State Route 99 SB over M Street
GoodMerced County, California · 10-MER-099-14.96-MER · Structure no. 39 0134L
- Built
- 1962
- 63 years old
- Condition
- Good
- inspected April 2024
- Type
- Box Beam or Girders - Multiple
- Concrete
- Length
- 66 ft
- 1 main span
- Daily traffic
- 25,500
- 2019 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 SB over M Street is a concrete box beam or girders - multiple carrying State Route 99 SB over M Street in Merced County, California. It was built in 1962, 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 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 25,500 vehicles a day, roughly 20% of them trucks, projected to reach 38,243 by 2046. The structure is 66 ft (20.1 m) long and 40 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 State Route 99 SB over M Street built?
It was built in 1962, making it 63 years old in 2025.
What condition is State Route 99 SB over M Street 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 April 2024.
How much traffic does State Route 99 SB over M Street carry?
About 25,500 vehicles per day (2019 count), of which roughly 20% are trucks.
How long is State Route 99 SB over M Street?
The structure is 66 ft (20.1 m) long with a longest span of 65 ft (19.8 m) and a deck 40 ft wide.
Who owns State Route 99 SB over M Street?
It is owned by the State Highway Agency.