State Route 12 over Little Potato Slough
FairSan Joaquin County, California · 10-SJ-012-R4.44 · Structure no. 29 0101
- Built
- 1991
- 34 years old
- Condition
- Fair
- inspected April 2023
- Type
- Movable - Swing
- Steel Continuous
- Length
- 2,980 ft
- 2 main spans
- Daily traffic
- 15,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 12 over Little Potato Slough is a steel continuous movable - swing carrying State Route 12 over Little Potato Slough in San Joaquin County, California. It was built in 1991, so it is 34 years old, younger 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 15,000 vehicles a day, roughly 14% of them trucks, projected to reach 60,391 by 2041. The structure is 2,980 ft (908.3 m) long and 51 ft wide. If it were closed, the detour would be 19.9 mi (32 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 | 7 Good | Some minor problems. |
| 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 State Route 12 over Little Potato Slough built?
It was built in 1991, making it 34 years old in 2025.
What condition is State Route 12 over Little Potato Slough 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 State Route 12 over Little Potato Slough carry?
About 15,000 vehicles per day (2009 count), of which roughly 14% are trucks.
How long is State Route 12 over Little Potato Slough?
The structure is 2,980 ft (908.3 m) long with a longest span of 160 ft (48.8 m) and a deck 51 ft wide.
Who owns State Route 12 over Little Potato Slough?
It is owned by the State Highway Agency.