US Highway 101 SB over UP RR & AMTRAK Mission
GoodSan Luis Obispo County, California · 05-SLO-101-R67.71 · Structure no. 49 0078L
- Built
- 1965
- 60 years old, rebuilt 2020
- Condition
- Good
- inspected November 2023
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 224 ft
- 3 main spans
- Daily traffic
- 9,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
US Highway 101 SB over UP RR & AMTRAK Mission is a concrete continuous box beam or girders - multiple carrying US Highway 101 SB over UP RR & AMTRAK Mission in San Luis Obispo County, California. It was built in 1965 and reconstructed in 2020, so it is 60 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 9,000 vehicles a day, roughly 18% of them trucks, projected to reach 22,949 by 2041. The structure is 224 ft (68.3 m) long and 42 ft wide. If it were closed, the detour would be 0.6 mi (1 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| 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 US Highway 101 SB over UP RR & AMTRAK Mission built?
It was built in 1965, making it 60 years old in 2025. It was reconstructed in 2020.
What condition is US Highway 101 SB over UP RR & AMTRAK Mission in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in November 2023.
How much traffic does US Highway 101 SB over UP RR & AMTRAK Mission carry?
About 9,000 vehicles per day (2009 count), of which roughly 18% are trucks.
How long is US Highway 101 SB over UP RR & AMTRAK Mission?
The structure is 224 ft (68.3 m) long with a longest span of 103 ft (31.4 m) and a deck 42 ft wide.
Who owns US Highway 101 SB over UP RR & AMTRAK Mission?
It is owned by the State Highway Agency.