State Route 1 over Santa Maria River
PoorSan Luis Obispo County, California · 05-SLO-001-0.01 · Structure no. 49 0042
- Built
- 1955
- 70 years old
- Condition
- Poor
- inspected September 2023
- Type
- Tee Beam
- Prestressed Concrete
- Length
- 1,203 ft
- 24 main spans
- Daily traffic
- 5,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 1 over Santa Maria River is a prestressed concrete tee beam carrying State Route 1 over Santa Maria River in San Luis Obispo County, California. It was built in 1955, so it is 70 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 5,000 vehicles a day, projected to reach 11,959 by 2045. The structure is 1,203 ft (366.7 m) long and 33 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 State Route 1 over Santa Maria River built?
It was built in 1955, making it 70 years old in 2025.
What condition is State Route 1 over Santa Maria River 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 September 2023.
How much traffic does State Route 1 over Santa Maria River carry?
About 5,000 vehicles per day (2009 count).
How long is State Route 1 over Santa Maria River?
The structure is 1,203 ft (366.7 m) long with a longest span of 50 ft (15.2 m) and a deck 33 ft wide.
Who owns State Route 1 over Santa Maria River?
It is owned by the State Highway Agency.