Undine Road over Middle River
PoorSan Joaquin County, California · 2.1 MI W of Howard RD · Structure no. 29C0109
- Built
- 1975
- 50 years old
- Condition
- Poor
- inspected September 2023
- Type
- Tee Beam
- Concrete Continuous
- Length
- 208 ft
- 3 main spans
- Daily traffic
- 152
- 2013 count
- Owner
- County
- County Highway Agency
About this bridge
Undine Road over Middle River is a concrete continuous tee beam carrying Undine Road over Middle River in San Joaquin County, California. It was built in 1975, so it is 50 years old, younger 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 152 vehicles a day, roughly 10% of them trucks, projected to reach 330 by 2045. The structure is 208 ft (63.4 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Undine Road over Middle River built?
It was built in 1975, making it 50 years old in 2025.
What condition is Undine Road over Middle 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 September 2023.
How much traffic does Undine Road over Middle River carry?
About 152 vehicles per day (2013 count), of which roughly 10% are trucks.
How long is Undine Road over Middle River?
The structure is 208 ft (63.4 m) long with a longest span of 68 ft (20.7 m) and a deck 32 ft wide.
Who owns Undine Road over Middle River?
It is owned by the County Highway Agency.