U.S. Highway 101 over Colma Creek
FairSan Mateo County, California · 04-SM-101-21.61-SSF · Structure no. 35 0118
- Built
- 1947
- 78 years old, rebuilt 1973
- Condition
- Fair
- inspected April 2023
- Type
- Slab
- Concrete Continuous
- Length
- 120 ft
- 5 main spans
- Daily traffic
- 188,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
U.S. Highway 101 over Colma Creek is a concrete continuous slab carrying U.S. Highway 101 over Colma Creek in San Mateo County, California. It was built in 1947 and reconstructed in 1973, so it is 78 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 188,000 vehicles a day, roughly 4% of them trucks, projected to reach 267,887 by 2040. The structure is 120 ft (36.6 m) long and 148 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was U.S. Highway 101 over Colma Creek built?
It was built in 1947, making it 78 years old in 2025. It was reconstructed in 1973.
What condition is U.S. Highway 101 over Colma 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 April 2023.
How much traffic does U.S. Highway 101 over Colma Creek carry?
About 188,000 vehicles per day (2009 count), of which roughly 4% are trucks.
How long is U.S. Highway 101 over Colma Creek?
The structure is 120 ft (36.6 m) long with a longest span of 30 ft (9.1 m) and a deck 148 ft wide.
Who owns U.S. Highway 101 over Colma Creek?
It is owned by the State Highway Agency.