Avenue 21 over Ash Slough
FairMadera County, California · 0.15 MI E of RD 7 · Structure no. 41C0102
- Built
- 1971
- 54 years old
- Condition
- Fair
- inspected March 2023
- Type
- Slab
- Concrete Continuous
- Length
- 300 ft
- 9 main spans
- Daily traffic
- 150
- 1979 count
- Owner
- County
- County Highway Agency
About this bridge
Avenue 21 over Ash Slough is a concrete continuous slab carrying Avenue 21 over Ash Slough in Madera 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 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 150 vehicles a day, roughly 10% of them trucks, projected to reach 272 by 2041. The structure is 300 ft (91.4 m) long and 31 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Avenue 21 over Ash Slough built?
It was built in 1971, making it 54 years old in 2025.
What condition is Avenue 21 over Ash Slough 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 March 2023.
How much traffic does Avenue 21 over Ash Slough carry?
About 150 vehicles per day (1979 count), of which roughly 10% are trucks.
How long is Avenue 21 over Ash Slough?
The structure is 300 ft (91.4 m) long with a longest span of 30 ft (9.1 m) and a deck 31 ft wide.
Who owns Avenue 21 over Ash Slough?
It is owned by the County Highway Agency.