State Route 128 over Mill Creek
GoodMendocino County, California · 01-MEN-128-17.88 · Structure no. 10 0073
- Built
- 1931
- 94 years old, rebuilt 1973
- Condition
- Good
- inspected May 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 151 ft
- 3 main spans
- Daily traffic
- 3,300
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 128 over Mill Creek is a prestressed concrete stringer/multi-beam or girder carrying State Route 128 over Mill Creek in Mendocino County, California. It was built in 1931 and reconstructed in 1973, so it is 94 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 3,300 vehicles a day, roughly 15% of them trucks, projected to reach 4,700 by 2043. The structure is 151 ft (46 m) long and 34 ft wide. If it were closed, the detour would be 6.8 mi (11 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 | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 128 over Mill Creek built?
It was built in 1931, making it 94 years old in 2025. It was reconstructed in 1973.
What condition is State Route 128 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 May 2023.
How much traffic does State Route 128 over Mill Creek carry?
About 3,300 vehicles per day (2009 count), of which roughly 15% are trucks.
How long is State Route 128 over Mill Creek?
The structure is 151 ft (46 m) long with a longest span of 50 ft (15.2 m) and a deck 34 ft wide.
Who owns State Route 128 over Mill Creek?
It is owned by the State Highway Agency.