Orvle Chico HWY over Hamlin Slough
PoorButte County, California · 1.1 MI NW Durham HWY · Structure no. 12C0029
- Built
- 1920
- 105 years old, rebuilt 1975
- Condition
- Poor
- inspected May 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 60 ft
- 3 main spans
- Daily traffic
- 300
- 2018 count
- Owner
- County
- County Highway Agency
About this bridge
Orvle Chico HWY over Hamlin Slough is a steel stringer/multi-beam or girder carrying Orvle Chico HWY over Hamlin Slough in Butte County, California. It was built in 1920 and reconstructed in 1975, so it is 105 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 300 vehicles a day, roughly 14% of them trucks, projected to reach 1,109 by 2046. The structure is 60 ft (18.2 m) long and 28 ft wide. If it were closed, the detour would be 6.2 mi (10 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Orvle Chico HWY over Hamlin Slough built?
It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1975.
What condition is Orvle Chico HWY over Hamlin Slough 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 May 2024.
How much traffic does Orvle Chico HWY over Hamlin Slough carry?
About 300 vehicles per day (2018 count), of which roughly 14% are trucks.
How long is Orvle Chico HWY over Hamlin Slough?
The structure is 60 ft (18.2 m) long with a longest span of 20 ft (6.1 m) and a deck 28 ft wide.
Who owns Orvle Chico HWY over Hamlin Slough?
It is owned by the County Highway Agency.