Skyway over Magalia Reservoir Spilwy
PoorButte County, California · At Magalia · Structure no. 12C0395
- Built
- 1975
- 50 years old
- Condition
- Poor
- inspected July 2024
- Type
- Box Beam or Girders - Multiple
- Concrete Continuous
- Length
- 160 ft
- 2 main spans
- Daily traffic
- 13,516
- 2020 count
- Owner
- County
- County Highway Agency
About this bridge
Skyway over Magalia Reservoir Spilwy is a concrete continuous box beam or girders - multiple carrying Skyway over Magalia Reservoir Spilwy in Butte 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 13,516 vehicles a day, roughly 10% of them trucks, projected to reach 21,377 by 2041. The structure is 160 ft (48.8 m) long and 34 ft wide. If it were closed, the detour would be 14.9 mi (24 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 | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Skyway over Magalia Reservoir Spilwy built?
It was built in 1975, making it 50 years old in 2025.
What condition is Skyway over Magalia Reservoir Spilwy 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 Skyway over Magalia Reservoir Spilwy carry?
About 13,516 vehicles per day (2020 count), of which roughly 10% are trucks.
How long is Skyway over Magalia Reservoir Spilwy?
The structure is 160 ft (48.8 m) long with a longest span of 79 ft (24.2 m) and a deck 34 ft wide.
Who owns Skyway over Magalia Reservoir Spilwy?
It is owned by the County Highway Agency.