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If you hire a professional landscaper, you could expect to pay between $90 and $660 to install three cubic yards of river rock. (That’s based on the average river rock installation cost of $30 to $220 per cubic yard.) However, the exact price depends on the kind of river rock you choose. Crushed limestone and riprap are some of the more affordable options, while boulders and Arizona river rock are pricier.

The difference between river rock and landscaping rocks is size, smoothness, and use. River rocks are smooth and flat, as if polished by water, and come in diameters between 1 and 8 inches. Landscape rock can vary in size from small pea gravel installations to car-sized boulders. However, landscaping and river rocks are interchangeable in many situations. River rock is best for pathways, walkways, garden bed mulch, water features, and planting accents, while small landscape rocks can serve as a walkway base, gravel playground areas, and filler between pavers.

Yes, gravel comes in different sizes, from fine powder to pea-, coin-, and even golf ball-size. Pea gravel is about 3/8 inch, while crushed stone gravel is about 3/8 to 4 inches. Most companies use a numerical system to assign a size, with the smallest being #10 and the biggest being #1. 

When laying gravel, it's often a good idea to apply a base layer, such as sand or crushed concrete. You may also want to layer a weed-blocking membrane on top of the base layer to prevent weeds and grass from sprouting up in your gravel driveway. Without the appropriate base layer, the gravel you lay may sink into the soil.