Nacimiento Lake DR over San Marcos Creek
FairSan Luis Obispo County, California · 0.05 MI S San Marcos RD · Structure no. 49C0355
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected June 2024
- Type
- Culvert
- Concrete Continuous
- Length
- 82 ft
- 3 main spans
- Daily traffic
- 4,973
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
Nacimiento Lake DR over San Marcos Creek is a concrete continuous culvert carrying Nacimiento Lake DR over San Marcos Creek in San Luis Obispo County, California. It was built in 1964, so it is 61 years old, older 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 4,973 vehicles a day, roughly 3% of them trucks, projected to reach 8,010 by 2044. The structure is 82 ft (25 m) long. If it were closed, the detour would be 23 mi (37 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 |
|---|---|---|
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Culvert | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Nacimiento Lake DR over San Marcos Creek built?
It was built in 1964, making it 61 years old in 2025.
What condition is Nacimiento Lake DR over San Marcos Creek 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 2024.
How much traffic does Nacimiento Lake DR over San Marcos Creek carry?
About 4,973 vehicles per day (2020 count), of which roughly 3% are trucks.
How long is Nacimiento Lake DR over San Marcos Creek?
The structure is 82 ft (25 m) long with a longest span of 26 ft (8 m).
Who owns Nacimiento Lake DR over San Marcos Creek?
It is owned by the County Highway Agency.