Old 99W over South Branch Brush Creek
FairColusa County, California · 3.0 MI N of CO Line · Structure no. 15C0043
- Built
- 1920
- 105 years old, rebuilt 1936
- Condition
- Fair
- inspected October 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 43 ft
- 2 main spans
- Daily traffic
- 2,018
- 2014 count
- Owner
- County
- County Highway Agency
About this bridge
Old 99W over South Branch Brush Creek is a concrete continuous tee beam carrying Old 99W over South Branch Brush Creek in Colusa County, California. It was built in 1920 and reconstructed in 1936, so it is 105 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 2,018 vehicles a day, roughly 10% of them trucks, projected to reach 2,324 by 2042. The structure is 43 ft (13.1 m) long and 37 ft wide. If it were closed, the detour would be 3.7 mi (6 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Old 99W over South Branch Brush Creek built?
It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1936.
What condition is Old 99W over South Branch Brush 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 South Branch Brush Creek carry?
About 2,018 vehicles per day (2014 count), of which roughly 10% are trucks.
How long is Old 99W over South Branch Brush Creek?
The structure is 43 ft (13.1 m) long with a longest span of 20 ft (6.1 m) and a deck 37 ft wide.
Who owns Old 99W over South Branch Brush Creek?
It is owned by the County Highway Agency.