Premium crushed construction aggregates sourced from Contra Costa County quarries.
These high-quality quarry materials are commonly used for driveway base, drainage systems, trench backfill, road construction, retaining walls, and general site work. Each aggregate is produced from durable crushed stone and screened to meet common construction gradations.
Available sizes include quarry dust, washed gravel, drain rock, road base, and large drainage stone, making this material suitable for both contractor projects and residential landscape installations.
Bulk delivery available throughout the North Bay and greater Bay Area.
Available Sizes
The following aggregate sizes are commonly produced at Contra Costa County quarries and are widely used for construction, drainage, and landscaping applications.
1/4" Dust (Quarry Fines)
Fine crushed stone dust commonly used for paver bedding, pathways, synthetic turf base, and surface leveling.
1/4" Washed Gravel
Small clean washed stone used for pipe bedding, drainage layers, decorative ground cover, and utility backfill.
3/8" Drain Rock
Angular washed rock ideal for French drains, trench backfill, underdrain systems, and general drainage applications.
3/4" Road Base
Compacted aggregate base material used for driveways, road construction, paver base, patios, and structural base layers.
3/4" Drain Rock
Clean washed drainage stone commonly used for retaining wall backfill, foundation drains, and subsurface drainage systems.
1.5" Drain Rock
Large drainage rock used for heavy-duty drainage, culverts, erosion control, and large drainage trenches
Other Available Sizes
Additional quarry materials may include:
1/2" Drain Rock
3/4" Permeable Base
3" Drain Rock
3x6" Gabion Rock
4x9" Gabion Rock
9–18" Backing Rip Rap
½ Ton Rip Rap
1 Ton Rip Rap
2 Ton Rip Rap
3+ Ton Rip Rap
Availability may vary depending on quarry production and inventory.
Common Applications
Contra Costa quarry aggregates are widely used in construction, landscaping, drainage, and infrastructure projects throughout the Bay Area. These materials provide structural support, drainage performance, and long-term durability for both residential and commercial installations.
Driveways & Road Base
Compacted aggregates such as 3/4" road base create a strong foundation for gravel driveways, access roads, and paving installations.
Drainage Systems
Washed materials like 3/8", 1/2" and 3/4" drain rock allow water to flow freely, making them ideal for French drains, trench drains, and retaining wall drainage systems.
Paver & Hardscape Base
Fine materials such as 1/4" quarry fines or dust help create a smooth, ready to lay base above sub-base layers for pavers, pathways, patios, and synthetic turf installations.
Foundation & Utility Backfill
Drain rock and washed gravel are commonly used for foundation drainage, pipe bedding, and underground utility installations.
Erosion Control & Heavy Drainage
Larger aggregates such as 1.5" drain rock and rip rap are used for culverts, slope stabilization, creek banks, and stormwater management.
Delivery Areas
North Bay Materials provides bulk aggregate delivery from Contra Costa County quarries to contractors, landscapers, and homeowners throughout the East Bay and North Bay.
Walnut Creek
Concord
Bay Point
Martinez
Lafayette
Berkeley
San Pablo
Pinole
Hercules
Rodeo
These construction aggregates are commonly delivered for driveway installations, drainage systems, road base, trench backfill, retaining walls, and site preparation projects.
Delivery is available for bulk loads depending on material type and project location.
Frequently Asked Questions
What is Contra Costa quarry rock?
Contra Costa quarry rock refers to crushed stone construction aggregates produced from regional quarries and used for road base, drainage, and general construction projects.
What sizes of quarry rock are available?
Common sizes include 1/4" quarry fines, 1/4" washed gravel, 3/8" drain rock, 3/4" road base, 3/4" drain rock, and 1.5" drain rock, along with larger rip rap and gabion stone.
What is quarry rock used for?
Quarry aggregates are commonly used for driveway base, drainage systems, trench backfill, retaining wall drainage, paver base, and road construction.
Do you deliver quarry rock to job sites?
Yes. North Bay Materials provides bulk dump truck delivery to many Bay Area locations including Walnut Creek, Concord, Martinez, Vallejo, Benicia, Berkeley, and American Canyon.
What is the difference between road base and drain rock?
Road base contains a mix of crushed rock and fines that compact tightly, while drain rock is washed stone designed to allow water to flow through for drainage.
Can homeowners order this material or is it contractor only?
Both contractors and homeowners can order bulk aggregates for landscaping, driveways, drainage projects, and site preparation.
Contra Costa Quarry Construction Aggregate (per ton)
call for truck-load volume discounts on 15+ yds
