Bulk Rock, Gravel, Sand and Soil Delivery in McAllen, TX

Flat, partly built-over ground at the center point

The USDA survey maps the Hidalgo-Urban land complex, 0 to 1 percent slopes, at the center point of ZIP 78501. In that map unit, 25 percent is urban land, paved or built over, and the Hidalgo series covers 65 percent. A complex like this mixes natural soil with ground that has been graded, filled and covered by streets and slabs, so a test hole is the quickest way to see what sits under a given yard.^[1]

Mixed urban ground shows up in small ways during a dig. A shovel may hit an old slab edge, a pocket of hard fill or a layer of imported sand left from an earlier build. Pull out debris and soft pockets, then compact what remains before any stone goes down. A firm, even subgrade is the best insurance a parking pad can have.^[1]

Where the natural soil remains, its top mineral layer is sandy clay loam, a blend of sand with enough clay to hold together in a ball. The survey rates it well drained, in hydrologic group B with moderate infiltration. The shrink-swell rating for the top 100 cm is low, at 2.7 percent. Taken together, that is friendly ground for building. It compacts well, sheds water at a fair pace and does not shift much between wet and dry spells.^[1]

The ground at the center point lies 120 feet above sea level, and the mapped slopes run from flat to barely tilted. On nearly level land, runoff from a storm has no strong direction to follow. Shaping a gentle fall into every new surface, away from the house and toward the street or a planted area, does the work that a natural slope would do elsewhere.^[1],[2]

Heat, light rain and the rare freeze

The NOAA normals station named McAllen, TX sits about 2 miles away and averages 18.7 inches of precipitation a year, with 0.1 inches of snow. Rain here tends to come in bursts. A stretch of dry weeks can end with a downpour that overwhelms flat yards and gutters. Stone surfaces and mulch protect bare soil from both the baking sun and the sudden flood.^[3]

Freezes are close to absent. The station counts just 1 day a year when the low reaches 32 F or colder. Its median first freeze date is January 1 and its median last freeze date is January 9. Frost heave plays almost no part in planning a base or walkway here. Plan around heat, drainage on flat ground and weeds in the gravel. Weeds sprout fast in warm, damp stone. A woven fabric under every gravel surface and a fresh top-up of stone every few years keep seeds from finding soil to root in.^[3]

Decomposed Granite or Pea Gravel for a patio

Two materials come up again and again for patios and sitting areas here. Decomposed Granite is fine, crushed granite that packs into a firm, tan surface when you wet it and compact it. Chairs and table legs stay level on it, and it handles foot traffic well. Pea Gravel is small, rounded stone that stays loose. It feels soft underfoot, drains instantly and looks relaxed, but chair legs sink and the stones scatter onto nearby lawn.^[1]

On sandy clay loam that drains well, both work over a compacted layer of Road Base. Pick Decomposed Granite where furniture sits and people walk daily, and Pea Gravel for side paths, fire pit rings and play corners. Some yards use both, with a firm Decomposed Granite floor under the table and a soft Pea Gravel border around the edge. Either way, lay landscape fabric under the stone to slow weeds, and add steel or stone edging so the surface keeps its shape. On flat ground, give the patio a slight tilt so a heavy rain runs off instead of puddling.^[1]

Parking pads and drives

Extra parking is a frequent reason to order stone in a busy ZIP. On the well-drained sandy clay loam at the center point, a parking pad can go straight onto compacted native soil once grass and roots are stripped. Spread Road Base or Crushed Concrete in lifts, moisten each one and compact it hard. Finish with 3/4" Crushed Stone, Driveway Gravel or Asphalt Millings. Millings pack into a dark, firm surface that sheds dust and suits a pad beside a street.^[1]

Because the soil sits in group B, rain soaks in at a moderate rate rather than racing off. On level lots, though, the surface still needs a direction. Keep the pad a touch higher than the surrounding yard and give it a slight fall toward a planted strip or the street. A narrow strip of River Rock along the downhill edge catches roof runoff and keeps the pad from washing at the margin.^[1]

Stone around the house in a hot climate

Near walls and foundations, stone works better than mulch or lawn. A band of River Rock or #57 Crushed Stone along the house keeps roof drip from splashing soil onto siding and gives water a clean path away from the slab. Lay a landscape fabric first and slope the soil under it away from the walls. On the well-drained sandy clay loam mapped at the center point, that strip drains quickly after each storm.^[1]

In full sun, pale stone stays cooler to the touch than dark stone, so Decomposed Granite and light crushed rock suit patios and play edges where people walk barefoot. Playground Sand under swings and climbing frames gives a soft landing. For beds, a layer of Brown Shredded Mulch shades roots, and Wood Chips under trees break down slowly into organic matter that sandy clay loam can use.^[3]

Homes in ZIP 78501 and how they compare

There are 25,121 housing units in ZIP 78501 by the Census count, and McAllen holds 55,385 in all. Detached single-family houses make up 55 percent of the ZIP's homes, compared with 64 percent for the city. The ZIP's median home was built in 1986, older than the city median of 1995. Owners live in 49 percent of the occupied homes in the ZIP. Older streets often mean worn drives and borders, and those are easy places to start with a load of stone.^[4]

The Texas Department of Transportation calls the stone layer under its pavements Flexible Base, under Item 247 of its Standard Specifications for Construction and Maintenance of Highways, Streets, and Bridges (2024). That item covers grading and testing for state roads. A driveway or pad at home carries much lighter loads, but the same rule of a compacted, layered base still applies.^[5]