WB 4 On-Ramp over Mormon Slough
FairSan Joaquin County, California · 10-SJ-004-R16.20-STKN · Structure no. 29 0238K
- Built
- 1972
- 53 years old
- Condition
- Fair
- inspected June 2023
- Type
- Slab
- Concrete Continuous
- Length
- 132 ft
- 5 main spans
- Daily traffic
- 700
- 2002 count
- Owner
- State
- State Highway Agency
About this bridge
WB 4 On-Ramp over Mormon Slough is a concrete continuous slab carrying WB 4 On-Ramp over Mormon Slough in San Joaquin County, California. It was built in 1972, so it is 53 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 700 vehicles a day, roughly 10% of them trucks, projected to reach 1,117 by 2041. The structure is 132 ft (40.2 m) long and 34 ft wide. If it were closed, the detour would be 1.9 mi (3 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was WB 4 On-Ramp over Mormon Slough built?
It was built in 1972, making it 53 years old in 2025.
What condition is WB 4 On-Ramp over Mormon 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 June 2023.
How much traffic does WB 4 On-Ramp over Mormon Slough carry?
About 700 vehicles per day (2002 count), of which roughly 10% are trucks.
How long is WB 4 On-Ramp over Mormon Slough?
The structure is 132 ft (40.2 m) long with a longest span of 28 ft (8.5 m) and a deck 34 ft wide.
Who owns WB 4 On-Ramp over Mormon Slough?
It is owned by the State Highway Agency.