Grizzley Island RD over Hill Slough
GoodSolano County, California · 1.3 MI S RTE 12 · Structure no. 23C0262
- Built
- 2009
- 16 years old
- Condition
- Good
- inspected August 2024
- Type
- Slab
- Prestressed Concrete
- Length
- 189 ft
- 7 main spans
- Daily traffic
- 642
- 2010 count
- Owner
- County
- County Highway Agency
About this bridge
Grizzley Island RD over Hill Slough is a prestressed concrete slab carrying Grizzley Island RD over Hill Slough in Solano County, California. It was built in 2009, so it is 16 years old, younger than the California average of 54.8 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
It carries about 642 vehicles a day, roughly 2% of them trucks, projected to reach 716 by 2042. The structure is 189 ft (57.6 m) long and 32 ft wide. If it were closed, the detour would be 123.7 mi (199 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 8 Very Good | No problems noted. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Grizzley Island RD over Hill Slough built?
It was built in 2009, making it 16 years old in 2025.
What condition is Grizzley Island RD over Hill Slough in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2024.
How much traffic does Grizzley Island RD over Hill Slough carry?
About 642 vehicles per day (2010 count), of which roughly 2% are trucks.
How long is Grizzley Island RD over Hill Slough?
The structure is 189 ft (57.6 m) long with a longest span of 27 ft (8.2 m) and a deck 32 ft wide.
Who owns Grizzley Island RD over Hill Slough?
It is owned by the County Highway Agency.