mount Diablo Creek in Contra Costa County, California. It was built in 1987, so it is 38 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 8,000 vehicles a day, roughly 4% of them trucks, projected to reach 15,768 by 2040. The structure is 60 ft (18.3 m) long and 54 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Ayers Road over Mount Diablo Creek built?
It was built in 1987, making it 38 years old in 2025.
What condition is Ayers Road over Mount Diablo Creek 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 November 2023.
How much traffic does Ayers Road over Mount Diablo Creek carry?
About 8,000 vehicles per day (1990 count), of which roughly 4% are trucks.
How long is Ayers Road over Mount Diablo Creek?
The structure is 60 ft (18.3 m) long with a longest span of 57 ft (17.4 m) and a deck 54 ft wide.
Who owns Ayers Road over Mount Diablo Creek?
It is owned by the City or Municipal Highway Agency.