N15-BALBOA WB Off over I-15 Balboa Murphy Cyn
GoodSan Diego County, California · 11-SD-015-R9.27-SD · Structure no. 57 0879G
- Built
- 1982
- 43 years old
- Condition
- Good
- inspected July 2023
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete Continuous
- Length
- 1,675 ft
- 12 main spans
- Daily traffic
- 12,500
- 2020 count
- Owner
- State
- State Highway Agency
About this bridge
N15-BALBOA WB Off over I-15 Balboa Murphy Cyn is a prestressed concrete continuous box beam or girders - multiple carrying N15-BALBOA WB Off over I-15 Balboa Murphy Cyn in San Diego County, California. It was built in 1982, so it is 43 years old, younger than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 12,500 vehicles a day, roughly 1% of them trucks, projected to reach 12,911 by 2041. The structure is 1,675 ft (510.5 m) long and 39 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| 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 N15-BALBOA WB Off over I-15 Balboa Murphy Cyn built?
It was built in 1982, making it 43 years old in 2025.
What condition is N15-BALBOA WB Off over I-15 Balboa Murphy Cyn in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.
How much traffic does N15-BALBOA WB Off over I-15 Balboa Murphy Cyn carry?
About 12,500 vehicles per day (2020 count), of which roughly 1% are trucks.
How long is N15-BALBOA WB Off over I-15 Balboa Murphy Cyn?
The structure is 1,675 ft (510.5 m) long with a longest span of 167 ft (50.9 m) and a deck 39 ft wide.
Who owns N15-BALBOA WB Off over I-15 Balboa Murphy Cyn?
It is owned by the State Highway Agency.