Base Materials 610 Stone

This is base rock that shows up with its own binder built in. It's crushed stone running from about 3/4 inch on down to powdery fines, all mixed together in the same load straight off the crusher. Roll it out, wet it lightly, then run a plate compactor or roller over it and the fines pack into the voids between the bigger chunks. The whole layer sets up hard and stays put under a truck tire. Yards call it a dense-graded aggregate because the gradation leaves almost no gaps for water or shifting.

The 610 number itself comes from state DOT specs, mostly Georgia and the Southeast, where a #610 gradation is written into the road-base standard. Head north or west and the same material shows up under other names: crusher run, ABC (aggregate base course), GAB, DGA, item 4, or 21A. Most yards sell it by the ton and price it between the cheapest fill and a clean-washed #57, usually landing in the $25 to $50 range delivered. It stays cheap because it's a quarry byproduct that doesn't need washing or sizing into a single fraction.