Ignacio Boulevard over U.S. Highway 101
PoorMarin County, California · 04-MRN-101-18.09-NVTO · Structure no. 27 0083
- Built
- 1964
- 61 years old
- Condition
- Poor
- inspected April 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete Continuous
- Length
- 268 ft
- 3 main spans
- Daily traffic
- 12,900
- 1998 count
- Owner
- State
- State Highway Agency
About this bridge
Ignacio Boulevard over U.S. Highway 101 is a prestressed concrete continuous stringer/multi-beam or girder carrying Ignacio Boulevard 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
It carries about 12,900 vehicles a day, roughly 1% of them trucks, projected to reach 51,990 by 2041. The structure is 268 ft (81.7 m) long and 92 ft wide. If it were closed, the detour would be 3.1 mi (5 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 4 Poor | Advanced section loss, deterioration, 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 Ignacio Boulevard over U.S. Highway 101 built?
It was built in 1964, making it 61 years old in 2025.
What condition is Ignacio Boulevard over U.S. Highway 101 in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2023.
How much traffic does Ignacio Boulevard over U.S. Highway 101 carry?
About 12,900 vehicles per day (1998 count), of which roughly 1% are trucks.
How long is Ignacio Boulevard over U.S. Highway 101?
The structure is 268 ft (81.7 m) long with a longest span of 75 ft (22.9 m) and a deck 92 ft wide.
Who owns Ignacio Boulevard over U.S. Highway 101?
It is owned by the State Highway Agency.