Mount Lassen DR SB over Miller Creek
FairMarin County, California · 0.06 MI N Lucas Valley RD · Structure no. 27C0134
- Built
- 1925
- 100 years old
- Condition
- Fair
- inspected August 2023
- Type
- Slab
- Concrete
- Length
- 30 ft
- 1 main span
- Daily traffic
- 980
- 1973 count
- Owner
- County
- County Highway Agency
About this bridge
Mount Lassen DR SB over Miller Creek is a concrete slab carrying Mount Lassen DR SB over Miller Creek in Marin County, California. It was built in 1925, so it is 100 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 980 vehicles a day, roughly 2% of them trucks, projected to reach 1,308 by 2041. The structure is 30 ft (9.2 m) long and 24 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Mount Lassen DR SB over Miller Creek built?
It was built in 1925, making it 100 years old in 2025.
What condition is Mount Lassen DR SB over Miller 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 August 2023.
How much traffic does Mount Lassen DR SB over Miller Creek carry?
About 980 vehicles per day (1973 count), of which roughly 2% are trucks.
How long is Mount Lassen DR SB over Miller Creek?
The structure is 30 ft (9.2 m) long with a longest span of 29 ft (8.8 m) and a deck 24 ft wide.
Who owns Mount Lassen DR SB over Miller Creek?
It is owned by the County Highway Agency.