Atherton Avenue over Ncrra (old Nwp Rr)
GoodMarin County, California · 04-MRN-101-R22.04-NVTO · Structure no. 27 0104Y
- Built
- 1974
- 51 years old
- Condition
- Good
- inspected June 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 117 ft
- 1 main span
- Daily traffic
- 8,800
- 2000 count
- Owner
- State
- State Highway Agency
About this bridge
Atherton Avenue over Ncrra (old Nwp Rr) is a prestressed concrete box beam or girders - multiple carrying Atherton Avenue over Ncrra (old Nwp Rr) in Marin County, California. It was built in 1974, so it is 51 years old, younger 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 8,800 vehicles a day, roughly 1% of them trucks, projected to reach 10,831 by 2041. The structure is 117 ft (35.7 m) long and 93 ft wide.
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. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Atherton Avenue over Ncrra (old Nwp Rr) built?
It was built in 1974, making it 51 years old in 2025.
What condition is Atherton Avenue over Ncrra (old Nwp Rr) 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 June 2023.
How much traffic does Atherton Avenue over Ncrra (old Nwp Rr) carry?
About 8,800 vehicles per day (2000 count), of which roughly 1% are trucks.
How long is Atherton Avenue over Ncrra (old Nwp Rr)?
The structure is 117 ft (35.7 m) long with a longest span of 115 ft (35.1 m) and a deck 93 ft wide.
Who owns Atherton Avenue over Ncrra (old Nwp Rr)?
It is owned by the State Highway Agency.