State Route 140 over Slate Gulch
PoorMariposa County, California · 10-MPA-140-37.09 · Structure no. 40 0006
- Built
- 1926
- 99 years old
- Condition
- Poor
- inspected July 2024
- Type
- Arch - Deck
- Concrete
- Length
- 49 ft
- 1 main span
- Daily traffic
- 1,400
- 2009 count
- Owner
- State
- State Highway Agency
About this bridge
State Route 140 over Slate Gulch is a concrete arch - deck carrying State Route 140 over Slate Gulch in Mariposa County, California. It was built in 1926, so it is 99 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 1,400 vehicles a day, roughly 5% of them trucks, projected to reach 1,172 by 2046. The structure is 49 ft (14.9 m) long and 29 ft wide. If it were closed, the detour would be 73.9 mi (119 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 |
|---|---|---|
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was State Route 140 over Slate Gulch built?
It was built in 1926, making it 99 years old in 2025.
What condition is State Route 140 over Slate Gulch 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 140 over Slate Gulch carry?
About 1,400 vehicles per day (2009 count), of which roughly 5% are trucks.
How long is State Route 140 over Slate Gulch?
The structure is 49 ft (14.9 m) long with a longest span of 49 ft (14.9 m) and a deck 29 ft wide.
Who owns State Route 140 over Slate Gulch?
It is owned by the State Highway Agency.