Gravel, Rock, Sand and Soil Delivery in Aurora, CO

Weld silt loam on the high plains

The soil survey maps the center point of ZIP 80010 as Weld silt loam on 0 to 3 percent slopes. The Weld series makes up 80 percent of that map unit. Its top mineral layer is silt loam, a fine, dusty soil when dry and a slick one when wet.^[1]

The survey rates Weld soil well drained, but its hydrologic group is C, with slow infiltration. A quick summer storm can run across the surface before much of it sinks in. On a gentle grade like this one, that runoff gathers along fences, walks and driveways.^[1]

Shrink-swell in the top 100 cm is high, at 7.7 percent linear extensibility. Clay in the subsoil swells when it gets wet and shrinks back as it dries. Patios and walks laid over it can tilt and crack over the years, so a flexible, well-drained gravel base is a sound choice here.^[1]

The ground at the center point sits 5,380 feet above sea level. Dry air and strong sun can dry out exposed soil quickly after a storm, so beds benefit from mulch and paths from a binding surface.^[2]

Silt loam on the plains packs hard when dry and turns to mud when wet. Dig and grade it when it is slightly damp, so it holds its shape and compacts well. A spray of water the day before helps on a dry week.^[1]

Before any dig, call to have buried utility lines marked, and keep the spoil pile on a tarp so the fine silt does not wash into the street with the next storm.^[1]

Snow, sun and a long cold season

The NOAA station at Denver-Stapleton, about 2 miles away, supplies the local normals. It averages 15.4 inches of precipitation a year and 49.0 inches of snow. Snow is a big part of the yearly moisture, and it melts in pulses after each storm, soaking the ground near drives and walks where it is piled.^[3]

Stapleton logs 156 days a year with a low of 32 F or colder. Its median last spring freeze comes on May 4, and its median first fall freeze on October 8. Many nights freeze and many days thaw, and on swelling silt loam that cycle can push stones up and loosen pavers. A base that sheds water quickly limits the damage.^[3]

Plows and shovels push loose gravel off a drive with every storm. A crowned, well-packed surface with some binding fines loses less stone, and edging along the sides keeps what moves from ending up in the lawn.^[3]

Spring is the wettest part of the year at many plains stations, with heavy, wet snow and spring rain arriving together. Projects planned for spring should leave time for the ground to dry out before any compaction starts.^[3]

A driveway built for swelling soil and snow

Start by stripping the sod and the soft top layer, then lay a woven geotextile over the silt loam. The fabric keeps the base from mixing with the soil as it swells and shrinks, and it spreads the load of a car across a wider area.^[1]

Road Base is a strong choice for the main layer. Spread it in thin lifts, wet each one and compact it hard. A dry base will not bind in dry, sunny weather, so plan on water during compaction. Asphalt Millings make another firm, dark option that packs well and sheds snowmelt.^[2],[3]

Top the drive with 3/4" Crushed Stone or Driveway Gravel. Crown the surface so meltwater runs to the edges, and leave room at the sides for snow to pile without blocking the runoff. A strip of Drain Rock along the low side gives melt a place to soak in away from the base.^[1],[3]

Pads for trailers, campers and extra cars are common on suburban lots. These need the same base as a drive, though a lower layer of 1-1/2" Crushed Gravel adds strength for heavy loads that sit in one place for months.^[1]

Asphalt Millings deserve a closer look for snowy drives. They pack into a dark, firm surface that warms in the sun, which helps snow and ice melt off sooner after a storm. Compact them in thin lifts like any base, and they bind tighter as warm days soften the old asphalt.^[3]

Water-wise beds and rock gardens

With modest yearly precipitation, many yards here mix planting beds with rock. River Rock, Decomposed Granite and 3/8" Crushed Stone make low-water ground covers that look clean all year. Lay them over fabric to keep weeds from coming through.^[2],[3]

For beds that will be planted, mix Compost into the silt loam to give it better structure and help it take in water. Raised beds of Garden Soil warm up sooner in spring, which helps when the median last freeze does not come until early May.^[1],[3]

Mulch keeps moisture in and protects roots through cold snaps. Brown Shredded Mulch and Wood Chips are common choices. Spread it after the soil warms in spring and top it up before the first hard freeze in the fall.^[3]

Downspouts on this slow-draining soil should empty onto a splash pad of River Rock or into a trench of Drain Rock that leads well away from the foundation. Water that soaks in beside a house on swelling clay can raise the ground against the walls.^[1]

Paths through a xeriscape bed look best in a material that matches the rock around them. Decomposed Granite packed over a thin base makes a firm, smooth path, while Pea Gravel gives a softer, looser feel underfoot. Edging keeps both from spreading into the beds.^[3]

Housing in ZIP 80010 and Aurora

ZIP 80010 holds 15,410 housing units by Census count. Detached single-family houses make up 51 percent of them, close to the 53 percent share for Aurora as a whole.^[4]

The median home here was built in 1964, older than the citywide median of 1985. Owners live in 40 percent of the occupied homes in the ZIP, and Aurora has 152,377 housing units in total. Older homes may need a refresh of worn driveways, cracked walks and tired beds.^[4]

Many of these older homes have narrow side yards and long back fences where grass struggles. A strip of fabric under River Rock or 3/8" Crushed Stone turns those areas into low-care spaces that handle snow and sun alike.^[4]

The Colorado Department of Transportation calls for Aggregate Base Course, Class 6, in Section 304 of its Standard Specifications for Road and Bridge Construction 2025. That section is written for state road work. It is a good model of a dense, graded layer packed in lifts under a road surface.^[5]