Avenue 18 1/2 over SR 99
FairMadera County, California · 06-MAD-099-R16.33 · Structure no. 41 0069
- Built
- 1974
- 51 years old
- Condition
- Fair
- inspected June 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 342 ft
- 2 main spans
- Daily traffic
- 1,310
- 1998 count
- Owner
- State
- State Highway Agency
About this bridge
Avenue 18 1/2 over SR 99 is a prestressed concrete continuous box beam or girders - multiple carrying Avenue 18 1/2 over SR 99 in Madera County, California. It was built in 1974, so it is 51 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 1,310 vehicles a day, roughly 10% of them trucks, projected to reach 2,726 by 2041. The structure is 342 ft (104.2 m) long and 59 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Avenue 18 1/2 over SR 99 built?
It was built in 1974, making it 51 years old in 2025.
What condition is Avenue 18 1/2 over SR 99 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 June 2023.
How much traffic does Avenue 18 1/2 over SR 99 carry?
About 1,310 vehicles per day (1998 count), of which roughly 10% are trucks.
How long is Avenue 18 1/2 over SR 99?
The structure is 342 ft (104.2 m) long with a longest span of 174 ft (53 m) and a deck 59 ft wide.
Who owns Avenue 18 1/2 over SR 99?
It is owned by the State Highway Agency.