Hearn Avenue over U.S. Highway 101 & Ramps
FairSonoma County, California · 04-SON-101-18.49 · Structure no. 20 0176
- Built
- 1957
- 68 years old
- Condition
- Fair
- inspected August 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 232 ft
- 4 main spans
- Daily traffic
- 5,000
- 2014 count
- Owner
- State
- State Highway Agency
About this bridge
Hearn Avenue over U.S. Highway 101 & Ramps is a concrete continuous box beam or girders - multiple carrying Hearn Avenue over U.S. Highway 101 & Ramps in Sonoma County, California. It was built in 1957, so it is 68 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 5,000 vehicles a day, roughly 3% of them trucks, projected to reach 5,397 by 2046. The structure is 232 ft (70.7 m) long and 33 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| 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 Hearn Avenue over U.S. Highway 101 & Ramps built?
It was built in 1957, making it 68 years old in 2025.
What condition is Hearn Avenue over U.S. Highway 101 & Ramps 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 2024.
How much traffic does Hearn Avenue over U.S. Highway 101 & Ramps carry?
About 5,000 vehicles per day (2014 count), of which roughly 3% are trucks.
How long is Hearn Avenue over U.S. Highway 101 & Ramps?
The structure is 232 ft (70.7 m) long with a longest span of 78 ft (23.8 m) and a deck 33 ft wide.
Who owns Hearn Avenue over U.S. Highway 101 & Ramps?
It is owned by the State Highway Agency.