Gravel, Stone and Soil Delivery in Pueblo, CO

Limon silty clay loam on young river deposits

The USDA soil survey maps Limon silty clay loam, 0 to 2 percent slopes, at the center point of ZIP 81001. Limon accounts for 95 percent of the map unit, so its ratings describe the spot very closely.^[1]

The top mineral layer is silty clay loam, a heavy, fine-grained soil. Shrink-swell in the top 100 cm is rated high, at 7.5 percent linear extensibility. Soil like that can lift a slab or a walk when it soaks up water and drop it again as it dries, and the movement shows first where moisture changes fastest.^[1]

A Limon profile is heavy from the top down, with no sandy layer to dig into for drainage. Projects that need water to soak away have to bring their own path in the form of washed stone and pipe.^[1]

Limon is rated well drained, and its hydrologic group is C, slow infiltration. Water does not stand in the profile for long, but a heavy rain arrives faster than the clay can take it in, so a good share runs off. On ground sloping only 0 to 2 percent, that runoff spreads out slowly and finds the low spots.^[1]

Underneath, the USGS state geologic map shows Modern alluvium at the center point, unconsolidated Quaternary sediment left by flowing water. Loose deposits like these vary from layer to layer, so one trench can turn up silt, sand and gravel in turn.^[2]

The ground surface at the center point sits 4,710 feet above sea level.^[3]

A dry, sunny station with hard freezes

Weather normals for ZIP 81001 come from the NOAA station at WFO Pueblo, CO, about 1 mile away. It averages just 13.8 inches of precipitation a year.^[4]

Sun and wind at the WFO Pueblo station pull moisture from soil quickly, so beds and lawns dry out between waterings faster than the low precipitation total alone suggests.^[4]

The low at WFO Pueblo drops to 32 F or below on 152 days in a normal year. Many of those freezes follow bright, warm afternoons, so the surface of a drive or a bed can freeze and thaw again and again.^[4]

The median last spring freeze at the station is April 30, and the median first fall freeze is October 9. Seed and sod do best when laid after the April date. Late summer and early fall work well for hardscape, before the October freezes start.^[4]

A dry climate and expansive clay make an awkward pair. Long dry spells shrink the clay and open cracks, and the next storm or a heavy watering swells it again. The goal on Limon ground is steady moisture, not a cycle of drought and soak.^[1],[4]

Keeping heavy clay at an even moisture

Around the house, grade the soil to fall away from the foundation and keep it that way. Beds that need daily watering belong a few feet out from the walls. Next to the foundation, a strip of River Rock or #57 Crushed Stone over fabric keeps mud and weeds down while needing no irrigation.^[1]

Downspouts should empty well away from the house. A buried line or a surface channel lined with Drain Rock carries roof water to a lower part of the yard, and a splash pad of River Rock under each outlet keeps the stream from digging a hole in the silty clay.^[1]

Tree roots draw water from clay too, and a large tree close to a house can dry the soil under one side of a slab. Plant new trees well away from foundations, and water established ones deeply at the drip line rather than at the trunk.^[1]

Patios and walks on this ground need a thicker base than on sandy soil. Dig out the topsoil, lay fabric, and compact Road Base in several thin lifts. The extra depth spreads the clay's movement and gives frost a dry layer to act on instead of wet clay.^[1],[4]

Millings or Driveway Gravel for a long lane

A long drive or a rural lane on silty clay loam often comes down to Asphalt Millings or Driveway Gravel on top. Millings, ground from old pavement, bind together in Pueblo's sun and form a dark, firm surface that sheds water and throws little dust. They resist washboarding and stay put on curves.^[1]

Driveway Gravel gives a lighter, classic finish and is easy to top up. On clay with slow infiltration, it needs a well-built base of Road Base or Crushed Concrete under it and a crown so water leaves quickly. Without that base, freeze and thaw work the clay up into the gravel and the surface turns soft each spring.^[1],[4]

Whichever top course goes on, woven fabric between the clay subgrade and the base is worth the effort. It keeps the fine soil from pumping up into the stone when the ground is wet.^[1]

The WFO Pueblo station logs 152 days a year with a low at or below 32 F, and compaction is what keeps either surface sound through them. A loose surface lets water in, and water in the clay below a drive is what turns a firm lane into ruts.^[4]

Gardens on heavy ground

Silty clay loam holds water and nutrients but packs hard. Mixing Compost into beds each year loosens the soil and helps roots spread. Raised beds of Garden Soil give vegetables a lighter root zone above the native clay.^[1]

Clay that dries hard in summer can still drown roots after a heavy watering, since water moves through it slowly. Water beds deeply and less often, and let the top inch dry before the next round.^[1]

Mulch saves water in a dry climate. Brown Shredded Mulch, Black Shredded Mulch and Red Mulch keep beds cool and moist through summer. Spread a fresh layer after the median last freeze of April 30 at the station.^[4]

Decomposed Granite, Walkway Gravel and Stone Dust Screenings make firm, dry paths across heavy soil. Pea Gravel suits play areas and borders, and Wood Chips cover larger beds and paths under trees.^[1]

Homes in ZIP 81001

ZIP 81001 is part of Pueblo County. The Census counts 13,868 housing units there, and 65 percent are detached single-family houses.^[5]

The median home in ZIP 81001 was built in 1969, and owners live in 55 percent of the occupied homes.^[5]

Citywide, Pueblo has 49,813 housing units, with detached houses at 72 percent. The city's median build year is 1965, slightly older than the ZIP's.^[5]

Detached houses make up most homes in both the ZIP and the city, so the usual orders run to driveways, side-yard parking pads, garden beds and lawn repair.^[5]

Colorado's transportation department sets Aggregate Base Course, Class 6, in Section 304 of the Standard Specifications for Road and Bridge Construction 2025 as the stone layer under state highways.^[6]