Order 3/4 Minus and Crushed Stone in Clackamas County, OR
Oregon Rock Supply delivers gravel, stone and aggregate delivery in Clackamas County, OR, and the season shapes most of it. Rain here falls almost entirely between November and March, so base and paving work concentrates in the dry months.
3/4 minus is the base most drives, parking pads and shed floors start from. Order it by the ton or the yard, size the load with the calculator on the product page, and pick a delivery date at checkout.
Materials Delivered in Clackamas County
Oregon names aggregate by top size. A minus notation means the material keeps its fines and compacts.
A clean or open notation means the fines are screened out and water moves through it.
Oregon specifies base material this way under the Oregon Standard Specifications for Construction. Section 02630.10 sets dense-graded base aggregate at 2 1/2 inch - 0 down to 3/4 inch - 0, and Section 00641.10 states that base aggregate is dense-graded unless otherwise specified.
3/4 minus is the standard Oregon base under a driveway, a parking pad, a shop floor or a shed base. It is crushed rock graded 3/4 inch down to fines so it compacts and locks up underfoot.
For drainage, drain rock and 3/4 clean are the washed, open materials. Riprap arms stream banks, culvert outlets and cut slopes, and Oregon specifies it by class from Class 50 up to Class 2000.
On the soil side, Garden Soil fills raised beds and vegetable plots where native silt or clay is too tight to plant into. Fill Dirt raises grade and backfills low ground before a base course goes on.
Choosing the Right Material
Multnomah County shares the same ground region as the valley and basin part of Clackamas County. Deep slackwater silt from the ice-age Missoula floods, Jory series clay in the foothills, and river gravel along the Willamette and its tributaries.
Yamhill County sits on that same ground. The base and drainage choice there follows the same reasoning: a compacting minus rock over tight silt, and a washed open stone where water has to move.
Marion County spans more than one zone, covering both the valley and basin ground and the Cascade and Hood River Valley ground. Clackamas County spans those same two zones, so the material split is the same on both sides.
Where the ground is tight silt and clay, a minus rock that compacts is the right base. Where the ground is pumice, cinders and ash over volcanic rock, water already moves, and the base still has to lock up.
Ground Conditions Across Clackamas County
This county spans two ground regions, and the two behave differently. In the Willamette Valley and Portland Basin, including Lake Oswego, Oregon City, West Linn and Happy Valley, the ground is deep slackwater silt over red clay and silty clay loam.
That silt and clay sheds water slowly. A thin base over it will rut and pump when the ground stays wet, so the base has to be built thick enough to bridge soft subgrade.
Rainfall runs 35 to 45 inches a year, almost all of it between November and March, with a seasonal high water table in the lowlands. That is why drainage layers matter as much as base depth.
In the Cascade Range and Hood River Valley, including Rhododendron, Government Camp, Brightwood and Welches, the ground is young volcanic: andesite and basalt with pumice, cinders and ash over it, and thin stony soil at elevation.
Winter precipitation and spring snowmelt run fast off steep volcanic slopes. Snowmelt and rain-on-snow scour culverts, shoulders and stream banks, which is where riprap and open stone go.
Portland treats October 1 to April 30 as the wet weather season and requires bare ground stabilized within two days, against seven days from May 1 to September 30. The Cascades run a shorter season, with snow and frozen ground stopping base work until late spring.
Delivery Across Clackamas County
Order online and choose a quantity by the ton or by the yard. Each product page has a calculator to size the load, and you pick a delivery date at checkout.
A dump truck tips the load on site in one pile. Have the drop area clear and reachable, with room for the truck to get in and out.
Delivery covers Lake Oswego, Oregon City, West Linn, Happy Valley, Wilsonville, Canby, Sandy, Gladstone, Damascus, Molalla, Estacada, Beavercreek, Mulino and Boring.
Order Gravel, Stone and Soil for Clackamas County
Start with the quantity. Each product page has a calculator, and you order by the ton or by the yard.
Once the numbers are set, pick your delivery date at checkout and Oregon Rock Supply sends a truck to your Clackamas County address.