US Highway 101 NB over Lytton Springs Road
FairSonoma County, California · 04-SON-101-R38.56 · Structure no. 20 0233R
- Built
- 1974
- 51 years old
- Condition
- Fair
- inspected April 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 163 ft
- 1 main span
- Daily traffic
- 14,250
- 2015 count
- Owner
- State
- State Highway Agency
About this bridge
US Highway 101 NB over Lytton Springs Road is a prestressed concrete box beam or girders - multiple carrying US Highway 101 NB over Lytton Springs Road in Sonoma 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 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 14,250 vehicles a day, roughly 11% of them trucks, projected to reach 27,111 by 2045. The structure is 163 ft (49.7 m) long and 41 ft wide.
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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US Highway 101 NB over Lytton Springs Road built?
It was built in 1974, making it 51 years old in 2025.
What condition is US Highway 101 NB over Lytton Springs Road 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 US Highway 101 NB over Lytton Springs Road carry?
About 14,250 vehicles per day (2015 count), of which roughly 11% are trucks.
How long is US Highway 101 NB over Lytton Springs Road?
The structure is 163 ft (49.7 m) long with a longest span of 161 ft (49.1 m) and a deck 41 ft wide.
Who owns US Highway 101 NB over Lytton Springs Road?
It is owned by the State Highway Agency.