First ST over Hamilton Slough
FairButte County, California · 0.2 MI S/O B ST in Biggs · Structure no. 12C0377
- Built
- 1938
- 87 years old
- Condition
- Fair
- inspected October 2024
- Type
- Tee Beam
- Concrete
- Length
- 22 ft
- 1 main span
- Daily traffic
- 80
- 2019 count
- Owner
- City
- City or Municipal Highway Agency
About this bridge
First ST over Hamilton Slough is a concrete tee beam carrying First ST over Hamilton Slough in Butte County, California. It was built in 1938, 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 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 80 vehicles a day, roughly 2% of them trucks, projected to reach 208 by 2041. The structure is 22 ft (6.7 m) long and 23 ft wide. If it were closed, the detour would be 123.7 mi (199 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 | 7 Good | Some minor problems. |
| Superstructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was First ST over Hamilton Slough built?
It was built in 1938, making it 87 years old in 2025.
What condition is First ST over Hamilton Slough 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 October 2024.
How much traffic does First ST over Hamilton Slough carry?
About 80 vehicles per day (2019 count), of which roughly 2% are trucks.
How long is First ST over Hamilton Slough?
The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 23 ft wide.
Who owns First ST over Hamilton Slough?
It is owned by the City or Municipal Highway Agency.