Old HWY 99 over Willow Creek
FairSiskiyou County, California · 1.0 MI S Gazelle-Callahan · Structure no. 02C0203
- Built
- 1994
- 31 years old
- Condition
- Fair
- inspected June 2023
- Type
- Slab
- Concrete Continuous
- Length
- 74 ft
- 3 main spans
- Daily traffic
- 1,005
- 2011 count
- Owner
- County
- County Highway Agency
About this bridge
Old HWY 99 over Willow Creek is a concrete continuous slab carrying Old HWY 99 over Willow Creek in Siskiyou County, California. It was built in 1994, so it is 31 years old, younger 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 6 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 1,005 vehicles a day, roughly 40% of them trucks, projected to reach 1,527 by 2041. The structure is 74 ft (22.6 m) long and 29 ft wide. If it were closed, the detour would be 8.1 mi (13 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Old HWY 99 over Willow Creek built?
It was built in 1994, making it 31 years old in 2025.
What condition is Old HWY 99 over Willow 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 2023.
How much traffic does Old HWY 99 over Willow Creek carry?
About 1,005 vehicles per day (2011 count), of which roughly 40% are trucks.
How long is Old HWY 99 over Willow Creek?
The structure is 74 ft (22.6 m) long with a longest span of 24 ft (7.3 m) and a deck 29 ft wide.
Who owns Old HWY 99 over Willow Creek?
It is owned by the County Highway Agency.