US Highway 101 SB over Santa Margarita Creek
PoorSan Luis Obispo County, California · 05-SLO-101-37.99 · Structure no. 49 0153L
- Built
- 1956
- 69 years old, rebuilt 2012
- Condition
- Poor
- inspected May 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 170 ft
- 4 main spans
- Daily traffic
- 21,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
US Highway 101 SB over Santa Margarita Creek is a concrete continuous tee beam carrying US Highway 101 SB over Santa Margarita Creek in San Luis Obispo County, California. It was built in 1956 and reconstructed in 2012, so it is 69 years old, older 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 21,000 vehicles a day, roughly 8% of them trucks, projected to reach 39,892 by 2043. The structure is 170 ft (51.8 m) long and 42 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US Highway 101 SB over Santa Margarita Creek built?
It was built in 1956, making it 69 years old in 2025. It was reconstructed in 2012.
What condition is US Highway 101 SB over Santa Margarita 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 May 2023.
How much traffic does US Highway 101 SB over Santa Margarita Creek carry?
About 21,000 vehicles per day (2009 count), of which roughly 8% are trucks.
How long is US Highway 101 SB over Santa Margarita Creek?
The structure is 170 ft (51.8 m) long with a longest span of 43 ft (13.1 m) and a deck 42 ft wide.
Who owns US Highway 101 SB over Santa Margarita Creek?
It is owned by the State Highway Agency.