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The average cost of a gravel driveway is about $1.25 to $2.00 per square foot, including materials, equipment, and professional installation. For example, a 1-car, 20-foot-long driveway (240 sq ft) might cost $300–$432, while a 2-car, 50-foot-long driveway (1,200 sq ft) could cost $1,500–$2,160. Key cost factors include the type and thickness of the gravel, the amount of site preparation required, the condition of the landscape, local labor costs, and job site accessibility.

While they’re popular and have a lot of pros, the cons of river rocks include the following:

• River rocks don’t break down or provide nutrients to plants. 

• These stones can get hot and scorch nearby plants. 

• River stones may heat the surrounding soil to inhospitable temperatures. 

• Rocks can block rainwater from seeping into the ground if installations are too thick or tightly packed.

Most downsides occur when using river rock as mulch in gardens and flower beds. However, you can still incorporate river rocks into your landscape as long as you use them in the correct ways.

A good gravel driveway should be built in layers using different sizes of gravel. A solid base layer of larger crushed stone (around 1 to 6 inches in diameter) provides stability and helps with drainage. Some recommend a middle layer of medium-sized gravel (2 to 3 inches). For the top driving surface, smaller gravel is best. A common recommendation is to use gravel between 1/4 inch and 1 inch in diameter, as it compacts well to create an even surface that's easy to drive on. Avoid stones that are too large, flat, or round to ensure the best traction. Using different layers ensures the driveway is durable, drains properly, and doesn't shift over time.

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.