State Route 120 over Alkali Creek
FairTuolumne County, California · 10-TUO-120-11.29 · Structure no. 32 0034
- Built
- 1914
- 111 years old, rebuilt 1958
- Condition
- Fair
- inspected September 2023
- Type
- Slab
- Concrete Continuous
- Length
- 22 ft
- 2 main spans
- Daily traffic
- 16,000
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 120 over Alkali Creek is a concrete continuous slab carrying State Route 120 over Alkali Creek in Tuolumne County, California. It was built in 1914 and reconstructed in 1958, so it is 111 years old, older 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 16,000 vehicles a day, roughly 10% of them trucks, projected to reach 21,022 by 2045. The structure is 22 ft (6.7 m) long. If it were closed, the detour would be 26.7 mi (43 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 | 7 Good | Some minor problems. |
| Channel and channel protection | 9 Excellent | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 120 over Alkali Creek built?
It was built in 1914, making it 111 years old in 2025. It was reconstructed in 1958.
What condition is State Route 120 over Alkali Creek 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 September 2023.
How much traffic does State Route 120 over Alkali Creek carry?
About 16,000 vehicles per day (2009 count), of which roughly 10% are trucks.
How long is State Route 120 over Alkali Creek?
The structure is 22 ft (6.7 m) long with a longest span of 10 ft (3.1 m).
Who owns State Route 120 over Alkali Creek?
It is owned by the State Highway Agency.