Bulk Gravel and Stone Delivery in Marin County, CA

Winter rain drives the work here. It soaks into sandy shoreline ground fast, then sits on the clay that runs through the Coast Range valleys and hills. Gravel, stone and aggregate delivery in Marin County, CA starts with that split. California Rock Supply sells Class 2 base and clean drainage stone built for it.

Order online, size the load, and we deliver to the job site.

Ground Conditions Across Marin County

Soils change over short distances. Sandy dune and beach soils sit along parts of the shoreline. Heavy clay soils that crack when dry and swell when wet are extensive in the Coast Range valleys and hills. Two driveways a mile apart can need two different base plans.

Clay moves. It swells when wet, shrinks when dry, and pushes an under-built base out of shape. Excavate deeper, compact in lifts, and use a minimum depth of 4 inches of base under a drive. Sand drains fast but shifts, so it needs confinement at the edges.

Most rain falls from late fall to spring, much of it in a few large winter storms and atmospheric rivers. Water runs off clay and slopes instead of soaking in. That runoff is why drainage layers and slope protection matter here, not just base depth.

Hillside runoff and slides on steep slopes are the winter risk. Intense rain on recently burned slopes can move debris. Storm waves cut at sea cliffs and bluffs along the shoreline.

The dry season from late spring into fall is the main window for base, driveway and paver work. Summer fog is common near the shore. Winter rain and saturated clay hold jobs up.

Materials Delivered in Marin County

Order by project type. The list below covers what most Marin jobs call for, named the way local buyers ask for it.

Class 2 base, the local standard

Class 2 base is the base material California buyers order first. It is specified by Caltrans Standard Specifications Section 26 as Class 2 or Class 3 aggregate base, at 3/4 inch or 1-1/2 inch maximum grading. Class 2 is the higher-strength grade and the common base under drives, pads and pavers. Class 3 is the lower-strength grade.

Local names vary. Class II base, class 2 aggregate base and base rock all mean the same thing. Recycled base rock, recycled class 2 base and crushed miscellaneous base, or CMB, describe Class 2 base made from Road Base or asphalt. Caltrans allows processed reclaimed asphalt and concrete in aggregate base, which is why recycled Class 2 base sells widely here.

Crusher run does the same binding job where you want a compacting material. California buyers more often ask for Class 2 base for the same work.

Stone and sand for the rest of the job

• 3/4" Drain Rock, also called #57 stone, for French drains, drainage trenches and drainage layers.
• 3/4" Crushed Stone for drainage beds, drive surfacing and construction entrances.
• 3/8" Crushed Stone for fine drainage, pipe bedding and topping over a compacted base.
• Mason Sand for brick and block work, paver joints and play sand.
• Washed Sand for leveling, bedding and base under slabs.
• River Cobble for decorative beds, borders and dry creek beds.
• Natural Pea Gravel for play areas, walkways, drainage and bedding.
• Fill Dirt for raising grade and building up pads before base goes down.

Delivery Across Marin County

Order online and pick your material and quantity. Size the load by the ton or the cubic yard, then check the depth you need against the area. Bulk delivery arrives as one full load, tipped where you want it.

Know your access before the truck rolls. Width, overhead clearance and turning room decide where a bulk load can go, and steep shared drives need a plan for placement. Measure the drop spot, not just the gate.

We deliver across the county. Coverage includes San Rafael, Novato, Mill Valley, Larkspur, San Anselmo, Corte Madera, Tiburon, Fairfax, Sausalito, Inverness, Bolinas, Point Reyes Station, Stinson Beach and Nicasio.

Choosing the Right Material

Marin County sits in the Coast and Coast Ranges ground zone. Soils change over short distances: sandy dune and beach soils along parts of the shoreline, heavy clay through the Coast Range valleys and hills. Contra Costa County shares that same zone, so the ground is similar. The projects differ more than the soil does, with more flat pads and long drives needing deep Class 2 base.

San Francisco County shares the zone too, and its ground is similar. Tighter lots and smaller footprints there shift the choice toward drainage and bedding stone over long base runs.

Sonoma County also shares the zone, so the ground is similar again. Larger parcels and rural drives tend to pull the choice toward more Class 2 base and more riprap for slope and creek bank work.

Same ground, different jobs. Read the site, then pick the material.

Questions from Marin County buyers

When is the best time of year to order base material in Marin County?

The dry season, from late spring into fall, is the main window for base, driveway and paver work. Winter rain and saturated clay hold jobs up, so order before the fall storms arrive and schedule placement on dry ground. Summer fog near the shore is common but does not stop compaction the way standing water does.

What is the difference between topsoil and fill dirt?

Fill dirt is structural fill. It raises grade, backfills and builds up a pad before Class 2 base goes down. Topsoil is the planting layer, screened and blended for lawns and beds over clay, hardpan or sandy native soil. Keep them separate: fill dirt compacts, topsoil feeds roots.

What is Class 2 base and what is it used for in Marin County?

Class 2 base is the standard California base material, specified by Caltrans as Class 2 aggregate base at 3/4 inch or 1-1/2 inch maximum grading. It is the higher-strength grade, ordered for driveways, parking pads and the compacted base under pavers, slabs and Stone Screenings paths. Local buyers also call it Class II base or base rock.

Order Class 2 Base and Drainage Stone for Your Marin County Job

Class 2 base is the material most Marin County jobs start with. It carries drives, pads and pavers, and it holds up where clay moves under the surface. Pair it with clean drain rock or riprap where water needs somewhere to go. Order online, size the load, and let California Rock Supply deliver it to your site.