Choosing the right rock starts with the job you need it to do. Browse road base for driveway and site foundations, drain rock for drainage projects, and Class II permeable base for projects that call for it. This category includes virgin and recycled road base, along with standard drain rock and recycled drain rock. Select a product above to review its details and order by the cubic yard. TerraBay Materials delivers bulk gravel and crushed rock to homes and job sites across Marin, Contra Costa, Alameda, and surrounding Bay Area counties. Delivery availability and fees depend on your address and order. If your project has specific material requirements, check the product details or contact us before ordering.