Interstate 680 over Blum Road
PoorContra Costa County, California · 04-CC-680-21.52 · Structure no. 28 0172
- Built
- 1962
- 63 years old, rebuilt 2008
- Condition
- Poor
- inspected January 2025
- Type
- Tee Beam
- Concrete Continuous
- Length
- 213 ft
- 4 main spans
- Daily traffic
- 118,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 680 over Blum Road is a concrete continuous tee beam carrying Interstate 680 over Blum Road in Contra Costa County, California. It was built in 1962 and reconstructed in 2008, so it is 63 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 118,000 vehicles a day, roughly 6% of them trucks, projected to reach 185,880 by 2043. The structure is 213 ft (64.9 m) long and 131 ft wide. If it were closed, the detour would be 5 mi (8 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 Interstate 680 over Blum Road built?
It was built in 1962, making it 63 years old in 2025. It was reconstructed in 2008.
What condition is Interstate 680 over Blum Road 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 January 2025.
How much traffic does Interstate 680 over Blum Road carry?
About 118,000 vehicles per day (2009 count), of which roughly 6% are trucks.
How long is Interstate 680 over Blum Road?
The structure is 213 ft (64.9 m) long with a longest span of 60 ft (18.3 m) and a deck 131 ft wide.
Who owns Interstate 680 over Blum Road?
It is owned by the State Highway Agency.