Gridley Colusa HWY over Grain Slough
Fair Condition87 years old1,139 vehicles/day
Location
| State | California |
| County | Butte |
| Location | 0.4 Mi E/o Colusa Co Line |
| Carries | Gridley Colusa HWY |
| Crosses | Grain Slough |
| Coordinates | 39.36189, -121.88580 |
Condition Ratings
| Overall Condition | Fair |
| Channel/Waterway | 6 (Satisfactory) |
| Culvert | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Culvert |
| Total Length | 26.9 ft (8.2 m) |
| Max Span | 13.1 ft (4 m) |
| Deck Width | 33.1 ft (10.1 m) |
| Deck Area | 82.8 sq m |
| Main Spans | 2 |
| Year Built | 1939 (reconstructed 1958) |
Traffic
| Avg Daily Traffic | 1,139 (2019) |
| Truck Traffic | 31% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 12C0219 |