State Route 299 over Mill Creek
GoodHumboldt County, California · 01-HUM-299-R4.21 · Structure no. 04 0188
- Built
- 1965
- 60 years old
- Condition
- Good
- inspected January 2025
- Type
- Slab
- Concrete Continuous
- Length
- 116 ft
- 4 main spans
- Daily traffic
- 9,700
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 299 over Mill Creek is a concrete continuous slab carrying State Route 299 over Mill Creek in Humboldt County, California. It was built in 1965, so it is 60 years old, older than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 9,700 vehicles a day, roughly 17% of them trucks, projected to reach 15,291 by 2043. The structure is 116 ft (35.4 m) long and 94 ft wide. If it were closed, the detour would be 31.1 mi (50 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 299 over Mill Creek built?
It was built in 1965, making it 60 years old in 2025.
What condition is State Route 299 over Mill Creek in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in January 2025.
How much traffic does State Route 299 over Mill Creek carry?
About 9,700 vehicles per day (2009 count), of which roughly 17% are trucks.
How long is State Route 299 over Mill Creek?
The structure is 116 ft (35.4 m) long with a longest span of 33 ft (10.1 m) and a deck 94 ft wide.
Who owns State Route 299 over Mill Creek?
It is owned by the State Highway Agency.