Bridge-Grade Timber
Built for Load-Bearing Performance
Timber bridges demand the highest structural performance — high bending strength, high shear resistance, dimensional consistency, and species documentation for engineering review.
Coast Douglas Fir is one of the few species specifically referenced in AASHTO LRFD Bridge Design Specifications. Its strength-to-weight ratio, availability in large cross-sections, and documented design values make it the default choice for timber bridge contractors across North America.
We supply bridge contractors with stringers, decking, bents, and pile caps in the large dimensions that your distributor can't source — 8x8 to 30x30 and lengths to 60 ft.
Common Bridge Timber Sizes
| Size | Application |
|---|---|
| 12x12 | Primary stringers, bents |
| 12x16 | Heavy stringers |
| 14x14 | Main bents, caps |
| 16x16 | Heavy bents, pile caps |
| 18x18 | Major span stringers |
| 20x20 | Large-span primary members |
| 24x24 | Extreme-load applications |
| 30x30 | Heavy-load primary members |
| 30x30 | Extreme-load — on request |
SAM.gov Registration
Washington Timber Company is pursuing SAM.gov registration for federal contract eligibility. Contact us regarding state DOT approved vendor status for your project requirements.