State Route 128 over North Fork Navarro River
FairMendocino County, California · 01-MEN-128-12.68 · Structure no. 10 0078
- Built
- 1953
- 72 years old, rebuilt 1990
- Condition
- Fair
- inspected May 2023
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 228 ft
- 3 main spans
- Daily traffic
- 3,300
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 128 over North Fork Navarro River is a concrete continuous box beam or girders - multiple carrying State Route 128 over North Fork Navarro River in Mendocino County, California. It was built in 1953 and reconstructed in 1990, so it is 72 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 3,300 vehicles a day, roughly 15% of them trucks, projected to reach 4,779 by 2043. The structure is 228 ft (69.5 m) long and 35 ft wide. If it were closed, the detour would be 16.8 mi (27 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 North Fork Navarro River built?
It was built in 1953, making it 72 years old in 2025. It was reconstructed in 1990.
What condition is State Route 128 over North Fork Navarro River 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 2023.
How much traffic does State Route 128 over North Fork Navarro River carry?
About 3,300 vehicles per day (2009 count), of which roughly 15% are trucks.
How long is State Route 128 over North Fork Navarro River?
The structure is 228 ft (69.5 m) long with a longest span of 90 ft (27.4 m) and a deck 35 ft wide.
Who owns State Route 128 over North Fork Navarro River?
It is owned by the State Highway Agency.