Old 99W over Petroleum Creek
FairColusa County, California · 2.2 MI N Yolo CO Line · Structure no. 15C0042
- Built
- 1936
- 89 years old
- Condition
- Fair
- inspected October 2023
- Type
- Slab
- Concrete Continuous
- Length
- 38 ft
- 2 main spans
- Daily traffic
- 1,616
- 2014 count
- Owner
- County
- County Highway Agency
About this bridge
Old 99W over Petroleum Creek is a concrete continuous slab carrying Old 99W over Petroleum Creek in Colusa County, California. It was built in 1936, so it is 89 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 1,616 vehicles a day, roughly 10% of them trucks, projected to reach 2,030 by 2042. The structure is 38 ft (11.7 m) long and 37 ft wide. If it were closed, the detour would be 7.5 mi (12 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 | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old 99W over Petroleum Creek built?
It was built in 1936, making it 89 years old in 2025.
What condition is Old 99W over Petroleum 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 October 2023.
How much traffic does Old 99W over Petroleum Creek carry?
About 1,616 vehicles per day (2014 count), of which roughly 10% are trucks.
How long is Old 99W over Petroleum Creek?
The structure is 38 ft (11.7 m) long with a longest span of 18 ft (5.5 m) and a deck 37 ft wide.
Who owns Old 99W over Petroleum Creek?
It is owned by the County Highway Agency.