Gravel Delivery in Oregon

Silt runs through the soil readings for all five cities. The USDA soil survey reads silt loam, well drained, at the Portland center point. Salem's center point shows silt loam, poorly drained, and Gresham's silt loam, somewhat poorly drained. Hillsboro's center point reads silt loam, moderately well drained. Eugene stands apart with silty clay loam, well drained. Fine soils like these feel smooth between the fingers and hold a lot of water, which is good for gardens and hard on a gravel base.^[1]

Drainage class tells a buyer more than texture here. The same silt loam drains well at the Portland center point and poorly at the Salem center point. The difference comes from what lies below: a dense layer or a high water table keeps water from soaking down. Poorly drained ground stays wet for long stretches of the rainy season, so a base on it needs fabric, a coarse lower layer and a way for water to leave.^[1]

Silty clay loam, like the Eugene reading, carries more clay than the others. Clay swells when wet and shrinks as it dries in late summer, and it stays sticky for days after rain. Even with a well drained class, a driveway on clay loam needs a thicker base than one on sandy ground. Fabric keeps the clay from mixing up into the stone.^[1]

Most of the stone hauled in these cities is crushed from hard volcanic rock or dug from river gravel bars. Dark crushed rock breaks into sharp, dense pieces that lock tight in a base and resist wear. River gravel is rounded by water and comes washed in clean sizes. Screened and sorted, it becomes Pea Gravel, River Rock and Drain Rock. Crushed, the larger pieces turn into angular 3/4" Crushed Stone and Road Base.^[1]

The ground sits low. The Gresham center point stands 310 feet above sea level, and the Salem and Hillsboro center points each read 180 feet. The Oregon Department of Transportation writes its rules for the stone layer under state pavements in Dense-Graded Base Aggregate, Section 00641, of the Oregon Standard Specifications for Construction, dated 2024.^[2],[3]

Rain sets the schedule. The weather station used for Portland averages 44.1 inches of precipitation a year, the most on the list. Eugene's station reads 40.8 inches, Gresham's 40.7 inches and Salem's 40.1 inches. Hillsboro's station logs 35.9 inches, the driest reading of the five. Even there, a winter month with rain on most days is normal. Much of that falls as steady rain over many gray months rather than in a few big storms, so yards can stay soft for weeks at a stretch.^[4]

A soft lawn will rut under a loaded truck. On poorly drained silt, like the Salem center point reading, the surface may look firm while the soil a few inches down is saturated. Plan the drop on a paved driveway, a gravel pad or the street during the wet months. Dry summer weeks are the easiest time to bring a truck onto grass, and many buyers time big base jobs for those weeks. A short dry spell in spring or fall can also work if the subgrade has had a few days to drain.^[1]

Cold is mild. Hillsboro's station counts 64 days a year at 32 F or colder, Eugene's 52 days and Salem's 49 days. Gresham logs 28 days and Portland only 18 days. The Portland station averages 3.6 inches of snow a year. Snow and ice are rare enough that a winter delivery date is seldom lost to weather, but a hard freeze can still make a steep drive slick for a morning.^[4]

Access varies by neighborhood. Many older Portland streets have narrow lots, tall trees and wires close to the house, while newer subdivisions in Hillsboro and Gresham have wider drives. A dump truck needs room to back in and raise its bed. Gravel Valet can drop on a tarp so stone dust does not stain a concrete drive. Covering a pile of Topsoil or Garden Soil keeps rain from turning it to mud before it is spread.^[4]

Drainage leads the list. With 44.1 inches of precipitation a year at the Portland station, roof water, driveway runoff and soggy lawns are common problems. A French drain made of a fabric lined trench, perforated pipe and Drain Rock or #57 Crushed Stone moves water to a lower spot. On the somewhat poorly drained silt at the Gresham center point, a drain like this can dry a wet corner of the yard.^[1],[4]

Driveways and parking pads come next. On poorly drained silt, like the Salem reading, strip the topsoil, lay a woven fabric and start with a coarse layer of #4 Crushed Stone or 1-1/2" Crushed Gravel. Compact Road Base on top, then finish with 3/4" Crushed Stone or Driveway Gravel. Crown the surface and give it a ditch or a stone trench along the low edge. A drive built this way can stay firm through months of rain.^[1]

Muddy paths and garden walks are another common fix. Walkway Gravel or 3/8" Crushed Stone over a thin compacted base gives a firm path that does not puddle. Stone Dust Screenings pack smooth under a shed, a hot tub or a set of patio pavers. For a paver patio on the clay loam at the Eugene center point, a deeper base and edge drainage keep the pavers level.^[1]

Gardens thrive on this ground with a little help. Silt loam holds moisture and nutrients well, so many beds need only Compost and a top layer of mulch. Black Shredded Mulch, Brown Shredded Mulch or Wood Chips slow weeds and keep the soil from crusting after rain. Raised beds filled with Garden Soil drain better than the native ground on poorly drained lots like the Salem reading.^[1]

River Rock fits the look of the region. It lines rain gardens, dry creek beds and downspout splash areas, and it stays put where water runs. Pea Gravel makes a soft, quiet surface for a seating area. Fill Dirt raises a low spot that holds water, and Playground Sand suits a sandbox under a covered play area. Moss and algae can grow on shaded gravel in a damp climate. A path laid in full sun, or raked now and then, stays cleaner. Where tall firs drop needles onto a drive, a leaf blower clears them before they break down into a soft layer that holds water in the stone.^[4]