Clay ST / Nave DR over U.S. Highway 101
FairMarin County, California · 04-MRN-101-16.64-NVTO · Structure no. 27 0084
- Built
- 1964
- 61 years old
- Condition
- Fair
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 294 ft
- 3 main spans
- Daily traffic
- 7,310
- 1998 count
- Owner
- State
- State Highway Agency
About this bridge
Clay ST / Nave DR over U.S. Highway 101 is a prestressed concrete continuous stringer/multi-beam or girder carrying Clay ST / Nave DR over U.S. Highway 101 in Marin County, California. It was built in 1964, so it is 61 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 6 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 7,310 vehicles a day, roughly 1% of them trucks, projected to reach 16,086 by 2041. The structure is 294 ft (89.6 m) long and 54 ft wide. If it were closed, the detour would be 2.5 mi (4 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| 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 Clay ST / Nave DR over U.S. Highway 101 built?
It was built in 1964, making it 61 years old in 2025.
What condition is Clay ST / Nave DR over U.S. Highway 101 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 April 2023.
How much traffic does Clay ST / Nave DR over U.S. Highway 101 carry?
About 7,310 vehicles per day (1998 count), of which roughly 1% are trucks.
How long is Clay ST / Nave DR over U.S. Highway 101?
The structure is 294 ft (89.6 m) long with a longest span of 90 ft (27.4 m) and a deck 54 ft wide.
Who owns Clay ST / Nave DR over U.S. Highway 101?
It is owned by the State Highway Agency.