Interstate 680 over Monument Boulevard
PoorContra Costa County, California · 04-CC-680-R17.70-PLHL · Structure no. 28 0104
- Built
- 1998
- 27 years old
- Condition
- Poor
- inspected January 2025
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 552 ft
- 3 main spans
- Daily traffic
- 235,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
Interstate 680 over Monument Boulevard is a prestressed concrete continuous box beam or girders - multiple carrying Interstate 680 over Monument Boulevard in Contra Costa County, California. It was built in 1998, so it is 27 years old, younger 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 235,000 vehicles a day, roughly 4% of them trucks, projected to reach 381,996 by 2043. The structure is 552 ft (168.3 m) long and 166 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 7 Good | Some minor problems. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Interstate 680 over Monument Boulevard built?
It was built in 1998, making it 27 years old in 2025.
What condition is Interstate 680 over Monument Boulevard 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 Monument Boulevard carry?
About 235,000 vehicles per day (2009 count), of which roughly 4% are trucks.
How long is Interstate 680 over Monument Boulevard?
The structure is 552 ft (168.3 m) long with a longest span of 276 ft (84.1 m) and a deck 166 ft wide.
Who owns Interstate 680 over Monument Boulevard?
It is owned by the State Highway Agency.