Walnut Grove Road over Mokelumne River
PoorSan Joaquin County, California · At Sj & Sac County Line · Structure no. 29C0131
- Built
- 1955
- 70 years old
- Condition
- Poor
- inspected January 2024
- Type
- Movable - Swing
- Steel
- Length
- 238 ft
- 2 main spans
- Daily traffic
- 2,084
- 2015 count
- Owner
- County
- County Highway Agency
About this bridge
Walnut Grove Road over Mokelumne River is a steel movable - swing carrying Walnut Grove Road over Mokelumne River in San Joaquin County, California. It was built in 1955, so it is 70 years old, older 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 2,084 vehicles a day, roughly 10% of them trucks, projected to reach 2,366 by 2042. The structure is 238 ft (72.5 m) long and 25 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 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 | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Walnut Grove Road over Mokelumne River built?
It was built in 1955, making it 70 years old in 2025.
What condition is Walnut Grove Road over Mokelumne River 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 2024.
How much traffic does Walnut Grove Road over Mokelumne River carry?
About 2,084 vehicles per day (2015 count), of which roughly 10% are trucks.
How long is Walnut Grove Road over Mokelumne River?
The structure is 238 ft (72.5 m) long with a longest span of 118 ft (36 m) and a deck 25 ft wide.
Who owns Walnut Grove Road over Mokelumne River?
It is owned by the County Highway Agency.