About this stone

#8 washed gravel: small angular crushed stone perfect for drainage, French drains, and concrete bases.

The driver nailed it on putting the gravel I ordered in front of my trailer and between the sidewalk. Very satisfied with how my flowerbeds look now.

Plan on 2 to 3 inches for decorative ground cover, 3 to 4 inches for high traffic paths and downspout aprons, and 4 to 6 inches of compacted base beneath pavers. One ton of river rock covers roughly 90 to 110 square feet at 3 inches deep.
Use our free stone calculator

A yard is approximately 27 cubic feet. As a general guideline, one yard of material can cover an area of about 100-160 square feet at a 2-3 inch depth.

Centennial Stone Delivery

Centennial Stone Delivery

4.7
137 reviews
Regular price $87.00 per Yard
Regular price Sale price $87.00
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About this stone

#8 washed gravel: small angular crushed stone perfect for drainage, French drains, and concrete bases.

The driver nailed it on putting the gravel I ordered in front of my trailer and between the sidewalk. Very satisfied with how my flowerbeds look now.

Plan on 2 to 3 inches for decorative ground cover, 3 to 4 inches for high traffic paths and downspout aprons, and 4 to 6 inches of compacted base beneath pavers. One ton of river rock covers roughly 90 to 110 square feet at 3 inches deep.
Use our free stone calculator

A yard is approximately 27 cubic feet. As a general guideline, one yard of material can cover an area of about 100-160 square feet at a 2-3 inch depth.

View full details

How It Works

Getting started is easy — just follow these simple steps

1

Choose your stone

Make sure you adjust the quantity to your home's needs. You can use our calculator to estimate how much you'll need.

2

Select your delivery date

Select a delivery date you'd like for the product to be dropped off at your home

3

Sit back and wait

Sit back, wait, and let us work our magic to make sure the highest quality product is delivered to your driveway.

From The Mouths of Centennial Folks

4.7
out of 5 based on 137 reviews
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Need Help Calculating How Much Stone & Gravel You Need?

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Measure the area in square feet, multiply by depth in inches, then divide by 324 for cubic yards. Rock is sold by weight, so multiply cubic yards by roughly 1.4 tons for river rock and cobble. Sketch out irregular Centennial beds and dry creek beds in sections, and add 10 percent for depth variation over uneven clay.

Complete Your Outdoor Stone Project

Add commercial grade weed fabric, steel edging to keep rock off the lawn, and a few yards of squeegee if you are setting flagstone. Boulders and a load of garden mix for xeric plant pockets finish the look nicely.

Mulch Mound Pro Tip

Excavate before you order. Centennial homeowners routinely dump rock on top of existing grade, then spend the next two years sweeping stone off the sidewalk. Dig out 3 to 4 inches so the finished surface sits just below your concrete edges and edging. It costs a Saturday of work but it is the single thing that separates a rock bed that still looks sharp in year five from one that has migrated across the driveway.

Mulch Mound Pro Tip

Match rock size to slope. On the sloped side yards common in Centennial's hillier neighborhoods, three quarter inch rock will creep downhill with every snowmelt and hard rain. Use 2 inch cobble or larger above a 5 percent grade, and anchor the toe of the slope with a row of larger stones or a small boulder. Angular granite also locks together better than smooth river rock on any incline.

Mulch Mound Pro Tip

Leave breathing room for plants. Rock mulch does not feed the soil, so any shrubs or xeric perennials in the bed need a generous pocket of amended soil beneath and a slightly thinner rock layer over their root zones. Keep stone a few inches back from trunks and crowns. Combining a rock field with well prepared planting pockets is how Centennial xeriscapes stay low water without looking like a bare gravel lot.

The Unique Landscape of Centennial

Decorative rock is a Centennial staple because it holds up to everything our climate throws at it, from 40 mph April gusts to intense UV at 5,837 feet to the freeze thaw cycles that run from October through May. With only about 17 inches of precipitation a year, many homeowners here are converting thirsty bluegrass and high maintenance beds into rock and xeric plantings that need almost no supplemental water. Stone also solves real drainage headaches on our clay lots, where roof runoff and snowmelt have nowhere to soak in and instead carve channels through mulch beds. Cobble lined swales, dry creek beds, and rock aprons under downspouts move water away from foundations without washing out every spring. Unlike organic material, rock never needs a yearly refresh, which is a meaningful savings on the large open lots common in Centennial. Choose the right size and color and it can look at home next to both the mature landscapes near Cherry Knolls and the newer builds off Smoky Hill Road.

Frequently Asked Questions

Click a question to see the answer

Answer

How many tons of rock do I need for a typical Centennial park strip?

A standard park strip between the sidewalk and curb in Centennial runs about 4 feet wide by 60 feet long, or 240 square feet. At 3 inches deep that is roughly 2 tons of river rock. Add 10 percent for uneven grade and settling around edging and tree wells.

Answer

Should I put fabric under my rock?

Yes for most Centennial installs. Commercial grade woven fabric keeps rock from sinking into our soft clay, which happens fast during spring thaw. It will not stop every weed, since wind blown dirt collects on top and seeds germinate in that layer, but it dramatically reduces what comes up from below and makes the rock far easier to remove later if you change plans.

Answer

Does rock make my yard hotter in the summer?

It does radiate heat, and on a south or west facing Centennial exposure a rock bed can run 10 to 15 degrees warmer than mulch at the surface. Use lighter colored granite or river rock in those spots rather than dark cobble, and keep rock beds away from the walls of the house where reflected heat stresses shrubs and raises cooling costs.

Answer

What size rock works best under my downspouts?

Go with 2 to 4 inch river rock or cobble at downspouts and roof drip lines. Smaller three quarter inch rock scatters when a Centennial cloudburst dumps an inch in twenty minutes. Extend the rock apron at least 4 feet from the foundation and set it over fabric with a slight fall away from the house.

Answer

Can I put rock right over my existing grass?

Not successfully. Centennial bluegrass and bindweed will push right through fabric and rock if the turf is still alive. Kill or strip the sod first, excavate 3 to 4 inches so the finished rock sits flush with your sidewalk, then lay fabric and rock. Skipping the excavation is the most common reason rock beds spill onto walkways.

Answer

What do I use for a base under a paver patio or flagstone?

Use 4 to 6 inches of compacted class 6 road base topped with about an inch of squeegee for setting. Centennial's freeze thaw cycle is hard on patios, so proper compaction in 2 inch lifts and a slope of a quarter inch per foot away from the house are what keep flagstone from heaving by the third winter.

Answer

How do I keep weeds out of an established rock bed?

Blow or rake out the leaves and silt that accumulate each fall, since that organic layer is what weeds actually root in. A spring pre emergent applied around April, before soil temperatures climb, prevents most annual weeds in Centennial rock beds. Spot treat bindweed and thistle as they appear rather than letting them set seed.