SR 189 over Mariposa Canyon
FairSanta Cruz County, Arizona · 1.4 MI W JCT I-19 · Structure no. 01796
- Built
- 1976
- 49 years old, rebuilt 1995
- Condition
- Fair
- inspected May 2024
- Type
- Box Beam or Girders - Single or Spread
- Concrete Continuous
- Length
- 191 ft
- 3 main spans
- Daily traffic
- 12,748
- 2024 count
- Owner
- State
- State Highway Agency
About this bridge
SR 189 over Mariposa Canyon is a concrete continuous box beam or girders - single or spread carrying SR 189 over Mariposa Canyon in Santa Cruz County, Arizona. It was built in 1976 and reconstructed in 1995, so it is 49 years old, older than the Arizona average of 47.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 12,748 vehicles a day, roughly 18% of them trucks, projected to reach 12,758 by 2042. The structure is 191 ft (58.2 m) long and 83 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 | 7 Good | Some minor problems. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 SR 189 over Mariposa Canyon built?
It was built in 1976, making it 49 years old in 2025. It was reconstructed in 1995.
What condition is SR 189 over Mariposa Canyon 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 May 2024.
How much traffic does SR 189 over Mariposa Canyon carry?
About 12,748 vehicles per day (2024 count), of which roughly 18% are trucks.
How long is SR 189 over Mariposa Canyon?
The structure is 191 ft (58.2 m) long with a longest span of 75 ft (22.9 m) and a deck 83 ft wide.
Who owns SR 189 over Mariposa Canyon?
It is owned by the State Highway Agency.