Old State Route 99 over Miles Creek Overflow
PoorMerced County, California · 0.1 MI Nw/O Healy RD · Structure no. 39C0392
- Built
- 1938
- 87 years old, rebuilt 1987
- Condition
- Poor
- inspected January 2024
- Type
- Slab
- Concrete Continuous
- Length
- 89 ft
- 6 main spans
- Daily traffic
- 270
- 2018 count
- Owner
- County
- County Highway Agency
About this bridge
Old State Route 99 over Miles Creek Overflow is a concrete continuous slab carrying Old State Route 99 over Miles Creek Overflow in Merced County, California. It was built in 1938 and reconstructed in 1987, so it is 87 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 270 vehicles a day, roughly 5% of them trucks, projected to reach 1,044 by 2046. The structure is 89 ft (27.1 m) long and 90 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 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 Old State Route 99 over Miles Creek Overflow built?
It was built in 1938, making it 87 years old in 2025. It was reconstructed in 1987.
What condition is Old State Route 99 over Miles Creek Overflow 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 Old State Route 99 over Miles Creek Overflow carry?
About 270 vehicles per day (2018 count), of which roughly 5% are trucks.
How long is Old State Route 99 over Miles Creek Overflow?
The structure is 89 ft (27.1 m) long with a longest span of 21 ft (6.4 m) and a deck 90 ft wide.
Who owns Old State Route 99 over Miles Creek Overflow?
It is owned by the County Highway Agency.