State Route 99 NB over Mokelumne Ri Frontage R
PoorSan Joaquin County, California · 10-SJ-099-31.72 · Structure no. 29 0002R
- Built
- 1930
- 95 years old, rebuilt 1987
- Condition
- Poor
- inspected July 2024
- Type
- Tee Beam
- Concrete Continuous
- Length
- 831 ft
- 3 main spans
- Daily traffic
- 29,500
- 2014 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 99 NB over Mokelumne Ri Frontage R is a concrete continuous tee beam carrying State Route 99 NB over Mokelumne Ri Frontage R in San Joaquin County, California. It was built in 1930 and reconstructed in 1987, so it is 95 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 29,500 vehicles a day, roughly 13% of them trucks, projected to reach 45,632 by 2042. The structure is 831 ft (253.3 m) long and 53 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 99 NB over Mokelumne Ri Frontage R built?
It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1987.
What condition is State Route 99 NB over Mokelumne Ri Frontage R 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 July 2024.
How much traffic does State Route 99 NB over Mokelumne Ri Frontage R carry?
About 29,500 vehicles per day (2014 count), of which roughly 13% are trucks.
How long is State Route 99 NB over Mokelumne Ri Frontage R?
The structure is 831 ft (253.3 m) long with a longest span of 54 ft (16.5 m) and a deck 53 ft wide.
Who owns State Route 99 NB over Mokelumne Ri Frontage R?
It is owned by the State Highway Agency.