Diablo Aggregate Plant

With more than 130 years of experience serving contractors, concrete producers, paving companies, and public agencies, CalPortland provides high-quality aggregates backed by technical expertise, reliable logistics, and sustainable resource management.

What you can expect from CalPortland:

• Proven Expertise – Decades of experience producing aggregates for everything from residential projects to major infrastructure and highway construction.
• Quality Assurance – Consistent gradation, rigorous testing, and compliance with ASTM and project-specific specifications.
• Technical Support – Knowledgeable materials specialists available to help with mix compatibility, performance needs, and project requirements.
• Reliable Supply & Logistics – Strategically located quarries, truck and barge distribution, and dependable inventory management.
• Broad Product Selection – Full lines of crushed stone, concrete sand, masonry sand, gravel, and specialty high-performance aggregates.
• Sustainable Materials Leadership – Pioneering recycled aggregate solutions to reduce waste and conserve natural resources.
  • The Diablo Aggregate plant achieved the U.S. Environmental Protection Agency’s (EPA’s) ENERGY STAR® Challenge for Industry. The ENERGY STAR® Challenge for Industry recognizes plants that achieve a 10% reduction in energy intensity within five years.

Partnering with CalPortland means consistent, high-quality aggregates delivered with technical confidence and operational reliability.