State Route 99 over Mill Creek
FairTehama County, California · 02-TEH-099-13.33 · Structure no. 08 0160
- Built
- 2004
- 21 years old
- Condition
- Fair
- inspected May 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 264 ft
- 3 main spans
- Daily traffic
- 6,800
- 2015 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 over Mill Creek is a prestressed concrete continuous box beam or girders - multiple carrying State Route 99 over Mill Creek in Tehama County, California. It was built in 2004, so it is 21 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 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 6,800 vehicles a day, roughly 13% of them trucks, projected to reach 8,249 by 2046. The structure is 264 ft (80.5 m) long and 56 ft wide. If it were closed, the detour would be 26.1 mi (42 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 | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 over Mill Creek built?
It was built in 2004, making it 21 years old in 2025.
What condition is State Route 99 over Mill 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 May 2024.
How much traffic does State Route 99 over Mill Creek carry?
About 6,800 vehicles per day (2015 count), of which roughly 13% are trucks.
How long is State Route 99 over Mill Creek?
The structure is 264 ft (80.5 m) long with a longest span of 102 ft (31 m) and a deck 56 ft wide.
Who owns State Route 99 over Mill Creek?
It is owned by the State Highway Agency.